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===========================================================================

This file contains the main features as well as overviews of specific
bug fixes (and other actions) for each version of Open MPI since
version 1.0.

As more fully described in the "Software Version Number" section in
the README file, Open MPI typically releases two separate version
series simultaneously.  Since these series have different goals and
are semi-independent of each other, a single NEWS-worthy item may be
introduced into different series at different times.  For example,
feature F was introduced in the vA.B series at version vA.B.C, and was
later introduced into the vX.Y series at vX.Y.Z.

The first time feature F is released, the item will be listed in the
vA.B.C section, denoted as:

   (** also to appear: X.Y.Z) -- indicating that this item is also
                                 likely to be included in future release
                                 version vX.Y.Z.

When vX.Y.Z is later released, the same NEWS-worthy item will also be
included in the vX.Y.Z section and be denoted as:

   (** also appeared: A.B.C)  -- indicating that this item was previously
                                 included in release version vA.B.C.

4.1.4 -- May, 2022
------------------

- Fix possible length integer overflow in numerous non-blocking collective
  operations.
- Fix segmentation fault in UCX if MPI Tool interface is finalized before
  MPI_Init is called.
- Remove /usr/bin/python dependency in configure.
- Fix OMPIO issue with long double etypes.
- Update treematch topology component to fix numerous correctness issues.
- Fix memory leak in UCX MCA parameter registration.
- Fix long operation closing file descriptors on non-Linux systems that
  can appear as a hang to users.
- Fix for attribute handling on GCC 11 due to pointer aliasing.
- Fix multithreaded race in UCX PML's datatype handling.
- Fix a correctness issue in CUDA Reduce algorithm.
- Fix compilation issue with CUDA GPUDirect RDMA support.
- Fix to make shmem_calloc(..., 0) conform to the OpenSHMEM specification.
- Add UCC collectives component.
- Fix divide by zero issue in OMPI IO component.
- Fix compile issue with libnl when not in standard search locations.


4.1.3 -- March, 2022
--------------------

- Fixed a seg fault in the smcuda BTL.  Thanks to Moritz Kreutzer and
  @Stadik for reporting the issue.
- Added support for ELEMENTAL to the MPI handle comparison functions
  in the mpi_f08 module.  Thanks to Salvatore Filippone for raising
  the issue.
- Minor datatype performance improvements in the CUDA-based code paths.
- Fix MPI_ALLTOALLV when used with MPI_IN_PLACE.
- Fix MPI_BOTTOM handling for non-blocking collectives.  Thanks to
  Lisandro Dalcin for reporting the problem.
- Enable OPAL memory hooks by default for UCX.
- Many compiler warnings fixes, particularly for newer versions of
  GCC.
- Fix intercommunicator overflow with large payload collectives.  Also
  fixed MPI_REDUCE_SCATTER_BLOCK for similar issues with large payload
  collectives.
- Back-port ROMIO 3.3 fix to use stat64() instead of stat() on GPFS.
- Fixed several non-blocking MPI collectives to not round fractions
  based on float precision.
- Fix compile failure for --enable-heterogeneous.  Also updated the
  README to clarify that --enable-heterogeneous is functional, but
  still not recomended for most environments.
- Minor fixes to OMPIO, including:
  - Fixing the open behavior of shared memory shared file pointers.
    Thanks to Axel Huebl for reporting the issue
  - Fixes to clean up lockfiles when closing files.  Thanks to Eric
    Chamberland for reporting the issue.
- Update LSF configure failure output to be more clear (e.g., on RHEL
  platforms).
- Update if_[in|ex]clude behavior in btl_tcp and oob_tcp to select
  *all* interfaces that fall within the specified subnet range.


4.1.2 -- November, 2021
-----------------------

- ROMIO portability fix for OpenBSD
- Fix handling of MPI_IN_PLACE with MPI_ALLTOALLW and improve performance
  of MPI_ALLTOALL and MPI_ALLTOALLV for MPI_IN_PLACE.
- Fix one-sided issue with empty groups in Post-Start-Wait-Complete
  synchronization mode.
- Fix Fortran status returns in certain use cases involving
  Generalized Requests
- Romio datatype bug fixes.
- Fix oshmem_shmem_finalize() when main() returns non-zero value.
- Fix wrong affinity under LSF with the membind option.
- Fix count==0 cases in MPI_REDUCE and MPI_IREDUCE.
- Fix ssh launching on Bourne-flavored shells when the user has "set
  -u" set in their shell startup files.
- Correctly process 0 slots with the mpirun --host option.
- Ensure to unlink and rebind socket when the Open MPI session
  directory already exists.
- Fix a segv in mpirun --disable-dissable-map.
- Fix a potential hang in the memory hook handling.
- Slight performance improvement in MPI_WAITALL when running in
  MPI_THREAD_MULTIPLE.
- Fix hcoll datatype mapping and rooted operation behavior.
- Correct some operations modifying MPI_Status.MPI_ERROR when it is
  disallowed by the MPI standard.
- UCX updates:
  - Fix datatype reference count issues.
  - Detach dynamic window memory when freeing a window.
  - Fix memory leak in datatype handling.
- Fix various atomic operations issues.
- mpirun: try to set the curses winsize to the pty of the spawned
  task.  Thanks to Stack Overflow user @Seriously for reporting the
  issue.
- PMIx updates:
  - Fix compatibility with external PMIx v4.x installations.
  - Fix handling of PMIx v3.x compiler/linker flags.  Thanks to Erik
    Schnetter for reporting the issue.
  - Skip SLURM-provided PMIx detection when appropriate.  Thanks to
    Alexander Grund for reporting the issue.
- Fix handling by C++ compilers when they #include the STL "<version>"
  header file, which ends up including Open MPI's text VERSION file
  (which is not C code).  Thanks to @srpgilles for reporting the
  issue.
- Fix MPI_Op support for MPI_LONG.
- Make the MPI C++ bindings library (libmpi_cxx) explicitly depend on
  the OPAL internal library (libopen-pal).  Thanks to Ye Luo for
  reporting the issue.
- Fix configure handling of "--with-libevent=/usr".
- Fix memory leak when opening Lustre files.  Thanks to Bert Wesarg
  for submitting the fix.
- Fix MPI_SENDRECV_REPLACE to correctly process datatype errors.
  Thanks to Lisandro Dalcin for reporting the issue.
- Fix MPI_SENDRECV_REPLACE to correctly handle large data.  Thanks
  Jakub Benda for reporting this issue and suggesting a fix.
- Add workaround for TCP "dropped connection" errors to drastically
  reduce the possibility of this happening.
- OMPIO updates:
  - Fix handling when AMODE is not set.  Thanks to Rainer Keller for
    reporting the issue and supplying the fix.
  - Fix FBTL "posix" component linking issue.  Thanks for Honggang Li
    for reporting the issue.
  - Fixed segv with MPI_FILE_GET_BYTE_OFFSET on 0-sized file view.
  - Thanks to GitHub user @shanedsnyder for submitting the issue.
- OFI updates:
  - Multi-plane / Multi-Nic nic selection cleanups
  - Add support for exporting Open MPI memory monitors into
    Libfabric.
  - Ensure that Cisco usNIC devices are never selected by the OFI
    MTL.
  - Fix buffer overflow in OFI networking setup.  Thanks to Alexander
    Grund for reporting the issue and supplying the fix.
- Fix SSEND on tag matching networks.
- Fix error handling in several MPI collectives.
- Fix the ordering of MPI_COMM_SPLIT_TYPE.  Thanks to Wolfgang
  Bangerth for raising the issue.
- No longer install the orted-mpir library (it's an internal / Libtool
  convenience library).  Thanks to Andrew Hesford for the fix.
- PSM2 updates:
  - Allow advanced users to disable PSM2 version checking.
  - Fix to allow non-default installation locations of psm2.h.


4.1.1 -- April, 2021
--------------------

- Fix a number of datatype issues, including an issue with
  improper handling of partial datatypes that could lead to
  an unexpected application failure.
- Change UCX PML to not warn about MPI_Request leaks during
  MPI_FINALIZE by default.  The old behavior can be restored with
  the mca_pml_ucx_request_leak_check MCA parameter.
- Reverted temporary solution that worked around launch issues in
  SLURM v20.11.{0,1,2}. SchedMD encourages users to avoid these
  versions and to upgrade to v20.11.3 or newer.
- Updated PMIx to v3.2.2.
- Fixed configuration issue on Apple Silicon observed with
  Homebrew. Thanks to François-Xavier Coudert for reporting the issue.
- Disabled gcc built-in atomics by default on aarch64 platforms.
- Disabled UCX PML when UCX v1.8.0 is detected. UCX version 1.8.0 has a bug that
  may cause data corruption when its TCP transport is used in conjunction with
  the shared memory transport. UCX versions prior to v1.8.0 are not affected by
  this issue. Thanks to @ksiazekm for reporting the issue.
- Fixed detection of available UCX transports/devices to better inform PML
  prioritization.
- Fixed SLURM support to mark ORTE daemons as non-MPI tasks.
- Improved AVX detection to more accurately detect supported
  platforms.  Also improved the generated AVX code, and switched to
  using word-based MCA params for the op/avx component (vs. numeric
  big flags).
- Improved OFI compatibility support and fixed memory leaks in error
  handling paths.
- Improved HAN collectives with support for Barrier and Scatter. Thanks
  to @EmmanuelBRELLE for these changes and the relevant bug fixes.
- Fixed MPI debugger support (i.e., the MPIR_Breakpoint() symbol).
  Thanks to @louisespellacy-arm for reporting the issue.
- Fixed ORTE bug that prevented debuggers from reading MPIR_Proctable.
- Removed PML uniformity check from the UCX PML to address performance
  regression.
- Fixed MPI_Init_thread(3) statement about C++ binding and update
  references about MPI_THREAD_MULTIPLE.  Thanks to Andreas Lösel for
  bringing the outdated docs to our attention.
- Added fence_nb to Flux PMIx support to address segmentation faults.
- Ensured progress of AIO requests in the POSIX FBTL component to
  prevent exceeding maximum number of pending requests on MacOS.
- Used OPAL's mutli-thread support in the orted to leverage atomic
  operations for object refcounting.
- Fixed segv when launching with static TCP ports.
- Fixed --debug-daemons mpirun CLI option.
- Fixed bug where mpirun did not honor --host in a managed job
  allocation.
- Made a managed allocation filter a hostfile/hostlist.
- Fixed bug to marked a generalized request as pending once initiated.
- Fixed external PMIx v4.x check.
- Fixed OSHMEM build with `--enable-mem-debug`.
- Fixed a performance regression observed with older versions of GCC when
  __ATOMIC_SEQ_CST is used. Thanks to @BiplabRaut for reporting the issue.
- Fixed buffer allocation bug in the binomial tree scatter algorithm when
  non-contiguous datatypes are used. Thanks to @sadcat11 for reporting the issue.
- Fixed bugs related to the accumulate and atomics functionality in the
  osc/rdma component.
- Fixed race condition in MPI group operations observed with
  MPI_THREAD_MULTIPLE threading level.
- Fixed a deadlock in the TCP BTL's connection matching logic.
- Fixed pml/ob1 compilation error when CUDA support is enabled.
- Fixed a build issue with Lustre caused by unnecessary header includes.
- Fixed a build issue with IMB LSF workload manager.
- Fixed linker error with UCX SPML.


4.1.0 -- December, 2020
-----------------------

- collectives: Add HAN and ADAPT adaptive collectives components.
  Both components are off by default and can be enabled by specifying
  "mpirun --mca coll_adapt_priority 100 --mca coll_han_priority 100 ...".
  We intend to enable both by default in Open MPI 5.0.
- OMPIO is now the default for MPI-IO on all filesystems, including
  Lustre (prior to this, ROMIO was the default for Lustre).  Many
  thanks to Mark Dixon for identifying MPI I/O issues and providing
  access to Lustre systems for testing.
- Updates for macOS Big Sur.  Thanks to FX Coudert for reporting this
  issue and pointing to a solution.
- Minor MPI one-sided RDMA performance improvements.
- Fix hcoll MPI_SCATTERV with MPI_IN_PLACE.
- Add AVX support for MPI collectives.
- Updates to mpirun(1) about "slots" and PE=x values.
- Fix buffer allocation for large environment variables.  Thanks to
  @zrss for reporting the issue.
- Upgrade the embedded OpenPMIx to v3.2.2.
- Take more steps towards creating fully Reproducible builds (see
  https://reproducible-builds.org/).  Thanks Bernhard M. Wiedemann for
  bringing this to our attention.
- Fix issue with extra-long values in MCA files.  Thanks to GitHub
  user @zrss for bringing the issue to our attention.
- UCX: Fix zero-sized datatype transfers.
- Fix --cpu-list for non-uniform modes.
- Fix issue in PMIx callback caused by missing memory barrier on Arm platforms.
- OFI MTL: Various bug fixes.
- Fixed issue where MPI_TYPE_CREATE_RESIZED would create a datatype
  with unexpected extent on oddly-aligned datatypes.
- collectives: Adjust default tuning thresholds for many collective
  algorithms
- runtime: fix situation where rank-by argument does not work
- Portals4: Clean up error handling corner cases
- runtime: Remove --enable-install-libpmix option, which has not
  worked since it was added
- opal: Disable memory patcher component on MacOS
- UCX: Allow UCX 1.8 to be used with the btl uct
- UCX: Replace usage of the deprecated NB API of UCX with NBX
- OMPIO: Add support for the IME file system
- OFI/libfabric: Added support for multiple NICs
- OFI/libfabric: Added support for Scalable Endpoints
- OFI/libfabric: Added btl for one-sided support
- OFI/libfabric: Multiple small bugfixes
- libnbc: Adding numerous performance-improving algorithms

4.0.7 -- November, 2021
-----------------------

- Fix an issue with MPI_IALLREDUCE_SCATTER when using large count
  arguments.
- Fixed an issue with POST/START/COMPLETE/WAIT when using subsets
  of processes.  Thanks to Thomas Gilles for reporting.
- Numerous fixes from vendor partners.
- Fix a problem with a couple of MPI_IALLREDUCE algorithms.  Thanks to
  John Donners for reporting.
- Fix an edge case where MPI_Reduce is invoked with zero count and NULL
  source and destination buffers.
- Use the mfence instruction in opal_atomic_rmb on x86_64 cpus.  Thanks
  to George Katevenis for proposing a fix.
- Fix an issue with the Open MPI build system using the SLURM provided
  PMIx when not requested by the user.  Thanks to Alexander Grund for
  reporting.
- Fix a problem compiling Open MPI with clang on case-insensitive
  file systems.  Thanks to @srpgilles for reporting.
- Fix some OFI usNIC/OFI MTL interaction problems.  Thanks to
  @roguephysicist reporting this issue.
- Fix a problem with the Posix fbtl component failing to load.
  Thanks to Honggang Li for reporting.

4.0.6 -- June, 2021
-------------------

- Update embedded PMIx to 3.2.3.  This update addresses several
  MPI_COMM_SPAWN problems.
- Fix an issue with MPI_FILE_GET_BYTE_OFFSET when supplying a
  zero size file view.  Thanks to @shanedsnyder for reporting.
- Fix an issue with MPI_COMM_SPLIT_TYPE not observing key correctly.
  Thanks to Wolfgang Bangerth for reporting.
- Fix a derived datatype issue that could lead to potential data
  corruption when using UCX.  Thanks to @jayeshkrishna for reporting.
- Fix a problem with shared memory transport file name collisions.
  Thanks to Moritz Kreutzer for reporting.
- Fix a problem when using Flux PMI and UCX.  Thanks to Sami Ilvonen
  for reporting and supplying a fix.
- Fix a problem with MPIR breakpoint being compiled out using PGI
  compilers.  Thanks to @louisespellacy-arm for reporting.
- Fix some ROMIO issues when using Lustre.  Thanks to Mark Dixon for
  reporting.
- Fix a problem using an external PMIx 4 to build Open MPI 4.0.x.
- Fix a compile problem when using the enable-timing configure option
  and UCX.  Thanks to Jan Bierbaum for reporting.
- Fix a symbol name collision when using the Cray compiler to build
  Open SHMEM.  Thanks to Pak Lui for reporting and fixing.
- Correct an issue encountered when building Open MPI under OSX Big Sur.
  Thanks to FX Coudert for reporting.
- Various fixes to the OFI MTL.
- Fix an issue with allocation of sufficient memory for parsing long
  environment variable values.  Thanks to @zrss for reporting.
- Improve reproducibility of builds to assist Open MPI packages.
  Thanks to Bernhard Wiedmann for bringing this to our attention.

4.0.5 -- August, 2020
---------------------

- Fix a problem with MPI RMA compare and swap operations.  Thanks
  to Wojciech Chlapek for reporting.
- Disable binding of MPI processes to system resources by Open MPI
  if an application is launched using SLURM's srun command.
- Disable building of the Fortran mpi_f08 module when configuring
  Open MPI with default 8 byte Fortran integer size.  Thanks to
  @ahcien for reporting.
- Fix a problem with mpirun when the --map-by option is used.
  Thanks to Wenbin Lyu for reporting.
- Fix some issues with MPI one-sided operations uncovered using Global
  Arrays regression test-suite.  Thanks to @bjpalmer for reporting.
- Fix a problem with make check when using the PGI compiler.  Thanks to
  Carl Ponder for reporting.
- Fix a problem with MPI_FILE_READ_AT_ALL that could lead to application
  hangs under certain circumstances.  Thanks to Scot Breitenfeld for
  reporting.
- Fix a problem building C++ applications with newer versions of GCC.
  Thanks to Constantine Khrulev for reporting.

4.0.4 -- June, 2020
-----------------------

- Fix a memory patcher issue intercepting shmat and shmdt.  This was
  observed on RHEL 8.x ppc64le (see README for more info).
- Fix an illegal access issue caught using gcc's address sanitizer.
  Thanks to  Georg Geiser for reporting.
- Add checks to avoid conflicts with a libevent library shipped with LSF.
- Switch to linking against libevent_core rather than libevent, if present.
- Add improved support for UCX 1.9 and later.
- Fix an ABI compatibility issue with the Fortran 2008 bindings.
  Thanks to Alastair McKinstry for reporting.
- Fix an issue with rpath of /usr/lib64 when building OMPI on
  systems with Lustre.  Thanks to David Shrader for reporting.
- Fix a memory leak occurring with certain MPI RMA operations.
- Fix an issue with ORTE's mapping of MPI processes to resources.
  Thanks to Alex Margolin for reporting and providing a fix.
- Correct a problem with incorrect error codes being returned
  by OMPI MPI_T functions.
- Fix an issue with debugger tools not being able to attach
  to mpirun more than once.  Thanks to Gregory Lee for reporting.
- Fix an issue with the Fortran compiler wrappers when using
  NAG compilers.  Thanks to Peter Brady for reporting.
- Fix an issue with the ORTE ssh based process launcher at scale.
  Thanks to Benjamín Hernández for reporting.
- Address an issue when using shared MPI I/O operations.  OMPIO will
  now successfully return from the file open statement but will
  raise an error if the file system does not supported shared I/O
  operations.  Thanks to Romain Hild for reporting.
- Fix an issue with MPI_WIN_DETACH.  Thanks to Thomas Naughton for reporting.

4.0.3 -- March, 2020
-----------------------

- Update embedded PMIx to 3.1.5
- Add support for Mellanox ConnectX-6.
- Fix an issue in OpenMPI IO when using shared file pointers.
  Thanks to Romain Hild for reporting.
- Fix a problem with Open MPI using a previously installed
  Fortran mpi module during compilation.  Thanks to Marcin
  Mielniczuk for reporting
- Fix a problem with Fortran compiler wrappers ignoring use of
  disable-wrapper-runpath configure option.  Thanks to David
  Shrader for reporting.
- Fixed an issue with trying to use mpirun on systems where neither
  ssh nor rsh is installed.
- Address some problems found when using XPMEM for intra-node message
  transport.
- Improve dimensions returned by MPI_Dims_create for certain
  cases.  Thanks to @aw32 for reporting.
- Fix an issue when sending messages larger than 4GB. Thanks to
  Philip Salzmann for reporting this issue.
- Add ability to specify alternative module file path using
  Open MPI's RPM spec file.  Thanks to @jschwartz-cray for reporting.
- Clarify use of --with-hwloc configuration option in the README.
  Thanks to Marcin Mielniczuk for raising this documentation issue.
- Fix an issue with shmem_atomic_set.  Thanks to Sameh Sharkawi for reporting.
- Fix a problem with MPI_Neighbor_alltoall(v,w) for cartesian communicators
  with cyclic boundary conditions.  Thanks to Ralph Rabenseifner and
  Tony Skjellum for reporting.
- Fix an issue using Open MPIO on 32 bit systems.  Thanks to
  Orion Poplawski for reporting.
- Fix an issue with NetCDF test deadlocking when using the vulcan
  Open MPIO component.  Thanks to Orion Poplawski for reporting.
- Fix an issue with the mpi_yield_when_idle parameter being ignored
  when set in the Open MPI MCA parameter configuration file.
  Thanks to @iassiour for reporting.
- Address an issue with Open MPIO when writing/reading more than 2GB
  in an operation.  Thanks to Richard Warren for reporting.

4.0.2 -- September, 2019
------------------------

- Update embedded PMIx to 3.1.4
- Enhance Open MPI to detect when processes are running in
  different name spaces on the same node, in which case the
  vader CMA single copy mechanism is disabled.  Thanks
  to Adrian Reber for reporting and providing a fix.
- Fix an issue with ORTE job tree launch mechanism.  Thanks
  to @lanyangyang for reporting.
- Fix an issue with env processing when running as root.
  Thanks to Simon Byrne for reporting and providing a fix.
- Fix Fortran MPI_FILE_GET_POSITION return code bug.
  Thanks to Wei-Keng Liao for reporting.
- Fix user defined datatypes/ops leak in nonblocking base collective
  component.  Thanks to Andrey Maslennikov for verifying fix.
- Fixed shared memory not working with spawned processes.
  Thanks to @rodarima for reporting.
- Fix data corruption of overlapping datatypes on sends.
  Thanks to DKRZ for reporting.
- Fix segfault in oob_tcp component on close with active listeners.
  Thanks to Orivej Desh for reporting and providing a fix.
- Fix divide by zero segfault in ompio.
  Thanks to @haraldkl for reporting and providing a fix.
- Fix finalize of flux compnents.
  Thanks to Stephen Herbein and Jim Garlick for providing a fix.
- Fix osc_rdma_acc_single_intrinsic regression.
  Thanks to Joseph Schuchart for reporting and providing a fix.
- Fix hostnames with large integers.
  Thanks to @perrynzhou for reporting and providing a fix.
- Fix Deadlock in MPI_Fetch_and_op when using UCX
  Thanks to Joseph Schuchart for reporting.
- Fix the SLURM plm for mpirun-based launching.
  Thanks to Jordon Hayes for reporting and providing a fix.
- Prevent grep failure in rpmbuild from aborting.
  Thanks to Daniel Letai for reporting.
- Fix btl/vader finalize sequence.
  Thanks to Daniel Vollmer for reporting.
- Fix pml/ob1 local handle sent during PUT control message.
  Thanks to @EmmanuelBRELLE for reporting and providing a fix.
- Fix Memory leak with persistent MPI sends and the ob1 "get" protocol.
  Thanks to @s-kuberski for reporting.
- v4.0.x: mpi: mark MPI_COMBINER_{HVECTOR,HINDEXED,STRUCT}_INTEGER
  removed unless configured with --enable-mpi1-compatibility
- Fix make-authors.pl when run in a git submodule.
  Thanks to Michael Heinz for reporting and providing a fix.
- Fix deadlock with mpi_assert_allow_overtaking in MPI_Issend.
  Thanks to Joseph Schuchart and George Bosilca for reporting.
- Add compilation flag to allow unwinding through files that are
  present in the stack when attaching with MPIR.
  Thanks to James A Clark for reporting and providing a fix.

Known issues:

- There is a known issue with the OFI libfabric and PSM2 MTLs when trying to send
  very long (> 4 GBytes) messages.  In this release, these MTLs will catch
  this case and abort the transfer.  A future release will provide a
  better solution to this issue.

4.0.1 -- March, 2019
--------------------

- Update embedded PMIx to 3.1.2.
- Fix an issue with Vader (shared-memory) transport on OS-X. Thanks
  to Daniel Vollmer for reporting.
- Fix a problem with the usNIC BTL Makefile.  Thanks to George Marselis
  for reporting.
- Fix an issue when using --enable-visibility configure option
  and older versions of hwloc.  Thanks to Ben Menadue for reporting
  and providing a fix.
- Fix an issue with MPI_WIN_CREATE_DYNAMIC and MPI_GET from self.
  Thanks to Bart Janssens for reporting.
- Fix an issue of excessive compiler warning messages from mpi.h
  when using newer C++ compilers.  Thanks to @Shadow-fax for
  reporting.
- Fix a problem when building Open MPI using clang 5.0.
- Fix a problem with MPI_WIN_CREATE when using UCX.  Thanks
  to Adam Simpson for reporting.
- Fix a memory leak encountered for certain MPI datatype
  destructor operations.  Thanks to Axel Huebl for reporting.
- Fix several problems with MPI RMA accumulate operations.
  Thanks to Jeff Hammond for reporting.
- Fix possible race condition in closing some file descriptors
  during job launch using mpirun.  Thanks to Jason Williams
  for reporting and providing a fix.
- Fix a problem in OMPIO for large individual write operations.
  Thanks to Axel Huebl for reporting.
- Fix a problem with parsing of map-by ppr options to mpirun.
  Thanks to David Rich for reporting.
- Fix a problem observed when using the mpool hugepage component.  Thanks
  to Hunter Easterday for reporting and fixing.
- Fix valgrind warning generated when invoking certain MPI Fortran
  data type creation functions.  Thanks to @rtoijala for reporting.
- Fix a problem when trying to build with a PMIX 3.1 or newer
  release.  Thanks to Alastair McKinstry for reporting.
- Fix a problem encountered with building MPI F08 module files.
  Thanks to Igor Andriyash and Axel Huebl for reporting.
- Fix two memory leaks encountered for certain MPI-RMA usage patterns.
  Thanks to Joseph Schuchart for reporting and fixing.
- Fix a problem with the ORTE rmaps_base_oversubscribe MCA paramater.
  Thanks to @iassiour for reporting.
- Fix a problem with UCX PML default error handler for MPI communicators.
  Thanks to Marcin Krotkiewski for reporting.
- Fix various issues with OMPIO uncovered by the testmpio test suite.

4.0.0 -- September, 2018
------------------------

- OSHMEM updated to the OpenSHMEM 1.4 API.
- Do not build OpenSHMEM layer when there are no SPMLs available.
  Currently, this means the OpenSHMEM layer will only build if
  a MXM or UCX library is found.
- A UCX BTL was added for enhanced MPI RMA support using UCX
- With this release,  OpenIB BTL now only supports iWarp and RoCE by default.
- Updated internal HWLOC to 2.0.2
- Updated internal PMIx to 3.0.2
- Change the priority for selecting external verses internal HWLOC
  and PMIx packages to build.  Starting with this release, configure
  by default selects available external HWLOC and PMIx packages over
  the internal ones.
- Updated internal ROMIO to 3.2.1.
- Removed support for the MXM MTL.
- Removed support for SCIF.
- Improved CUDA support when using UCX.
- Enable use of CUDA allocated buffers for OMPIO.
- Improved support for two phase MPI I/O operations when using OMPIO.
- Added support for Software-based Performance Counters, see
  https://github.com/davideberius/ompi/wiki/How-to-Use-Software-Based-Performance-Counters-(SPCs)-in-Open-MPI
- Change MTL OFI from opting-IN on "psm,psm2,gni" to opting-OUT on
  "shm,sockets,tcp,udp,rstream"
- Various improvements to MPI RMA performance when using RDMA
  capable interconnects.
- Update memkind component to use the memkind 1.6 public API.
- Fix a problem with javadoc builds using OpenJDK 11.  Thanks to
  Siegmar Gross for reporting.
- Fix a memory leak using UCX.  Thanks to Charles Taylor for reporting.
- Fix hangs in MPI_FINALIZE when using UCX.
- Fix a problem with building Open MPI using an external PMIx 2.1.2
  library.  Thanks to Marcin Krotkiewski for reporting.
- Fix race conditions in Vader (shared memory) transport.
- Fix problems with use of newer map-by mpirun options.  Thanks to
  Tony Reina for reporting.
- Fix rank-by algorithms to properly rank by object and span
- Allow for running as root of two environment variables are set.
  Requested by Axel Huebl.
- Fix a problem with building the Java bindings when using Java 10.
  Thanks to Bryce Glover for reporting.
- Fix a problem with ORTE not reporting error messages if an application
  terminated normally but exited with non-zero error code.  Thanks to
  Emre Brookes for reporting.

3.1.6 -- March, 2020
--------------------

- Fix one-sided shared memory window configuration bug.
- Fix support for PGI'18 compiler.
- Fix issue with zero-length blockLength in MPI_TYPE_INDEXED.
- Fix run-time linker issues with OMPIO on newer Linux distros.
- Fix PMIX dstore locking compilation issue.  Thanks to Marco Atzeri
  for reporting the issue.
- Allow the user to override modulefile_path in the Open MPI SRPM,
  even if install_in_opt is set to 1.
- Properly detect ConnectX-6 HCAs in the openib BTL.
- Fix segfault in the MTL/OFI initialization for large jobs.
- Fix issue to guarantee to properly release MPI one-sided lock when
  using UCX transports to avoid a deadlock.
- Fix potential deadlock when processing outstanding transfers with
  uGNI transports.
- Fix various portals4 control flow bugs.
- Fix communications ordering for alltoall and Cartesian neighborhood
  collectives.
- Fix an infinite recursion crash in the memory patcher on systems
  with glibc v2.26 or later (e.g., Ubuntu 18.04) when using certain
  OS-bypass interconnects.

3.1.5 -- November, 2019
-----------------------

- Fix OMPIO issue limiting file reads/writes to 2GB.  Thanks to
  Richard Warren for reporting the issue.
- At run time, automatically disable Linux cross-memory attach (CMA)
  for vader BTL (shared memory) copies when running in user namespaces
  (i.e., containers).  Many thanks to Adrian Reber for raising the
  issue and providing the fix.
- Sending very large MPI messages using the ofi MTL will fail with
  some of the underlying Libfabric transports (e.g., PSM2 with
  messages >=4GB, verbs with messages >=2GB).  Prior version of Open
  MPI failed silently; this version of Open MPI invokes the
  appropriate MPI error handler upon failure.  See
  https://github.com/open-mpi/ompi/issues/7058 for more details.
  Thanks to Emmanuel Thomé for raising the issue.
- Fix case where 0-extent datatypes might be eliminated during
  optimization.  Thanks to Github user @tjahns for raising the issue.
- Ensure that the MPIR_Breakpoint symbol is not optimized out on
  problematic platforms.
- Fix MPI one-sided 32 bit atomic support.
- Fix OMPIO offset calculations with SEEK_END and SEEK_CUR in
  MPI_FILE_GET_POSITION.  Thanks to Wei-keng Liao for raising the
  issue.
- Add "naive" regx component that will never fail, no matter how
  esoteric the hostnames are.
- Fix corner case for datatype extent computations.  Thanks to David
  Dickenson for raising the issue.
- Allow individual jobs to set their map/rank/bind policies when
  running LSF.  Thanks to Nick R. Papior for assistance in solving the
  issue.
- Fix MPI buffered sends with the "cm" PML.
- Properly propagate errors to avoid deadlocks in MPI one-sided operations.
- Update to PMIx v2.2.3.
- Fix data corruption in non-contiguous MPI accumulates over UCX.
- Fix ssh-based tree-based spawning at scale.  Many thanks to Github
  user @zrss for the report and diagnosis.
- Fix the Open MPI RPM spec file to not abort when grep fails.  Thanks
  to Daniel Letai for bringing this to our attention.
- Handle new SLURM CLI options (SLURM 19 deprecated some options that
  Open MPI was using).  Thanks to Jordan Hayes for the report and the
  initial fix.
- OMPI: fix division by zero with an empty file view.
- Also handle shmat()/shmdt() memory patching with OS-bypass networks.
- Add support for unwinding info to all files that are present in the
  stack starting from MPI_Init, which is helpful with parallel
  debuggers.  Thanks to James Clark for the report and initial fix.
- Fixed inadvertant use of bitwise operators in the MPI C++ bindings
  header files.  Thanks to Bert Wesarg for the report and the fix.

3.1.4 -- April, 2019
--------------------

- Fix compile error when configured with --enable-mpi-java and
  --with-devel-headers.  Thanks to @g-raffy for reporting the issue
  (** also appeared: v3.0.4).
- Only use hugepages with appropriate permissions.  Thanks to Hunter
  Easterday for the fix.
- Fix possible floating point rounding and division issues in OMPIO
  which led to crashes and/or data corruption with very large data.
  Thanks to Axel Huebl and René Widera for identifing the issue,
  supplying and testing the fix (** also appeared: v3.0.4).
- Use static_cast<> in mpi.h where appropriate.  Thanks to @shadow-fx
  for identifying the issue (** also appeared: v3.0.4).
- Fix RMA accumulate of non-predefined datatypes with predefined
  operators.  Thanks to Jeff Hammond for raising the issue (** also
  appeared: v3.0.4).
- Fix race condition when closing open file descriptors when launching
  MPI processes.  Thanks to Jason Williams for identifying the issue and
  supplying the fix (** also appeared: v3.0.4).
- Fix support for external PMIx v3.1.x.
- Fix Valgrind warnings for some MPI_TYPE_CREATE_* functions.  Thanks
  to Risto Toijala for identifying the issue and supplying the fix (**
  also appeared: v3.0.4).
- Fix MPI_TYPE_CREATE_F90_{REAL,COMPLEX} for r=38 and r=308 (** also
  appeared: v3.0.4).
- Fix assembly issues with old versions of gcc (<6.0.0) that affected
  the stability of shared memory communications (e.g., with the vader
  BTL) (** also appeared: v3.0.4).
- Fix MPI_Allreduce crashes with some cases in the coll/spacc module.
- Fix the OFI MTL handling of MPI_ANY_SOURCE (** also appeared:
  v3.0.4).
- Fix noisy errors in the openib BTL with regards to
  ibv_exp_query_device().  Thanks to Angel Beltre and others who
  reported the issue (** also appeared: v3.0.4).
- Fix zero-size MPI one-sided windows with UCX.

3.1.3 -- October, 2018
----------------------

- Fix race condition in MPI_THREAD_MULTIPLE support of non-blocking
  send/receive path.
- Fix error handling SIGCHLD forwarding.
- Add support for CHARACTER and LOGICAL Fortran datatypes for MPI_SIZEOF.
- Fix compile error when using OpenJDK 11 to compile the Java bindings.
- Fix crash when using a hostfile with a 'user@host' line.
- Numerous Fortran '08 interface fixes.
- TCP BTL error message fixes.
- OFI MTL now will use any provider other than shm, sockets, tcp, udp, or
  rstream, rather than only supporting gni, psm, and psm2.
- Disable async receive of CUDA buffers by default, fixing a hang
  on large transfers.
- Support the BCM57XXX and BCM58XXX Broadcomm adapters.
- Fix minmax datatype support in ROMIO.
- Bug fixes in vader shared memory transport.
- Support very large buffers with MPI_TYPE_VECTOR.
- Fix hang when launching with mpirun on Cray systems.

3.1.2 -- August, 2018
------------------------

- A subtle race condition bug was discovered in the "vader" BTL
  (shared memory communications) that, in rare instances, can cause
  MPI processes to crash or incorrectly classify (or effectively drop)
  an MPI message sent via shared memory.  If you are using the "ob1"
  PML with "vader" for shared memory communication (note that vader is
  the default for shared memory communication with ob1), you need to
  upgrade to v3.1.2 or later to fix this issue.  You may also upgrade
  to the following versions to fix this issue:
  - Open MPI v2.1.5 (expected end of August, 2018) or later in the
    v2.1.x series
  - Open MPI v3.0.1 (released March, 2018) or later in the v3.0.x
    series
- Assorted Portals 4.0 bug fixes.
- Fix for possible data corruption in MPI_BSEND.
- Move shared memory file for vader btl into /dev/shm on Linux.
- Fix for MPI_ISCATTER/MPI_ISCATTERV Fortran interfaces with MPI_IN_PLACE.
- Upgrade PMIx to v2.1.3.
- Numerous One-sided bug fixes.
- Fix for race condition in uGNI BTL.
- Improve handling of large number of interfaces with TCP BTL.
- Numerous UCX bug fixes.

3.1.1 -- June, 2018
-------------------

- Fix potential hang in UCX PML during MPI_FINALIZE
- Update internal PMIx to v2.1.2rc2 to fix forward version compatibility.
- Add new MCA parameter osc_sm_backing_store to allow users to specify
  where in the filesystem the backing file for the shared memory
  one-sided component should live.  Defaults to /dev/shm on Linux.
- Fix potential hang on non-x86 platforms when using builds with
  optimization flags turned off.
- Disable osc/pt2pt when using MPI_THREAD_MULTIPLE due to numerous
  race conditions in the component.
- Fix dummy variable names for the mpi and mpi_f08 Fortran bindings to
  match the MPI standard.  This may break applications which use
  name-based parameters in Fortran which used our internal names
  rather than those documented in the MPI standard.
- Revamp Java detection to properly handle new Java versions which do
  not provide a javah wrapper.
- Fix RMA function signatures for use-mpi-f08 bindings to have the
  asynchonous property on all buffers.
- Improved configure logic for finding the UCX library.

3.1.0 -- May, 2018
------------------

- Various OpenSHMEM bug fixes.
- Properly handle array_of_commands argument to Fortran version of
  MPI_COMM_SPAWN_MULTIPLE.
- Fix bug with MODE_SEQUENTIAL and the sharedfp MPI-IO component.
- Use "javac -h" instead of "javah" when building the Java bindings
  with a recent version of Java.
- Fix mis-handling of jostepid under SLURM that could cause problems
  with PathScale/OmniPath NICs.
- Disable the POWER 7/BE block in configure.  Note that POWER 7/BE is
  still not a supported platform, but it is no longer automatically
  disabled.  See
  https://github.com/open-mpi/ompi/issues/4349#issuecomment-374970982
  for more information.
- The output-filename option for mpirun is now converted to an
  absolute path before being passed to other nodes.
- Add monitoring component for PML, OSC, and COLL to track data
  movement of MPI applications.  See
  ompi/mca/commmon/monitoring/HowTo_pml_monitoring.tex for more
  information about the monitoring framework.
- Add support for communicator assertions: mpi_assert_no_any_tag,
  mpi_assert_no_any_source, mpi_assert_exact_length, and
  mpi_assert_allow_overtaking.
- Update PMIx to version 2.1.1.
- Update hwloc to 1.11.7.
- Many one-sided behavior fixes.
- Improved performance for Reduce and Allreduce using Rabenseifner's algorithm.
- Revamped mpirun --help output to make it a bit more manageable.
- Portals4 MTL improvements: Fix race condition in rendezvous protocol and
  retry logic.
- UCX OSC: initial implementation.
- UCX PML improvements: add multi-threading support.
- Yalla PML improvements: Fix error with irregular contiguous datatypes.
- Openib BTL: disable XRC support by default.
- TCP BTL: Add check to detect and ignore connections from processes
  that aren't MPI (such as IDS probes) and verify that source and
  destination are using the same version of Open MPI, fix issue with very
  large message transfer.
- ompi_info parsable output now escapes double quotes in values, and
  also quotes values can contains colons.  Thanks to Lev Givon for the
  suggestion.
- CUDA-aware support can now handle GPUs within a node that do not
  support CUDA IPC.  Earlier versions would get error and abort.
- Add a mca parameter ras_base_launch_orted_on_hn to allow for launching
  MPI processes on the same node where mpirun is executing using a separate
  orte daemon, rather than the mpirun process.   This may be useful to set to
  true when using SLURM, as it improves interoperability with SLURM's signal
  propagation tools.  By default it is set to false, except for Cray XC systems.
- Remove LoadLeveler RAS support.
- Remove IB XRC support from the OpenIB BTL due to lack of support.
- Add functionality for IBM s390 platforms.  Note that regular
  regression testing does not occur on the s390 and it is not
  considered a supported platform.
- Remove support for big endian PowerPC.
- Remove support for XL compilers older than v13.1.
- Remove support for atomic operations using MacOS atomics library.

3.0.6 -- March, 2020
--------------------

- Fix one-sided shared memory window configuration bug.
- Fix support for PGI'18 compiler.
- Fix run-time linker issues with OMPIO on newer Linux distros.
- Allow the user to override modulefile_path in the Open MPI SRPM,
  even if install_in_opt is set to 1.
- Properly detect ConnectX-6 HCAs in the openib BTL.
- Fix segfault in the MTL/OFI initialization for large jobs.
- Fix various portals4 control flow bugs.
- Fix communications ordering for alltoall and Cartesian neighborhood
  collectives.
- Fix an infinite recursion crash in the memory patcher on systems
  with glibc v2.26 or later (e.g., Ubuntu 18.04) when using certain
  OS-bypass interconnects.

3.0.5 -- November, 2019
-----------------------

- Fix OMPIO issue limiting file reads/writes to 2GB.  Thanks to
  Richard Warren for reporting the issue.
- At run time, automatically disable Linux cross-memory attach (CMA)
  for vader BTL (shared memory) copies when running in user namespaces
  (i.e., containers).  Many thanks to Adrian Reber for raising the
  issue and providing the fix.
- Sending very large MPI messages using the ofi MTL will fail with
  some of the underlying Libfabric transports (e.g., PSM2 with
  messages >=4GB, verbs with messages >=2GB).  Prior version of Open
  MPI failed silently; this version of Open MPI invokes the
  appropriate MPI error handler upon failure.  See
  https://github.com/open-mpi/ompi/issues/7058 for more details.
  Thanks to Emmanuel Thomé for raising the issue.
- Fix case where 0-extent datatypes might be eliminated during
  optimization.  Thanks to Github user @tjahns for raising the issue.
- Ensure that the MPIR_Breakpoint symbol is not optimized out on
  problematic platforms.
- Fix OMPIO offset calculations with SEEK_END and SEEK_CUR in
  MPI_FILE_GET_POSITION.  Thanks to Wei-keng Liao for raising the
  issue.
- Fix corner case for datatype extent computations.  Thanks to David
  Dickenson for raising the issue.
- Fix MPI buffered sends with the "cm" PML.
- Update to PMIx v2.2.3.
- Fix ssh-based tree-based spawning at scale.  Many thanks to Github
  user @zrss for the report and diagnosis.
- Fix the Open MPI RPM spec file to not abort when grep fails.  Thanks
  to Daniel Letai for bringing this to our attention.
- Handle new SLURM CLI options (SLURM 19 deprecated some options that
  Open MPI was using).  Thanks to Jordan Hayes for the report and the
  initial fix.
- OMPI: fix division by zero with an empty file view.
- Also handle shmat()/shmdt() memory patching with OS-bypass networks.
- Add support for unwinding info to all files that are present in the
  stack starting from MPI_Init, which is helpful with parallel
  debuggers.  Thanks to James Clark for the report and initial fix.
- Fixed inadvertant use of bitwise operators in the MPI C++ bindings
  header files.  Thanks to Bert Wesarg for the report and the fix.
- Added configure option --disable-wrappers-runpath (alongside the
  already-existing --disable-wrappers-rpath option) to prevent Open
  MPI's configure script from automatically adding runpath CLI options
  to the wrapper compilers.

3.0.4 -- April, 2019
--------------------

- Fix compile error when configured with --enable-mpi-java and
  --with-devel-headers.  Thanks to @g-raffy for reporting the issue.
- Fix possible floating point rounding and division issues in OMPIO
  which led to crashes and/or data corruption with very large data.
  Thanks to Axel Huebl and René Widera for identifing the issue,
  supplying and testing the fix (** also appeared: v3.0.4).
- Use static_cast<> in mpi.h where appropriate.  Thanks to @shadow-fx
  for identifying the issue.
- Fix datatype issue with RMA accumulate.  Thanks to Jeff Hammond for
  raising the issue.
- Fix RMA accumulate of non-predefined datatypes with predefined
  operators.  Thanks to Jeff Hammond for raising the issue.
- Fix race condition when closing open file descriptors when launching
  MPI processes.  Thanks to Jason Williams for identifying the issue and
  supplying the fix.
- Fix Valgrind warnings for some MPI_TYPE_CREATE_* functions.  Thanks
  to Risto Toijala for identifying the issue and supplying the fix.
- Fix MPI_TYPE_CREATE_F90_{REAL,COMPLEX} for r=38 and r=308.
- Fix assembly issues with old versions of gcc (<6.0.0) that affected
  the stability of shared memory communications (e.g., with the vader
  BTL).
- Fix the OFI MTL handling of MPI_ANY_SOURCE.
- Fix noisy errors in the openib BTL with regards to
  ibv_exp_query_device().  Thanks to Angel Beltre and others who
  reported the issue.

3.0.3 -- October, 2018
----------------------

- Fix race condition in MPI_THREAD_MULTIPLE support of non-blocking
  send/receive path.
- Fix error handling SIGCHLD forwarding.
- Add support for CHARACTER and LOGICAL Fortran datatypes for MPI_SIZEOF.
- Fix compile error when using OpenJDK 11 to compile the Java bindings.
- Fix crash when using a hostfile with a 'user@host' line.
- Numerous Fortran '08 interface fixes.
- TCP BTL error message fixes.
- OFI MTL now will use any provider other than shm, sockets, tcp, udp, or
  rstream, rather than only supporting gni, psm, and psm2.
- Disable async receive of CUDA buffers by default, fixing a hang
  on large transfers.
- Support the BCM57XXX and BCM58XXX Broadcomm adapters.
- Fix minmax datatype support in ROMIO.
- Bug fixes in vader shared memory transport.
- Support very large buffers with MPI_TYPE_VECTOR.
- Fix hang when launching with mpirun on Cray systems.
- Bug fixes in OFI MTL.
- Assorted Portals 4.0 bug fixes.
- Fix for possible data corruption in MPI_BSEND.
- Move shared memory file for vader btl into /dev/shm on Linux.
- Fix for MPI_ISCATTER/MPI_ISCATTERV Fortran interfaces with MPI_IN_PLACE.
- Upgrade PMIx to v2.1.4.
- Fix for Power9 built-in atomics.
- Numerous One-sided bug fixes.
- Fix for race condition in uGNI BTL.
- Improve handling of large number of interfaces with TCP BTL.
- Numerous UCX bug fixes.
- Add support for QLogic and Broadcom Cumulus RoCE HCAs to Open IB BTL.
- Add patcher support for aarch64.
- Fix hang on Power and ARM when Open MPI was built with low compiler
  optimization settings.

3.0.2 -- June, 2018
-------------------

- Disable osc/pt2pt when using MPI_THREAD_MULTIPLE due to numerous
  race conditions in the component.
- Fix dummy variable names for the mpi and mpi_f08 Fortran bindings to
  match the MPI standard.  This may break applications which use
  name-based parameters in Fortran which used our internal names
  rather than those documented in the MPI standard.
- Fixed MPI_SIZEOF in the "mpi" Fortran module for the NAG compiler.
- Fix RMA function signatures for use-mpi-f08 bindings to have the
  asynchonous property on all buffers.
- Fix Fortran MPI_COMM_SPAWN_MULTIPLE to properly follow the count
  length argument when parsing the array_of_commands variable.
- Revamp Java detection to properly handle new Java versions which do
  not provide a javah wrapper.
- Improved configure logic for finding the UCX library.
- Add support for HDR InfiniBand link speeds.
- Disable the POWER 7/BE block in configure.  Note that POWER 7/BE is
  still not a supported platform, but it is no longer automatically
  disabled.  See
  https://github.com/open-mpi/ompi/issues/4349#issuecomment-374970982
  for more information.

3.0.1 -- March, 2018
----------------------

- Fix ability to attach parallel debuggers to MPI processes.
- Fix a number of issues in MPI I/O found by the HDF5 test suite.
- Fix (extremely) large message transfers with shared memory.
- Fix out of sequence bug in multi-NIC configurations.
- Fix stdin redirection bug that could result in lost input.
- Disable the LSF launcher if CSM is detected.
- Plug a memory leak in MPI_Mem_free().  Thanks to Philip Blakely for reporting.
- Fix the tree spawn operation when the number of nodes is larger than the radix.
  Thanks to Carlos Eduardo de Andrade for reporting.
- Fix Fortran 2008 macro in MPI extensions.  Thanks to Nathan T. Weeks for
  reporting.
- Add UCX to list of interfaces that OpenSHMEM will use by default.
- Add --{enable|disable}-show-load-errors-by-default to control
  default behavior of the load errors option.
- OFI MTL improvements: handle empty completion queues properly, fix
  incorrect error message around fi_getinfo(), use default progress
  option for provider by default, Add support for reading multiple
  CQ events in ofi_progress.
- PSM2 MTL improvements: Allow use of GPU buffers, thread fixes.
- Numerous corrections to memchecker behavior.
- Add a mca parameter ras_base_launch_orted_on_hn to allow for launching
  MPI processes on the same node where mpirun is executing using a separate
  orte daemon, rather than the mpirun process.   This may be useful to set to
  true when using SLURM, as it improves interoperability with SLURM's signal
  propagation tools.  By default it is set to false, except for Cray XC systems.
- Fix a problem reported on the mailing separately by Kevin McGrattan and Stephen
  Guzik about consistency issues on NFS file systems when using OMPIO. This fix
  also introduces a new mca parameter fs_ufs_lock_algorithm which allows to
  control the locking algorithm used by ompio for read/write operations. By
  default, ompio does not perfom locking on local UNIX file systems, locks the
  entire file per operation on NFS file systems, and selective byte-range
  locking on other distributed file systems.
- Add an mca parameter pmix_server_usock_connections to allow mpirun to
  support applications statically built against the Open MPI v2.x release,
  or installed in a container along with the Open MPI v2.x libraries. It is
  set to false by default.

3.0.0 -- September, 2017
------------------------

Major new features:

- Use UCX allocator for OSHMEM symmetric heap allocations to optimize intra-node
  data transfers.  UCX SPML only.
- Use UCX multi-threaded API in the UCX PML.  Requires UCX 1.0 or later.
- Added support for Flux PMI
- Update embedded PMIx to version 2.1.0
- Update embedded hwloc to version 1.11.7

Changes in behavior compared to prior versions:

- Per Open MPI's versioning scheme (see the README), increasing the
  major version number to 3 indicates that this version is not
  ABI-compatible with prior versions of Open MPI. In addition, there may
  be differences in MCA parameter names and defaults from previous releases.
  Command line options for mpirun and other commands may also differ from
  previous versions. You will need to recompile MPI and OpenSHMEM applications
  to work with this version of Open MPI.
- With this release, Open MPI supports MPI_THREAD_MULTIPLE by default.
- New configure options have been added to specify the locations of libnl
  and zlib.
- A new configure option has been added to request Flux PMI support.
- The help menu for mpirun and related commands is now context based.
  "mpirun --help compatibility" generates the help menu in the same format
  as previous releases.

Removed legacy support:
- AIX is no longer supported.
- Loadlever is no longer supported.
- OpenSHMEM currently supports the UCX and MXM transports via the ucx and ikrit
  SPMLs respectively.
- Remove IB XRC support from the OpenIB BTL due to lack of support.
- Remove support for big endian PowerPC.
- Remove support for XL compilers older than v13.1

Known issues:

- MPI_Connect/accept between applications started by different mpirun
  commands will fail, even if ompi-server is running.

2.1.5 -- August 2018
--------------------

- A subtle race condition bug was discovered in the "vader" BTL
  (shared memory communications) that, in rare instances, can cause
  MPI processes to crash or incorrectly classify (or effectively drop)
  an MPI message sent via shared memory.  If you are using the "ob1"
  PML with "vader" for shared memory communication (note that vader is
  the default for shared memory communication with ob1), you need to
  upgrade to v2.1.5 to fix this issue.  You may also upgrade to the
  following versions to fix this issue:
  - Open MPI v3.0.1 (released March, 2018) or later in the v3.0.x
    series
  - Open MPI v3.1.2 (expected end of August, 2018) or later
- A link issue was fixed when the UCX library was not located in the
  linker-default search paths.

2.1.4 -- August, 2018
---------------------

Bug fixes/minor improvements:
- Disable the POWER 7/BE block in configure.  Note that POWER 7/BE is
  still not a supported platform, but it is no longer automatically
  disabled.  See
  https://github.com/open-mpi/ompi/issues/4349#issuecomment-374970982
  for more information.
- Fix bug with request-based one-sided MPI operations when using the
  "rdma" component.
- Fix issue with large data structure in the TCP BTL causing problems
  in some environments.  Thanks to @lgarithm for reporting the issue.
- Minor Cygwin build fixes.
- Minor fixes for the openib BTL:
  - Support for the QLogic RoCE HCA
  - Support for the Boradcom Cumulus RoCE HCA
  - Enable support for HDR link speeds
- Fix MPI_FINALIZED hang if invoked from an attribute destructor
  during the MPI_COMM_SELF destruction in MPI_FINALIZE.  Thanks to
  @AndrewGaspar for reporting the issue.
- Java fixes:
  - Modernize Java framework detection, especially on OS X/MacOS.
    Thanks to Bryce Glover for reporting and submitting the fixes.
  - Prefer "javac -h" to "javah" to support newer Java frameworks.
- Fortran fixes:
  - Use conformant dummy parameter names for Fortran bindings.  Thanks
    to Themos Tsikas for reporting and submitting the fixes.
  - Build the MPI_SIZEOF() interfaces in the "TKR"-style "mpi" module
    whenever possible.  Thanks to Themos Tsikas for reporting the
    issue.
  - Fix array of argv handling for the Fortran bindings of
    MPI_COMM_SPAWN_MULTIPLE (and its associated man page).
  - Make NAG Fortran compiler support more robust in configure.
- Disable the "pt2pt" one-sided MPI component when MPI_THREAD_MULTIPLE
  is used.  This component is simply not safe in MPI_THREAD_MULTIPLE
  scenarios, and will not be fixed in the v2.1.x series.
- Make the "external" hwloc component fail gracefully if it is tries
  to use an hwloc v2.x.y installation.  hwloc v2.x.y will not be
  supported in the Open MPI v2.1.x series.
- Fix "vader" shared memory support for messages larger than 2GB.
  Thanks to Heiko Bauke for the bug report.
- Configure fixes for external PMI directory detection.  Thanks to
  Davide Vanzo for the report.

2.1.3 -- March, 2018
--------------------

Bug fixes/minor improvements:
- Update internal PMIx version to 1.2.5.
- Fix a problem with ompi_info reporting using param option.
  Thanks to Alexander Pozdneev for reporting.
- Correct PMPI_Aint_{add|diff} to be functions (not subroutines)
  in the Fortran mpi_f08 module.
- Fix a problem when doing MPI I/O using data types with large
  extents in conjunction with MPI_TYPE_CREATE_SUBARRAY.  Thanks to
  Christopher Brady for reporting.
- Fix a problem when opening many files using MPI_FILE_OPEN.
  Thanks to William Dawson for reporting.
- Fix a problem with debuggers failing to attach to a running job.
  Thanks to Dirk Schubert for reporting.
- Fix a problem when using madvise and the OpenIB BTL.  Thanks to
  Timo Bingmann for reporting.
- Fix a problem in the Vader BTL that resulted in failures of
  IMB under certain circumstances.  Thanks to Nicolas Morey-
  Chaisemartin for reporting.
- Fix a problem preventing Open MPI from working under Cygwin.
  Thanks to Marco Atzeri for reporting.
- Reduce some verbosity being emitted by the USNIC BTL under certain
  circumstances.  Thanks to Peter Forai for reporting.
- Fix a problem with misdirection of SIGKILL.  Thanks to Michael Fern
  for reporting.
- Replace use of posix_memalign with malloc for small allocations.  Thanks
  to Ben Menaude for reporting.
- Fix a problem with Open MPI's out of band TCP network for file descriptors
  greater than 32767.  Thanks to Wojtek Wasko for reporting and fixing.
- Plug a memory leak in MPI_Mem_free().  Thanks to Philip Blakely for reporting.

2.1.2 -- September, 2017
------------------------

Bug fixes/minor improvements:
- Update internal PMIx version to 1.2.3.
- Fix some problems when using the NAG Fortran compiler to build Open MPI
  and when using the compiler wrappers.  Thanks to Neil Carlson for reporting.
- Fix a compilation problem with the SM BTL.  Thanks to Paul Hargrove for
  reporting.
- Fix a problem with MPI_IALLTOALLW when using zero-length messages.
  Thanks to Dahai Guo for reporting.
- Fix a problem with C11 generic type interface for SHMEM_G.  Thanks
  to Nick Park for reporting.
- Switch to using the lustreapi.h include file when building Open MPI
  with Lustre support.
- Fix a problem in the OB1 PML that led to hangs with OSU collective tests.
- Fix a progression issue with MPI_WIN_FLUSH_LOCAL.  Thanks to
  Joseph Schuchart for reporting.
- Fix an issue with recent versions of PBSPro requiring libcrypto.
  Thanks to Petr Hanousek for reporting.
- Fix a problem when using MPI_ANY_SOURCE with MPI_SENDRECV.
- Fix an issue that prevented signals from being propagated to ORTE
  daemons.
- Ensure that signals are forwarded from ORTE daemons to all processes
  in the process group created by the daemons.  Thanks to Ted Sussman
  for reporting.
- Fix a problem with launching a job under a debugger. Thanks to
  Greg Lee for reporting.
- Fix a problem with Open MPI native I/O MPI_FILE_OPEN when using
  a communicator having an associated topology.  Thanks to
  Wei-keng Liao for reporting.
- Fix an issue when using MPI_ACCUMULATE with derived datatypes.
- Fix a problem with Fortran bindings that led to compilation errors
  for user defined reduction operations.  Thanks to Nathan Weeks for
  reporting.
- Fix ROMIO issues with large writes/reads when using NFS file systems.
- Fix definition of Fortran MPI_ARGV_NULL and MPI_ARGVS_NULL.
- Enable use of the head node of a SLURM allocation on Cray XC systems.
- Fix a problem with synchronous sends when using the UCX PML.
- Use default socket buffer size to improve TCP BTL performance.
- Add a mca parameter ras_base_launch_orted_on_hn to allow for launching
  MPI processes on the same node where mpirun is executing using a separate
  orte daemon, rather than the mpirun process.   This may be useful to set to
  true when using SLURM, as it improves interoperability with SLURM's signal
  propagation tools.  By default it is set to false, except for Cray XC systems.
- Fix --without-lsf when lsf is installed in the default search path.
- Remove support for big endian PowerPC.
- Remove support for XL compilers older than v13.1
- Remove IB XRC support from the OpenIB BTL due to loss of maintainer.

2.1.1 -- April, 2017
--------------------

Bug fixes/minor improvements:

- Fix a problem with one of Open MPI's fifo data structures which led to
  hangs in a make check test.  Thanks to Nicolas Morey-Chaisemartin for
  reporting.
- Add missing MPI_AINT_ADD/MPI_AINT_DIFF function definitions to mpif.h.
  Thanks to Aboorva Devarajan for reporting.
- Fix the error return from MPI_WIN_LOCK when rank argument is invalid.
  Thanks to Jeff Hammond for reporting and fixing this issue.
- Fix a problem with mpirun/orterun when started under a debugger. Thanks
  to Gregory Leff for reporting.
- Add configury option to disable use of CMA by the vader BTL.  Thanks
  to Sascha Hunold for reporting.
- Add configury check for MPI_DOUBLE_COMPLEX datatype support.
  Thanks to Alexander Klein for reporting.
- Fix memory allocated by MPI_WIN_ALLOCATE_SHARED to
  be 64 bit aligned.  Thanks to Joseph Schuchart for
  reporting.
- Update MPI_WTICK man page to reflect possibly higher
  resolution than 10e-6.  Thanks to Mark Dixon for
  reporting
- Add missing MPI_T_PVAR_SESSION_NULL definition to mpi.h
  include file.  Thanks to Omri Mor for this contribution.
- Enhance the Open MPI spec file to install modulefile in /opt
  if installed in a non-default location.  Thanks to Kevin
  Buckley for reporting and supplying a fix.
- Fix a problem with conflicting PMI symbols when linking statically.
  Thanks to Kilian Cavalotti for reporting.

Known issues (to be addressed in v2.1.2):

- See the list of fixes slated for v2.1.2 here:
  https://github.com/open-mpi/ompi/milestone/28

2.1.0 -- March, 2017
--------------------

Major new features:

- The main focus of the Open MPI v2.1.0 release was to update to PMIx
  v1.2.1.  When using PMIx (e.g., via mpirun-based launches, or via
  direct launches with recent versions of popular resource managers),
  launch time scalability is improved, and the run time memory
  footprint is greatly decreased when launching large numbers of MPI /
  OpenSHMEM processes.
- Update OpenSHMEM API conformance to v1.3.
- The usnic BTL now supports MPI_THREAD_MULTIPLE.
- General/overall performance improvements to MPI_THREAD_MULTIPLE.
- Add a summary message at the bottom of configure that tells you many
  of the configuration options specified and/or discovered by Open
  MPI.

Changes in behavior compared to prior versions:

- None.

Removed legacy support:

- The ptmalloc2 hooks have been removed from the Open MPI code base.
  This is not really a user-noticable change; it is only mentioned
  here because there was much rejoycing in the Open MPI developer
  community.

Bug fixes/minor improvements:

- New MCA parameters:
  - iof_base_redirect_app_stderr_to_stdout: as its name implies, it
    combines MPI / OpenSHMEM applications' stderr into its stdout
    stream.
  - opal_event_include: allow the user to specify which FD selection
    mechanism is used by the underlying event engine.
  - opal_stacktrace_output: indicate where stacktraces should be sent
    upon MPI / OpenSHMEM process crashes ("none", "stdout", "stderr",
    "file:filename").
  - orte_timeout_for_stack_trace: number of seconds to wait for stack
    traces to be reported (or <=0 to wait forever).
  - mtl_ofi_control_prog_type/mtl_ofi_data_prog_type: specify libfabric
    progress model to be used for control and data.
- Fix MPI_WTICK regression where the time reported may be inaccurate
  on systems with processor frequency scalaing enabled.
- Fix regression that lowered the memory maximum message bandwidth for
  large messages on some BTL network transports, such as openib, sm,
  and vader.
- Fix a name collision in the shared file pointer MPI IO file locking
  scheme.  Thanks to Nicolas Joly for reporting the issue.
- Fix datatype extent/offset errors in MPI_PUT and MPI_RACCUMULATE
  when using the Portals 4 one-sided component.
- Add support for non-contiguous datatypes to the Portals 4 one-sided
  component.
- Various updates for the UCX PML.
- Updates to the following man pages:
  - mpirun(1)
  - MPI_COMM_CONNECT(3)
  - MPI_WIN_GET_NAME(3). Thanks to Nicolas Joly for reporting the
    typo.
  - MPI_INFO_GET_[NKEYS|NTHKEY](3). Thanks to Nicolas Joly for
    reporting the typo.
- Fixed a problem in the TCP BTL when using MPI_THREAD_MULTIPLE.
  Thanks to Evgueni Petrov for reporting.
- Fixed external32 representation in the romio314 module.  Note that
  for now, external32 representation is not correctly supported by the
  ompio module.  Thanks to Thomas Gastine for bringing this to our
  attention.
- Add note how to disable a warning message about when a high-speed
  MPI transport is not found.  Thanks to Susan Schwarz for reporting
  the issue.
- Ensure that sending SIGINT when using the rsh/ssh launcher does not
  orphan children nodes in the launch tree.
- Fix the help message when showing deprecated MCA param names to show
  the correct (i.e., deprecated) name.
- Enable support for the openib BTL to use multiple different
  InfiniBand subnets.
- Fix a minor error in MPI_AINT_DIFF.
- Fix bugs with MPI_IN_PLACE handling in:
  - MPI_ALLGATHER[V]
  - MPI_[I][GATHER|SCATTER][V]
  - MPI_IREDUCE[_SCATTER]
  - Thanks to all the users who helped diagnose these issues.
- Allow qrsh to tree spawn (if the back-end system supports it).
- Fix MPI_T_PVAR_GET_INDEX to return the correct index.
- Correctly position the shared file pointer in append mode in the
  OMPIO component.
- Add some deprecated names into shmem.h for backwards compatibility
  with legacy codes.
- Fix MPI_MODE_NOCHECK support.
- Fix a regression in PowerPC atomics support.  Thanks to Orion
  Poplawski for reporting the issue.
- Fixes for assembly code with aggressively-optimized compilers on
  x86_64/AMD64 platforms.
- Fix one more place where configure was mangling custom CFLAGS.
  Thanks to Phil Tooley (@Telemin) for reporting the issue.
- Better handle builds with external installations of hwloc.
- Fixed a hang with MPI_PUT and MPI_WIN_LOCK_ALL.
- Fixed a bug when using MPI_GET on non-contiguous datatypes and
  MPI_LOCK/MPI_UNLOCK.
- Fixed a bug when using POST/START/COMPLETE/WAIT after a fence.
- Fix configure portability by cleaning up a few uses of "==" with
  "test".  Thanks to Kevin Buckley for pointing out the issue.
- Fix bug when using darrays with lib and extent of darray datatypes.
- Updates to make Open MPI binary builds more bit-for-bit
  reproducable.  Thanks to Alastair McKinstry for the suggestion.
- Fix issues regarding persistent request handling.
- Ensure that shmemx.h is a standalone OpenSHMEM header file.  Thanks
  to Nick Park (@nspark) for the report.
- Ensure that we always send SIGTERM prior to SIGKILL.  Thanks to Noel
  Rycroft for the report.
- Added ConnectX-5 and Chelsio T6 device defaults for the openib BTL.
- OpenSHMEM no longer supports MXM less than v2.0.
- Plug a memory leak in ompi_osc_sm_free.  Thanks to Joseph Schuchart
  for the report.
- The "self" BTL now uses less memory.
- The vader BTL is now more efficient in terms of memory usage when
  using XPMEM.
- Removed the --enable-openib-failover configure option.  This is not
  considered backwards-incompatible because this option was stale and
  had long-since stopped working, anyway.
- Allow jobs launched under Cray aprun to use hyperthreads if
  opal_hwloc_base_hwthreads_as_cpus MCA parameter is set.
- Add support for 32-bit and floating point Cray Aries atomic
  operations.
- Add support for network AMOs for MPI_ACCUMULATE, MPI_FETCH_AND_OP,
  and MPI_COMPARE_AND_SWAP if the "ompi_single_intrinsic" info key is
  set on the window or the "acc_single_intrinsic" MCA param is set.
- Automatically disqualify RDMA CM support in the openib BTL if
  MPI_THREAD_MULTIPLE is used.
- Make configure smarter/better about auto-detecting Linux CMA
  support.
- Improve the scalability of MPI_COMM_SPLIT_TYPE.
- Fix the mixing of C99 and C++ header files with the MPI C++
  bindings.  Thanks to Alastair McKinstry for the bug report.
- Add support for ARM v8.
- Several MCA parameters now directly support MPI_T enumerator
  semantics (i.e., they accept a limited set of values -- e.g., MCA
  parameters that accept boolean values).
- Added --with-libmpi-name=STRING configure option for vendor releases
  of Open MPI.  See the README for more detail.
- Fix a problem with Open MPI's internal memory checker.  Thanks to Yvan
  Fournier for reporting.
- Fix a multi-threaded issue with MPI_WAIT.  Thanks to Pascal Deveze for
  reporting.

Known issues (to be addressed in v2.1.1):

- See the list of fixes slated for v2.1.1 here:
  https://github.com/open-mpi/ompi/milestone/26

2.0.4 -- November, 2017
-----------------------

Bug fixes/minor improvements:
- Fix an issue with visibility of functions defined in the built-in PMIx.
  Thanks to Siegmar Gross for reporting this issue.
- Add configure check to prevent trying to build this release of
  Open MPI with an external hwloc 2.0 or newer release.
- Add ability to specify layered providers for OFI MTL.
- Fix a correctness issue with Open MPI's memory manager code
  that could result in corrupted message data.  Thanks to
  Valentin Petrov for reporting.
- Fix issues encountered when using newer versions of PBS Pro.
  Thanks to Petr Hanousek for reporting.
- Fix a problem with MPI_GET when using the vader BTL.  Thanks
  to Dahai Guo for reporting.
- Fix a problem when using MPI_ANY_SOURCE with MPI_SENDRECV_REPLACE.
  Thanks to Dahai Guo for reporting.
- Fix a problem using MPI_FILE_OPEN with a communicator with an
  attached cartesian topology.  Thanks to Wei-keng Liao for reporting.
- Remove IB XRC support from the OpenIB BTL due to lack of support.
- Remove support for big endian PowerPC.
- Remove support for XL compilers older than v13.1

2.0.3 -- June 2017
------------------

Bug fixes/minor improvements:

 - Fix a problem with MPI_IALLTOALLW when zero size messages are present.
   Thanks to @mathbird for reporting.
 - Add missing MPI_USER_FUNCTION definition to the mpi_f08 module.
   Thanks to Nathan Weeks for reporting this issue.
 - Fix a problem with MPI_WIN_LOCK not returning an error code when
   a negative rank is supplied.  Thanks to Jeff Hammond for reporting and
   providing a fix.
 - Fix a problem with make check that could lead to hangs.  Thanks to
   Nicolas Morey-Chaisemartin for reporting.
 - Resolve a symbol conflict problem with PMI-1 and PMI-2 PMIx components.
   Thanks to Kilian Cavalotti for reporting this issue.
 - Insure that memory allocations returned from MPI_WIN_ALLOCATE_SHARED are
   64 byte aligned.  Thanks to Joseph Schuchart for reporting this issue.
 - Make use of DOUBLE_COMPLEX, if available, for Fortran bindings.  Thanks
   to Alexander Klein for reporting this issue.
 - Add missing MPI_T_PVAR_SESSION_NULL definition to Open MPI mpi.h include
   file.  Thanks to Omri Mor for reporting and fixing.
 - Fix a problem with use of MPI shared file pointers when accessing
   a file from independent jobs.  Thanks to Nicolas Joly for reporting
   this issue.
 - Optimize zero size MPI_IALLTOALL{V,W} with MPI_IN_PLACE.  Thanks to
   Lisandro Dalcín for the report.
 - Fix a ROMIO buffer overflow problem for large transfers when using NFS
   filesystems.
 - Fix type of MPI_ARGV[S]_NULL which prevented it from being used
   properly with MPI_COMM_SPAWN[_MULTIPLE] in the mpi_f08 module.
 - Ensure to add proper linker flags to the wrapper compilers for
   dynamic libraries on platforms that need it (e.g., RHEL 7.3 and
   later).
 - Get better performance on TCP-based networks 10Gbps and higher by
   using OS defaults for buffer sizing.
 - Fix a bug with MPI_[R][GET_]ACCUMULATE when using DARRAY datatypes.
 - Fix handling of --with-lustre configure command line argument.
   Thanks to Prentice Bisbal and Tim Mattox for reporting the issue.
 - Added MPI_AINT_ADD and MPI_AINT_DIFF declarations to mpif.h.  Thanks
   to Aboorva Devarajan (@AboorvaDevarajan) for the bug report.
 - Fix a problem in the TCP BTL when Open MPI is initialized with
   MPI_THREAD_MULTIPLE support.  Thanks to Evgueni Petro for analyzing and
   reporting this issue.
 - Fix yalla PML to properly handle underflow errors, and fixed a
   memory leak with blocking non-contiguous sends.
 - Restored ability to run autogen.pl on official distribution tarballs
   (although this is still not recommended for most users!).
 - Fix accuracy problems with MPI_WTIME on some systems by always using
   either clock_gettime(3) or gettimeofday(3).
 - Fix a problem where MPI_WTICK was not returning a higher time resolution
   when available.  Thanks to Mark Dixon for reporting this issue.
 - Restore SGE functionality.  Thanks to Kevin Buckley for the initial
   report.
 - Fix external hwloc compilation issues, and extend support to allow
   using external hwloc installations as far back as v1.5.0.  Thanks to
   Orion Poplawski for raising the issue.
 - Added latest Mellanox Connect-X and Chelsio T-6 adapter part IDs to
   the openib list of default values.
 - Do a better job of cleaning up session directories (e.g., in /tmp).
 - Update a help message to indicate how to suppress a warning about
   no high performance networks being detected by Open MPI.  Thanks to
   Susan Schwarz for reporting this issue.
 - Fix a problem with mangling of custom CFLAGS when configuring Open MPI.
   Thanks to Phil Tooley for reporting.
 - Fix some minor memory leaks and remove some unused variables.
   Thanks to Joshua Gerrard for reporting.
 - Fix MPI_ALLGATHERV bug with MPI_IN_PLACE.

Known issues (to be addressed in v2.0.4):

- See the list of fixes slated for v2.0.4 here:
  https://github.com/open-mpi/ompi/milestone/29

2.0.2 -- 26 January 2017
-------------------------

Bug fixes/minor improvements:

- Fix a problem with MPI_FILE_WRITE_SHARED when using MPI_MODE_APPEND and
  Open MPI's native MPI-IO implementation.  Thanks to Nicolas Joly for
  reporting.
- Fix a typo in the MPI_WIN_GET_NAME man page.  Thanks to Nicolas Joly
  for reporting.
- Fix a race condition with ORTE's session directory setup.  Thanks to
  @tbj900 for reporting this issue.
- Fix a deadlock issue arising from Open MPI's approach to catching calls to
  munmap. Thanks to Paul Hargrove for reporting and helping to analyze this
  problem.
- Fix a problem with PPC atomics which caused make check to fail unless builtin
  atomics configure option was enabled.  Thanks to Orion Poplawski for reporting.
- Fix a problem with use of x86_64 cpuid instruction which led to segmentation
  faults when Open MPI was configured with -O3 optimization.  Thanks to Mark
  Santcroos for reporting this problem.
- Fix a problem when using built in atomics configure options on PPC platforms
  when building 32 bit applications.  Thanks to Paul Hargrove for reporting.
- Fix a problem with building Open MPI against an external hwloc installation.
  Thanks to Orion Poplawski for reporting this issue.
- Remove use of DATE in the message queue version string reported to debuggers to
  insure bit-wise reproducibility of binaries.  Thanks to Alastair McKinstry
  for help in fixing this problem.
- Fix a problem with early exit of a MPI process without calling MPI_FINALIZE
  or MPI_ABORT that could lead to job hangs.  Thanks to Christof Koehler for
  reporting.
- Fix a problem with forwarding of SIGTERM signal from mpirun to MPI processes
  in a job.  Thanks to Noel Rycroft for reporting this problem
- Plug some memory leaks in MPI_WIN_FREE discovered using Valgrind.  Thanks
  to Joseph Schuchart for reporting.
- Fix a problems  MPI_NEIGHOR_ALLTOALL when using a communicator with an empty topology
  graph.  Thanks to Daniel Ibanez for reporting.
- Fix a typo in a PMIx component help file.  Thanks to @njoly for reporting this.
- Fix a problem with Valgrind false positives when using Open MPI's internal memchecker.
  Thanks to Yvan Fournier for reporting.
- Fix a problem with MPI_FILE_DELETE returning MPI_SUCCESS when
  deleting a non-existent file. Thanks to Wei-keng Liao for reporting.
- Fix a problem with MPI_IMPROBE that could lead to hangs in subsequent MPI
  point to point or collective calls.  Thanks to Chris Pattison for reporting.
- Fix a problem when configure Open MPI for powerpc with --enable-mpi-cxx
  enabled.  Thanks to Alastair McKinstry for reporting.
- Fix a problem using MPI_IALLTOALL with MPI_IN_PLACE argument.  Thanks to
  Chris Ward for reporting.
- Fix a problem using MPI_RACCUMULATE with the Portals4 transport.  Thanks to
  @PDeveze for reporting.
- Fix an issue with static linking and duplicate symbols arising from PMIx
  Slurm components.  Thanks to Limin Gu for reporting.
- Fix a problem when using MPI dynamic memory windows.  Thanks to
  Christoph Niethammer for reporting.
- Fix a problem with Open MPI's pkgconfig files.  Thanks to Alastair McKinstry
  for reporting.
- Fix a problem with MPI_IREDUCE when the same buffer is supplied for the
  send and recv buffer arguments.  Thanks to Valentin Petrov for reporting.
- Fix a problem with atomic operations on PowerPC.  Thanks to Paul
  Hargrove for reporting.

Known issues (to be addressed in v2.0.3):

- See the list of fixes slated for v2.0.3 here:
  https://github.com/open-mpi/ompi/milestone/23

2.0.1 -- 2 September 2016
-----------------------

Bug fixes/minor improvements:

- Short message latency and message rate performance improvements for
  all transports.
- Fix shared memory performance when using RDMA-capable networks.
  Thanks to Tetsuya Mishima and Christoph Niethammer for reporting.
- Fix bandwith performance degredation in the yalla (MXM) PML.  Thanks
  to Andreas Kempf for reporting the issue.
- Fix OpenSHMEM crash when running on non-Mellanox MXM-based networks.
  Thanks to Debendra Das for reporting the issue.
- Fix a crash occuring after repeated calls to MPI_FILE_SET_VIEW with
  predefined datatypes.  Thanks to Eric Chamberland and Matthew
  Knepley for reporting and helping chase down this issue.
- Fix stdin propagation to MPI processes.  Thanks to Jingchao Zhang
  for reporting the issue.
- Fix various runtime and portability issues by updating the PMIx
  internal component to v1.1.5.
- Fix process startup failures on Intel MIC platforms due to very
  large entries in /proc/mounts.
- Fix a problem with use of relative path for specifing executables to
  mpirun/oshrun.  Thanks to David Schneider for reporting.
- Various improvements when running over portals-based networks.
- Fix thread-based race conditions with GNI-based networks.
- Fix a problem with MPI_FILE_CLOSE and MPI_FILE_SET_SIZE.  Thanks
  to Cihan Altinay for reporting.
- Remove all use of rand(3) from within Open MPI so as not to perturb
  applications use of it.  Thanks to Matias Cabral and Noel Rycroft
  for reporting.
- Fix crash in MPI_COMM_SPAWN.
- Fix types for MPI_UNWEIGHTED and MPI_WEIGHTS_EMPTY.  Thanks to
  Lisandro Dalcín for reporting.
- Correctly report the name of MPI_INTEGER16.
- Add some missing MPI constants to the Fortran bindings.
- Fixed compile error when configuring Open MPI with --enable-timing.
- Correctly set the shared library version of libompitrace.so.  Thanks
  to Alastair McKinstry for reporting.
- Fix errors in the MPI_RPUT, MPI_RGET, MPI_RACCUMULATE, and
  MPI_RGET_ACCUMULATE Fortran bindings.  Thanks to Alfio Lazzaro and
  Joost VandeVondele for tracking this down.
- Fix problems with use of derived datatypes in non-blocking
  collectives.  Thanks to Yuki Matsumoto for reporting.
- Fix problems with OpenSHMEM header files when using CMake.  Thanks to
  Paul Kapinos for reporting the issue.
- Fix problem with use use of non-zero lower bound datatypes in
  collectives.  Thanks to Hristo Iliev for reporting.
- Fix a problem with memory allocation within MPI_GROUP_INTERSECTION.
  Thanks to Lisandro Dalcín for reporting.
- Fix an issue with MPI_ALLGATHER for communicators that don't consist
  of two ranks.  Thanks to David Love for reporting.
- Various fixes for collectives when used with esoteric MPI datatypes.
- Fixed corner cases of handling DARRAY and HINDEXED_BLOCK datatypes.
- Fix a problem with filesystem type check for OpenBSD.
  Thanks to Paul Hargrove for reporting.
- Fix some debug input within Open MPI internal functions.  Thanks to
  Durga Choudhury for reporting.
- Fix a typo in a configury help message.  Thanks to Paul Hargrove for
  reporting.
- Correctly support MPI_IN_PLACE in MPI_[I]ALLTOALL[V|W] and
  MPI_[I]EXSCAN.
- Fix alignment issues on SPARC platforms.

Known issues (to be addressed in v2.0.2):

- See the list of fixes slated for v2.0.2 here:
  https://github.com/open-mpi/ompi/milestone/20, and
  https://github.com/open-mpi/ompi-release/milestone/19
  (note that the "ompi-release" Github repo will be folded/absorbed
  into the "ompi" Github repo at some point in the future)


2.0.0 -- 12 July 2016
---------------------

 **********************************************************************
 *  Open MPI is now fully MPI-3.1 compliant
 **********************************************************************

Major new features:

- Many enhancements to MPI RMA.  Open MPI now maps MPI RMA operations
  on to native RMA operations for those networks which support this
  capability.
- Greatly improved support for MPI_THREAD_MULTIPLE (when configured
  with --enable-mpi-thread-multiple).
- Enhancements to reduce the memory footprint for jobs at scale.  A
  new MCA parameter, "mpi_add_procs_cutoff", is available to set the
  threshold for using this feature.
- Completely revamped support for memory registration hooks when using
  OS-bypass network transports.
- Significant OMPIO performance improvements and many bug fixes.
- Add support for PMIx - Process Management Interface for Exascale.
  Version 1.1.2 of PMIx is included internally in this release.
- Add support for PLFS file systems in Open MPI I/O.
- Add support for UCX transport.
- Simplify build process for Cray XC systems.  Add support for
  using native SLURM.
- Add a --tune mpirun command line option to simplify setting many
  environment variables and MCA parameters.
- Add a new MCA parameter "orte_default_dash_host" to offer an analogue
  to the existing "orte_default_hostfile" MCA parameter.
- Add the ability to specify the number of desired slots in the mpirun
  --host option.

Changes in behavior compared to prior versions:

- In environments where mpirun cannot automatically determine the
  number of slots available (e.g., when using a hostfile that does not
  specify "slots", or when using --host without specifying a ":N"
  suffix to hostnames), mpirun now requires the use of "-np N" to
  specify how many MPI processes to launch.
- The MPI C++ bindings -- which were removed from the MPI standard in
  v3.0 -- are no longer built by default and will be removed in some
  future version of Open MPI.  Use the --enable-mpi-cxx-bindings
  configure option to build the deprecated/removed MPI C++ bindings.
- ompi_info now shows all components, even if they do not have MCA
  parameters.  The prettyprint output now separates groups with a
  dashed line.
- OMPIO is now the default implementation of parallel I/O, with the
  exception for Lustre parallel filesystems (where ROMIO is still the
  default).  The default selection of OMPI vs. ROMIO can be controlled
  via the "--mca io ompi|romio" command line switch to mpirun.
- Per Open MPI's versioning scheme (see the README), increasing the
  major version number to 2 indicates that this version is not
  ABI-compatible with prior versions of Open MPI.  You will need to
  recompile MPI and OpenSHMEM applications to work with this version
  of Open MPI.
- Removed checkpoint/restart code due to loss of maintainer. :-(
- Change the behavior for handling certain signals when using PSM and
  PSM2 libraries.  Previously, the PSM and PSM2 libraries would trap
  certain signals in order to generate tracebacks.  The mechanism was
  found to cause issues with Open MPI's own error reporting mechanism.
  If not already set, Open MPI now sets the IPATH_NO_BACKTRACE and
  HFI_NO_BACKTRACE environment variables to disable PSM/PSM2's
  handling these signals.

Removed legacy support:

- Removed support for OS X Leopard.
- Removed support for Cray XT systems.
- Removed VampirTrace.
- Removed support for Myrinet/MX.
- Removed legacy collective module:ML.
- Removed support for Alpha processors.
- Removed --enable-mpi-profiling configure option.

Known issues (to be addressed in v2.0.1):

- See the list of fixes slated for v2.0.1 here:
  https://github.com/open-mpi/ompi/milestone/16, and
  https://github.com/open-mpi/ompi-release/milestone/16
  (note that the "ompi-release" Github repo will be folded/absorbed
  into the "ompi" Github repo at some point in the future)

- ompi-release#986: Fix data size counter for large ops with fcoll/static
- ompi-release#987: Fix OMPIO performance on Lustre
- ompi-release#1013: Fix potential inconsistency in btl/openib default settings
- ompi-release#1014: Do not return MPI_ERR_PENDING from collectives
- ompi-release#1056: Remove dead profile code from oshmem
- ompi-release#1081: Fix MPI_IN_PLACE checking for IALLTOALL{V|W}
- ompi-release#1081: Fix memchecker in MPI_IALLTOALLW
- ompi-release#1081: Support MPI_IN_PLACE in MPI_(I)ALLTOALLW and MPI_(I)EXSCAN
- ompi-release#1107: Allow future PMIx support for RM spawn limits
- ompi-release#1108: Fix sparse group process reference counting
- ompi-release#1109: If specified to be oversubcribed, disable binding
- ompi-release#1122: Allow NULL arrays for empty datatypes
- ompi-release#1123: Fix signed vs. unsigned compiler warnings
- ompi-release#1123: Make max hostname length uniform across code base
- ompi-release#1127: Fix MPI_Compare_and_swap
- ompi-release#1127: Fix MPI_Win_lock when used with MPI_Win_fence
- ompi-release#1132: Fix typo in help message for --enable-mca-no-build
- ompi-release#1154: Ensure pairwise coll algorithms disqualify themselves properly
- ompi-release#1165: Fix typos in debugging/verbose message output
- ompi-release#1178: Fix ROMIO filesystem check on OpenBSD 5.7
- ompi-release#1197: Fix Fortran pthread configure check
- ompi-release#1205: Allow using external PMIx 1.1.4 and 2.0
- ompi-release#1215: Fix configure to support the NAG Fortran compiler
- ompi-release#1220: Fix combiner args for MPI_HINDEXED_BLOCK
- ompi-release#1225: Fix combiner args for MPI_DARRAY
- ompi-release#1226: Disable old memory hooks with recent gcc versions
- ompi-release#1231: Fix new "patcher" support for some XLC platforms
- ompi-release#1244: Fix Java error handling
- ompi-release#1250: Ensure TCP is not selected for RDMA operations
- ompi-release#1252: Fix verbose output in coll selection
- ompi-release#1253: Set a default name for user-defined MPI_Op
- ompi-release#1254: Add count==0 checks in some non-blocking colls
- ompi-release#1258: Fix "make distclean" when using external pmix/hwloc/libevent
- ompi-release#1260: Clean up/uniform mca/coll/base memory management
- ompi-release#1261: Remove "patcher" warning message for static builds
- ompi-release#1263: Fix IO MPI_Request for 0-size read/write
- ompi-release#1264: Add blocking fence for SLURM operations

Bug fixes / minor enhancements:

- Updated internal/embedded copies of third-party software:
  - Update the internal copy of ROMIO to that which shipped in MPICH
    3.1.4.
  - Update internal copy of libevent to v2.0.22.
  - Update internal copy of hwloc to v1.11.2.
- Notable new MCA parameters:
  - opal_progress_lp_call_ration: Control how often low-priority
    callbacks are made during Open MPI's main progress loop.
  - opal_common_verbs_want_fork_support: This replaces the
    btl_openib_want_fork_support parameter.
- Add --with-platform-patches-dir configure option.
- Add --with-pmi-libdir configure option for environments that install
  PMI libs in a non-default location.
- Various configure-related compatibility updates for newer versions
  of libibverbs and OFED.
- Numerous fixes/improvements to orte-dvm.  Special thanks to Mark
  Santcroos for his help.
- Fix a problem with timer code on ia32 platforms.  Thanks to
  Paul Hargrove for reporting this and providing a patch.
- Fix a problem with use of a 64 bit atomic counter.  Thanks to
  Paul Hargrove for reporting.
- Fix a problem with singleton job launching.  Thanks to Lisandro
  Dalcín for reporting.
- Fix a problem with use of MPI_UNDEFINED with MPI_COMM_SPLIT_TYPE.
  Thanks to Lisandro Dalcín for reporting.
- Silence a compiler warning in PSM MTL.  Thanks to Adrian Reber for
  reporting this.
- Properly detect Intel TrueScale and OmniPath devices in the ACTIVE
  state.  Thanks to Durga Choudhury for reporting the issue.
- Fix detection and use of Solaris Studio 12.5 (beta) compilers.
  Thanks to Paul Hargrove for reporting and debugging.
- Fix various small memory leaks.
- Allow NULL arrays when creating empty MPI datatypes.
- Replace use of alloca with malloc for certain datatype creation
  functions.  Thanks to Bogdan Sataric for reporting this.
- Fix use of MPI_LB and MPI_UB in creation of of certain MPI datatypes.
  Thanks to Gus Correa for helping to fix this.
- Implement a workaround for a GNU Libtool problem.  Thanks to Eric
  Schnetter for reporting and fixing.
- Improve hcoll library detection in configure.  Thanks to David
  Shrader and Åke Sandgren for reporting this.
- Miscellaneous minor bug fixes in the hcoll component.
- Miscellaneous minor bug fixes in the ugni component.
- Fix problems with XRC detection in OFED 3.12 and older releases.
  Thanks to Paul Hargrove for his analysis of this problem.
- Update (non-standard/experimental) Java MPI interfaces to support
  MPI-3.1 functionality.
- Fix an issue with MCA parameters for Java bindings.  Thanks to
  Takahiro Kawashima and Siegmar Gross for reporting this issue.
- Fix a problem when using persistent requests in the Java bindings.
  Thanks to Nate Chambers for reporting.
- Fix problem with Java bindings on OX X 10.11.  Thanks to Alexander
  Daryin for reporting this issue.
- Fix a performance problem for large messages for Cray XC systems.
  Thanks to Jerome Vienne for reporting this.
- Fix an issue with MPI_WIN_LOCK_ALL.  Thanks to Thomas Jahns for
  reporting.
- Fix an issue with passing a parameter to configure multiple times.
  Thanks to QuesarVII for reporting and supplying a fix.
- Add support for ALPS resource allocation system on Cray CLE 5.2 and
  later.  Thanks to Mark Santcroos.
- Corrections to the HACKING file.  Thanks to Maximilien Levesque.
- Fix an issue with user supplied reduction operator functions.
  Thanks to Rupert Nash for reporting this.
- Fix an issue with an internal list management function.  Thanks to
  Adrian Reber for reporting this.
- Fix a problem with MPI-RMA PSCW epochs.  Thanks to Berk Hess for
  reporting this.
- Fix a problem in neighborhood collectives.  Thanks to Lisandro
  Dalcín for reporting.
- Fix MPI_IREDUCE_SCATTER_BLOCK for a one-process communicator. Thanks
  to Lisandro Dalcín for reporting.
- Add (Open MPI-specific) additional flavors to MPI_COMM_SPLIT_TYPE.
  See MPI_Comm_split_type(3) for details.  Thanks to Nick Andersen for
  supplying this enhancement.
- Improve closing of file descriptors during the job launch phase.
  Thanks to Piotr Lesnicki for reporting and providing this
  enhancement.
- Fix a problem in MPI_GET_ACCUMULATE and MPI_RGET_ACCUMULATE when
  using Portals4.  Thanks to Nicolas Chevalier for reporting.
- Use correct include file for lstat prototype in ROMIO. Thanks to
  William Throwe for finding and providing a fix.
- Add missing Fortran bindings for MPI_WIN_ALLOCATE.  Thanks to Christoph
  Niethammer for reporting and fixing.
- Fortran related fixes to handle Intel 2016 compiler.  Thanks to
  Fabrice Roy for reporting this.
- Fix a Fortran linkage issue.  Thanks to Macro Atzeri for finding and
  suggesting a fix.
- Fix problem with using BIND(C) for Fortran bindings with logical
  parameters.  Thanks to Paul Romano for reporting.
- Fix an issue with use of DL-related macros in opal library.  Thanks to
  Scott Atchley for finding this.
- Fix an issue with parsing mpirun command line options which contain
  colons.  Thanks to Lev Given for reporting.
- Fix a problem with Open MPI's package configury files.  Thanks to
  Christoph Junghans for reporting.
- Fix a typo in the MPI_INTERCOMM_MERGE man page.  Thanks To Harald
  Servat for reporting and correcting.
- Update man pages for non-blocking sends per MPI 3.1 standard.
  Thanks to Alexander Pozdneev for reporting.
- Fix problem when compiling against PVFS2.  Thanks to Dave Love for
  reporting.
- Fix problems with MPI_NEIGHBOR_ALLTOALL{V,W}.  Thanks to Willem
  Vermin for reporting this issue.
- Fix various compilation problems on Cygwin.  Thanks to Marco Atzeri
  for supplying these fixes.
- Fix problem with resizing of subarray and darray data types.  Thanks
  to Keith Bennett and Dan Garmann for reporting.
- Fix a problem with MPI_COMBINER_RESIZED.  Thanks to James Ramsey for
  the report.
- Fix an hwloc binding issue.  Thanks to Ben Menadue for reporting.
- Fix a problem with the shared memory (sm) BTL.  Thanks to Peter Wind
  for the report.
- Fixes for heterogeneous support. Thanks to Siegmar Gross for reporting.
- Fix a problem with memchecker.  Thanks to Clinton Simpson for reporting.
- Fix a problem with MPI_UNWEIGHTED in topology functions.  Thanks to
  Jun Kudo for reporting.
- Fix problem with a MCA parameter base filesystem types.  Thanks to
  Siegmar Gross for reporting.
- Fix a problem with some windows info argument types.  Thanks to
  Alastair McKinstry for reporting.


1.10.7 - 16 May 2017
------
- Fix bug in TCP BTL that impacted performance on 10GbE (and faster)
  networks by not adjusting the TCP send/recv buffer sizes and using
  system default values
- Add missing MPI_AINT_ADD and MPI_AINT_DIFF function delcarations in
  mpif.h
- Fixed time reported by MPI_WTIME; it was previously reported as
  dependent upon the CPU frequency.
- Fix platform detection on FreeBSD
- Fix a bug in the handling of MPI_TYPE_CREATE_DARRAY in
  MPI_(R)(GET_)ACCUMULATE
- Fix openib memory registration limit calculation
- Add missing MPI_T_PVAR_SESSION_NULL in mpi.h
- Fix "make distcheck" when using external hwloc and/or libevent packages
- Add latest ConnectX-5 vendor part id to OpenIB device params
- Fix race condition in the UCX PML
- Fix signal handling for rsh launcher
- Fix Fortran compilation errors by removing MPI_SIZEOF in the Fortran
  interfaces when the compiler does not support it
- Fixes for the pre-ignore-TKR "mpi" Fortran module implementation
  (i.e., for older Fortran compilers -- these problems did not exist
  in the "mpi" module implementation for modern Fortran compilers):
  - Add PMPI_* interfaces
  - Fix typo in MPI_FILE_WRITE_AT_ALL_BEGIN interface name
  - Fix typo in MPI_FILE_READ_ORDERED_BEGIN interface name
- Fixed the type of MPI_DISPLACEMENT_CURRENT in all Fortran interfaces
  to be an INTEGER(KIND=MPI_OFFSET_KIND).
- Fixed typos in MPI_INFO_GET_* man pages.  Thanks to Nicolas Joly for
  the patch
- Fix typo bugs in wrapper compiler script


1.10.6 - 17 Feb 2017
------
- Fix bug in timer code that caused problems at optimization settings
  greater than 2
- OSHMEM: make mmap allocator the default instead of sysv or verbs
- Support MPI_Dims_create with dimension zero
- Update USNIC support
- Prevent 64-bit overflow on timer counter
- Add support for forwarding signals
- Fix bug that caused truncated messages on large sends over TCP BTL
- Fix potential infinite loop when printing a stacktrace


1.10.5 - 19 Dec 2016
------
- Update UCX APIs
- Fix bug in darray that caused MPI/IO failures
- Use a MPI_Get_library_version() like string to tag the debugger DLL.
  Thanks to Alastair McKinstry for the report
- Fix multi-threaded race condition in coll/libnbc
- Several fixes to OSHMEM
- Fix bug in UCX support due to uninitialized field
- Fix MPI_Ialltoallv with MPI_IN_PLACE and without MPI param check
- Correctly reset receive request type before init. Thanks Chris Pattison
  for the report and test case.
- Fix bug in iallgather[v]
- Fix concurrency issue with MPI_Comm_accept. Thanks to Pieter Noordhuis
  for the patch
- Fix ompi_coll_base_{gather,scatter}_intra_binomial
- Fixed an issue with MPI_Type_get_extent returning the wrong extent
  for distributed array datatypes.
- Re-enable use of rtdtsc instruction as a monotonic clock source if
  the processor has a core-invariant tsc. This is a partial fix for a
  performance regression introduced in Open MPI v1.10.3.


1.10.4 - 01 Sept 2016
------

- Fix assembler support for MIPS
- Improve memory handling for temp buffers in collectives
- Fix [all]reduce with non-zero lower bound datatypes
  Thanks Hristo Iliev for the report
- Fix non-standard ddt handling. Thanks Yuki Matsumoto for the report
- Various libnbc fixes. Thanks Yuki Matsumoto for the report
- Fix typos in request RMA bindings for Fortran. Thanks to @alazzaro
  and @vondele for the assist
- Various bug fixes and enhancements to collective support
- Fix predefined types mapping in hcoll
- Revive the coll/sync component to resolve unexpected message issues
  during tight loops across collectives
- Fix typo in wrapper compiler for Fortran static builds


1.10.3 - 15 June 2016
------

- Fix zero-length datatypes.  Thanks to Wei-keng Liao for reporting
  the issue.
- Minor manpage cleanups
- Implement atomic support in OSHMEM/UCX
- Fix support of MPI_COMBINER_RESIZED. Thanks to James Ramsey
  for the report
- Fix computation of #cpus when --use-hwthread-cpus is used
- Add entry points for Allgatherv, iAllgatherv, Reduce, and iReduce
  for the HCOLL library
- Fix an HCOLL integration bug that could signal completion of request
  while still being worked
- Fix computation of cores when SMT is enabled. Thanks to Ben Menadue
  for the report
- Various USNIC fixes
- Create a datafile in the per-proc directory in order to make it
  unique per communicator. Thanks to Peter Wind for the report
- Fix zero-size malloc in one-sided pt-to-pt code. Thanks to Lisandro
  Dalcín for the report
- Fix MPI_Get_address when passed MPI_BOTTOM to not return an error.
  Thanks to Lisandro Dalcín for the report
- Fix MPI_TYPE_SET_ATTR with NULL value. Thanks to Lisandro Dalcín for
  the report
- Fix various Fortran08 binding issues
- Fix memchecker no-data case. Thanks to Clinton Stimpson for the report
- Fix CUDA support under OS-X
- Fix various OFI/MTL integration issues
- Add MPI_T man pages
- Fix one-sided pt-to-pt issue by preventing communication from happening
  before a target enters a fence, even in the no-precede case
- Fix a bug that disabled Totalview for MPMD use-case
- Correctly support MPI_UNWEIGHTED in topo-graph-neighbors. Thanks to
  Jun Kudo for the report
- Fix singleton operations under SLURM when PMI2 is enabled
- Do not use MPI_IN_PLACE in neighborhood collectives for non-blocking
  collectives (libnbc). Thanks to Jun Kudo for the report
- Silence autogen deprecation warnings for newer versions of Perl
- Do not return MPI_ERR_PENDING from collectives
- Use type int* for MPI_WIN_DISP_UNIT, MPI_WIN_CREATE_FLAVOR, and MPI_WIN_MODEL.
  Thanks to Alastair McKinstry for the report
- Fix register_datarep stub function in IO/OMPIO. Thanks to Eric
  Chamberland for the report
- Fix a bus error on MPI_WIN_[POST,START] in the shared memory one-sided component
- Add several missing MPI_WIN_FLAVOR constants to the Fortran support
- Enable connecting processes from different subnets using the openib BTL
- Fix bug in basic/barrier algorithm in OSHMEM
- Correct process binding for the --map-by node case
- Include support for subnet-to-subnet routing over InfiniBand networks
- Fix usnic resource check
- AUTHORS: Fix an errant reference to Subversion IDs
- Fix affinity for MPMD jobs running under LSF
- Fix many Fortran binding bugs
- Fix `MPI_IN_PLACE`-related bugs
- Fix PSM/PSM2 support for singleton operations
- Ensure MPI transports continue to progress during RTE barriers
- Update HWLOC to 1.9.1 end-of-series
- Fix a bug in the Java command line parser when the
  -Djava.library.path options was given by the user
- Update the MTL/OFI provider selection behavior
- Add support for clock_gettime on Linux.
- Correctly detect and configure for Solaris Studio 12.5
  beta compilers
- Correctly compute #slots when -host is used for MPMD case
- Fix a bug in the hcoll collectives due to an uninitialized field
- Do not set a binding policy when oversubscribing a node
- Fix hang in intercommunicator operations when oversubscribed
- Speed up process termination during MPI_Abort
- Disable backtrace support by default in the PSM/PSM2 libraries to
  prevent unintentional conflicting behavior.



1.10.2: 26 Jan 2016
-------------------

 **********************************************************************
 *  OSHMEM is now 1.2 compliant
 **********************************************************************

- Fix NBC_Copy for legitimate zero-size messages
- Fix multiple bugs in OSHMEM
- Correctly handle mpirun --host <user>@<ip-address>
- Centralize two MCA params to avoid duplication between OMPI and
  OSHMEM layers: opal_abort_delay and opal_abort_print_stack
- Add support for Fujitsu compilers
- Add UCX support for OMPI and OSHMEM
- Correctly handle oversubscription when not given directives
  to permit it. Thanks to @ammore1 for reporting it
- Fix rpm spec file to not include the /usr directory
- Add Intel HFI1 default parameters for the openib BTL
- Resolve symbol conflicts in the PSM2 library
- Add ability to empty the rgpusm cache when full if requested
- Fix another libtool bug when -L requires a space between it
  and the path. Thanks to Eric Schnetter for the patch.
- Add support for OSHMEM v1.2 APIs
- Improve efficiency of oshmem_preconnect_all algorithm
- Fix bug in buffered sends support
- Fix double free in edge case of mpirun. Thanks to @jsharpe for
  the patch
- Multiple one-sided support fixes
- Fix integer overflow in the tuned "reduce" collective when
  using buffers larger than INT_MAX in size
- Fix parse of user environment variables in mpirun. Thanks to
  Stefano Garzarella for the patch
- Performance improvements in PSM2 support
- Fix NBS iBarrier for inter-communicators
- Fix bug in vader BTL during finalize
- Improved configure support for Fortran compilers
- Fix rank_file mapper to support default --slot-set. Thanks
  to Matt Thompson for reporting it
- Update MPI_Testsome man page. Thanks to Eric Schnetter for
  the suggestion
- Fix missing resize of the returned type for subarray and
  darray types. Thanks to Keith Bennett and Dan Garmann for
  reporting it
- Fix Java support on OSX 10.11. Thanks to Alexander Daryin
  for reporting the problem
- Fix some compilation issues on Solaris 11.2. Thanks to
  Paul Hargrove for his continued help in such areas


1.10.1: 4 Nov 2015
------------------

- Workaround an optimization problem with gcc compilers >= 4.9.2 that
  causes problems with memory registration, and forced
  mpi_leave_pinned to default to 0 (i.e., off).  Thanks to @oere for
  the fix.
- Fix use of MPI_LB and MPI_UB in subarray and darray datatypes.
  Thanks to Gus Correa and Dimitar Pashov for pointing out the issue.
- Minor updates to mpi_show_mpi_alloc_mem_leaks and
  ompi_debug_show_handle_leaks functionality.
- Fix segv when invoking non-blocking reductions with a user-defined
  operation.  Thanks to Rupert Nash and Georg Geiser for identifying
  the issue.
- No longer probe for PCI topology on Solaris (unless running as root).
- Fix for Intel Parallel Studio 2016 ifort partial support of the
  !GCC$ pragma.  Thanks to Fabrice Roy for reporting the problem.
- Bunches of Coverity / static analysis fixes.
- Fixed ROMIO to look for lstat in <sys/stat.h>.  Thanks to William
  Throwe for submitting the patch both upstream and to Open MPI.
- Fixed minor memory leak when attempting to open plugins.
- Fixed type in MPI_IBARRIER C prototype.  Thanks to Harald Servat for
  reporting the issue.
- Add missing man pages for MPI_WIN_CREATE_DYNAMIC, MPI_WIN_ATTACH,
  MPI_WIN_DETACH, MPI_WIN_ALLOCATE, MPI_WIN_ALLOCATE_SHARED.
- When mpirun-launching new applications, only close file descriptors
  that are actually open (resulting in a faster launch in some
  environments).
- Fix "test ==" issues in Open MPI's configure script.  Thank to Kevin
  Buckley for pointing out the issue.
- Fix performance issue in usnic BTL: ensure progress thread is
  throttled back to not aggressively steal CPU cycles.
- Fix cache line size detection on POWER architectures.
- Add missing #include in a few places.  Thanks to Orion Poplawski for
  supplying the patch.
- When OpenSHMEM building is disabled, no longer install its header
  files, help files, or man pages.  Add man pages for oshrun, oshcc,
  and oshfort.
- Fix mpi_f08 implementations of MPI_COMM_SET_INFO, and profiling
  versions of MPI_BUFFER_DETACH, MPI_WIN_ALLOCATE,
  MPI_WIN_ALLOCATE_SHARED, MPI_WTICK, and MPI_WTIME.
- Add orte_rmaps_dist_device MCA param, allowing users to map near a
  specific device.
- Various updates/fixes to the openib BTL.
- Add missing defaults for the Mellanox ConnectX 3 card to the openib BTL.
- Minor bug fixes in the OFI MTL.
- Various updates to Mellanox's MXM, hcoll, and FCA components.
- Add OpenSHMEM man pages.  Thanks to Tony Curtis for sharing the man
  pages files from openshmem.org.
- Add missing "const" attributes to MPI_COMPARE_AND_SWAP,
  MPI_FETCH_AND_OP, MPI_RACCUMULATE, and MPI_WIN_DETACH prototypes.
  Thanks to Michael Knobloch and Takahiro Kawashima for bringing this
  to our attention.
- Fix linking issues on some platforms (e.g., SLES 12).
- Fix hang on some corner cases when MPI applications abort.
- Add missing options to mpirun man page. Thanks to Daniel Letai
  for bringing this to our attention.
- Add new --with-platform-patches-dir configure option
- Adjust relative selection priorities to ensure that MTL
  support is favored over BTL support when both are available
- Use CUDA IPC for all sized messages for performance


1.10.0: 25 Aug 2015
-------------------

** NOTE: The v1.10.0 release marks the transition to Open MPI's new
** version numbering scheme.  The v1.10.x release series is based on
** the v1.8.x series, but with a few new features.  v2.x will be the
** next series after the v1.10.x series, and complete the transition
** to the new version numbering scheme.  See README for more details
** on the new versioning scheme.
**
** NOTE: In accordance with OMPI version numbering, the v1.10 is *not*
** API compatible with the v1.8 release series.

- Added libfabric support (see README for more details):
  - usNIC BTL updated to use libfabric.
  - Added OFI MTL (usable with PSM in libfabric v1.1.0).
- Added Intel Omni-Path support via new PSM2 MTL.
- Added "yalla" PML for faster MXM support.
- Removed support for MX
- Added persistent distributed virtual machine (pDVM) support for fast
  workflow executions.
- Fixed typo in GCC inline assembly introduced in Open MPI v1.8.8.
  Thanks to Paul Hargrove for pointing out the issue.
- Add missing man pages for MPI_Win_get|set_info(3).
- Ensure that session directories are cleaned up at the end of a run.
- Fixed linking issues on some OSs where symbols of dependent
  libraries are not automatically publicly available.
- Improve hcoll and fca configury library detection.  Thanks to David
  Shrader for helping track down the issue.
- Removed the LAMA mapper (for use in setting affinity).  Its
  functionality has been largely superseded by other mpirun CLI
  options.
- CUDA: Made the asynchronous copy mode be the default.
- Fix a malloc(0) warning in MPI_IREDUCE_SCATTER_BLOCK.  Thanks to
  Lisandro Dalcín for reporting the issue.
- Fix typo in MPI_Scatter(3) man page.  Thanks to Akshay Venkatesh for
  noticing the mistake.
- Add rudimentary protection from TCP port scanners.
- Fix typo in Open MPI error handling.  Thanks to Åke Sandgren for
  pointing out the error.
- Increased the performance of the CM PML (i.e., the Portals, PSM,
  PSM2, MXM, and OFI transports).
- Restored visibility of blocking send requests in message queue
  debuggers (e.g., TotalView, DDT).
- Fixed obscure IPv6-related bug in the TCP BTL.
- Add support for the "no_locks" MPI_Info key for one-sided
  functionality.
- Fixed ibv_fork support for verbs-based networks.
- Fixed a variety of small bugs in OpenSHMEM.
- Fixed MXM configure with additional CPPFLAGS and LDFLAGS.  Thanks to
  David Shrader for the patch.
- Fixed incorrect memalign threshhold in the openib BTL.  Thanks to
  Xavier Besseron for pointing out the issue.


1.8.8: 5 Aug 2015
-----------------

- Fix a segfault in MPI_FINALIZE with the PSM MTL.
- Fix mpi_f08 sentinels (e.g., MPI_STATUS_IGNORE) handling.
- Set some additional MXM default values for OSHMEM.
- Fix an invalid memory access in MPI_MRECV and MPI_IMRECV.
- Include two fixes that were mistakenly left out of the official
  v1.8.7 tarball:
  - Fixed MPI_WIN_POST and MPI_WIN_START for zero-size messages
  - Protect the OOB TCP ports from segfaulting when accessed by port
    scanners


1.8.7: 15 Jul 2015
------------------

** NOTE: v1.8.7 technically breaks ABI with prior versions
** in the 1.8 series because it repairs two incorrect API
** signatures. However, users will only need to recompile
** if they were using those functions - which they couldn't
** have been, because the signatures were wrong :-)

- Plugged a memory leak that impacted blocking sends
- Fixed incorrect declaration for MPI_T_pvar_get_index and added
  missing return code MPI_T_INVALID_NAME.
- Fixed an uninitialized variable in PMI2 support
- Added new vendor part id for Mellanox ConnectX4-LX
- Fixed NBC_Copy for legitimate zero-size messages
- Fixed MPI_Win_post and MPI_Win_start for zero-size messages
- Protect the OOB ports from segfaulting when accessed by port scanners
- Fixed several Fortran typos
- Fixed configure detection of XRC support
- Fixed support for highly heterogeneous systems to avoid
  memory corruption when printing out the bindings

1.8.6: 17 Jun 2015
------------------

- Fixed memory leak on Mac OS-X exposed by TCP keepalive
- Fixed keepalive support to ensure that daemon/node failure
  results in complete job cleanup
- Update Java binding support
- Fixed MPI_THREAD_MULTIPLE bug in vader shared memory BTL
- Fixed issue during shutdown when CUDA initialization wasn't complete
- Fixed orted environment when no prefix given
- Fixed trivial typo in MPI_Neighbor_allgather manpage
- Fixed tree-spawn support for sh and ksh shells
- Several data type fixes
- Fixed IPv6 support bug
- Cleaned up an unlikely build issue
- Fixed PMI2 process map parsing for cyclic mappings
- Fixed memalign threshold in openib BTL
- Fixed debugger access to message queues for blocking send/recv


1.8.5: 5 May 2015
-----------------

- Fixed configure problems in some cases when using an external hwloc
  installation.  Thanks to Erick Schnetter for reporting the error and
  helping track down the source of the problem.
- Fixed linker error on OS X when using the clang compiler.  Thanks to
  Erick Schnetter for reporting the error and helping track down the
  source of the problem.
- Fixed MPI_THREAD_MULTIPLE deadlock error in the vader BTL.  Thanks
  to Thomas Klimpel for reporting the issue.
- Fixed several Valgrind warnings.  Thanks for Lisandro Dalcín for
  contributing a patch fixing some one-sided code paths.
- Fixed version compatibility test in OOB that broke ABI within the
  1.8 series. NOTE: this will not resolve the problem between pre-1.8.5
  versions, but will fix it going forward.
- Fix some issues related to running on Intel Xeon Phi coprocessors.
- Opportunistically switch away from using GNU Libtool's libltdl
  library when possible (by default).
- Fix some VampirTrace errors.  Thanks to Paul Hargrove for reporting
  the issues.
- Correct default binding patterns when --use-hwthread-cpus was
  specified and nprocs <= 2.
- Fix warnings about -finline-functions when compiling with clang.
- Updated the embedded hwloc with several bug fixes, including the
  "duplicate Lhwloc1 symbol" that multiple users reported on some
  platforms.
- Do not error when mpirun is invoked with with default bindings
  (i.e., no binding was specified), and one or more nodes do not
  support bindings.  Thanks to Annu Desari for pointing out the
  problem.
- Let root invoke "mpirun --version" to check the version without
  printing the "Don't run as root!" warnings.  Thanks to Robert McLay
  for the suggestion.
- Fixed several bugs in OpenSHMEM support.
- Extended vader shared memory support to 32-bit architectures.
- Fix handling of very large datatypes.  Thanks to Bogdan Sataric for
  the bug report.
- Fixed a bug in handling subarray MPI datatypes, and a bug when using
  MPI_LB and MPI_UB.  Thanks to Gus Correa for pointing out the issue.
- Restore user-settable bandwidth and latency PML MCA variables.
- Multiple bug fixes for cleanup during MPI_FINALIZE in unusual
  situations.
- Added support for TCP keepalive signals to ensure timely termination
  when sockets between daemons cannot be created (e.g., due to a
  firewall).
- Added MCA parameter to allow full use of a SLURM allocation when
  started from a tool (supports LLNL debugger).
- Fixed several bugs in the configure logic for PMI and hwloc.
- Fixed incorrect interface index in TCP communications setup.  Thanks
  to Mark Kettenis for spotting the problem and providing a patch.
- Fixed MPI_IREDUCE_SCATTER with single-process communicators when
  MPI_IN_PLACE was not used.
- Added XRC support for OFED v3.12 and higher.
- Various updates and bug fixes to the Mellanox hcoll collective
  support.
- Fix problems with Fortran compilers that did not support
  REAL*16/COMPLEX*32 types.  Thanks to Orion Poplawski for identifying
  the issue.
- Fixed problem with rpath/runpath support in pkg-config files.
  Thanks to Christoph Junghans for notifying us of the issue.
- Man page fixes:
  - Removed erroneous "color" discussion from MPI_COMM_SPLIT_TYPE.
    Thanks to Erick Schnetter for spotting the outdated text.
  - Fixed prototypes for MPI_IBARRIER.  Thanks to Maximilian for
    finding the issue.
  - Updated docs about buffer usage in non-blocking communications.
    Thanks to Alexander Pozdneev for citing the outdated text.
  - Added documentation about the 'ompi_unique' MPI_Info key with
    MPI_PUBLISH_NAME.
  - Fixed typo in MPI_INTERCOMM_MERGE.  Thanks to Harald Servat for
    noticing and sending a patch.
  - Updated configure paths in HACKING.  Thanks to Maximilien Levesque
    for the fix.
  - Fixed Fortran typo in MPI_WIN_LOCK_ALL.  Thanks to Thomas Jahns
    for pointing out the issue.
- Fixed a number of MPI one-sided bugs.
- Fixed MPI_COMM_SPAWN when invoked from a singleton job.
- Fixed a number of minor issues with CUDA support, including
  registering of shared memory and supporting reduction support for
  GPU buffers.
- Improved support for building OMPI on Cray platforms.
- Fixed performance regression introduced by the inadvertent default
  enabling of MPI_THREAD_MULTIPLE support.


1.8.4: 19 Dec 2014
------------------

- Fix MPI_SIZEOF; now available in mpif.h for modern Fortran compilers
  (see README for more details).  Also fixed various compiler/linker
  errors.
- Fixed inadvertant Fortran ABI break between v1.8.1 and v1.8.2 in the
  mpi interface module when compiled with gfortran >= v4.9.
- Fix various MPI_THREAD_MULTIPLE issues in the TCP BTL.
- mpirun no longer requires the --hetero-nodes switch; it will
  automatically detect when running in heterogeneous scenarios.
- Update LSF support, to include revamped affinity functionality.
- Update embedded hwloc to v1.9.1.
- Fixed max registerable memory computation in the openib BTL.
- Updated error message when debuggers are unable to find various
  symbols/types to be more clear.  Thanks to Dave Love for raising the
  issue.
- Added proper support for LSF and PBS/Torque libraries in static builds.
- Rankfiles now support physical processor IDs.
- Fixed potential hang in MPI_ABORT.
- Fixed problems with the PSM MTL and "re-connect" scenarios, such as
  MPI_INTERCOMM_CREATE.
- Fix MPI_IREDUCE_SCATTER with a single process.
- Fix (rare) race condition in stdout/stderr funneling to mpirun where
  some trailing output could get lost when a process terminated.
- Removed inadvertent change that set --enable-mpi-thread-multiple "on"
  by default, thus impacting performance for non-threaded apps.
- Significantly reduced startup time by optimizing internal hash table
  implementation.
- Fixed OS X linking with the Fortran mpi module when used with
  gfortran >= 4.9.  Thanks to Github user yafshar for raising the
  issue.
- Fixed memory leak on Cygwin platforms.  Thanks for Marco Atzeri for
  reporting the issue.
- Fixed seg fault in neighborhood collectives when the degree of the
  topology is higher than the communicator size.  Thanks to Lisandro
  Dalcín for reporting the issue.
- Fixed segfault in neighborhood collectives under certain use-cases.
- Fixed various issues regarding Solaris support.  Thanks to Siegmar
  Gross for patiently identifying all the issues.
- Fixed PMI configure tests for certain Slurm installation patterns.
- Fixed param registration issue in Java bindings.  Thanks to Takahiro
  Kawashima and Siegmar Gross for identifying the issue.
- Several man page fixes.
- Silence several warnings and close some memory leaks (more remain,
  but it's better than it was).
- Re-enabled the use of CMA and knem in the shared memory BTL.
- Updated mpirun manpage to correctly explain new map/rank/binding options.
- Fixed MPI_IALLGATHER problem with intercommunicators.  Thanks for
  Takahiro Kawashima for the patch.
- Numerous updates and performance improvements to OpenSHMEM.
- Turned off message coalescing in the openib BTL until a proper fix
  for that capability can be provided (tentatively expected for 1.8.5)
- Fix a bug in iof output that dates back to the dinosaurs which would
  output extra bytes if the system was very heavily loaded
- Fix a bug where specifying mca_component_show_load_errors=0 could
  cause ompi_info to segfault
- Updated valgrind suppression file


1.8.3: 26 Sep 2014
------------------

- Fixed application abort bug to ensure that MPI_Abort exits appropriately
  and returns the provided exit status
- Fixed some alignment (not all) issues identified by Clang
- Allow CUDA-aware to work with nonblocking collectives. Forces packing to
  happen when using GPU buffers.
- Fixed configure test issue with Intel 2015 Fortran compiler
- Fixed some PGI-related errors
- Provide better help message when encountering a firewall
- Fixed MCA parameter quoting to protect multi-word params and params
  that contain special characters
- Improved the bind-to help message to clarify the defaults
- Add new MPI-3.1 tools interface
- Several performance optimizations and memory leak cleanups
- Turn off the coll/ml plugin unless specifically requested as it
  remains in an experimental state
- Fix LSF support by adding required libraries for the latest LSF
  releases.  Thanks to Joshua Randal for supplying the initial
  patches.


1.8.2: 25 Aug 2014
------------------

- Fix auto-wireup of OOB, allowing ORTE to automatically
  test all available NICs
- "Un-deprecate" pernode, npernode, and npersocket options
  by popular demand
- Add missing Fortran bindings for MPI_WIN_LOCK_ALL,
  MPI_WIN_UNLOCK_ALL, and MPI_WIN_SYNC.
- Fix cascading/over-quoting in some cases with the rsh/ssh-based
  launcher.  Thanks to multiple users for raising the issue.
- Properly add support for gfortran 4.9 ignore TKR pragma (it was
  erroneously only partially added in v1.7.5).  Thanks to Marcus
  Daniels for raising the issue.
- Update/improve help messages in the usnic BTL.
- Resolve a race condition in MPI_Abort.
- Fix obscure cases where static linking from wrapper compilers would
  fail.
- Clarify the configure --help message about when OpenSHMEM is
  enabled/disabled by default.  Thanks to Paul Hargrove for the
  suggestion.
- Align pages properly where relevant.  Thanks to Paul Hargrove for
  identifying the issue.
- Various compiler warning and minor fixes for OpenBSD, FreeBSD, and
  Solaris/SPARC.  Thanks to Paul Hargrove for the patches.
- Properly pass function pointers from Fortran to C in the mpi_f08
  module, thereby now supporting gfortran 4.9.  Thanks to Tobias
  Burnus for assistance and testing with this issue.
- Improve support for Cray CLE 5.
- Fix mpirun regression: ensure exit status is non-zero if mpirun is
  terminated due to signal.
- Improved CUDA efficiency of asynchronous copies.
- Fix to parameter type in MPI_Type_indexed.3.  Thanks to Bastian
  Beischer for reporting the mistake.
- Fix NUMA distance calculations in the openib BTL.
- Decrease time required to shut down mpirun at the end of a job.
- More RMA fixes.
- More hostfile fixes from Tetsuya Mishima.
- Fix darray issue where UB was not computed correctly.
- Fix mpi_f08 parameter name for MPI_GET_LIBRARY_VERSION.  Thanks to
  Junchao Zhang for pointing out the issue.
- Ensure mpirun aborts properly when unable to map processes in
  scheduled environments.
- Ensure that MPI RMA error codes show up properly.  Thanks to
  Lisandro Dalcín for reporting the issue.
- Minor bug fixes and improvements to the bash and zsh mpirun
  autocompletion scripts.
- Fix sequential mpirun process mapper.  Thanks to Bill Chen for
  reporting the issue.
- Correct SLURM stdout/stderr redirection.
- Added missing portals 4 files.
- Performance improvements for blocking sends and receives.
- Lots of cleanup to the ml collective component
- Added new Java methods to provide full MPI coverage
- Many OSHMEM cleanups
- Prevent comm_spawn from automatically launching a VM across
  all available nodes
- Close many memory leaks to achieve valgrind-clean operation
- Better handling of TCP connection discovery for mismatched networks
  where we don't have a direct 1:1 subnet match between nodes
- Prevent segfault when OMPI info tools are used in pipes and user
  exits one step of that pipe before completing output


1.8.1: 23 Apr 2014
------------------

- Fix for critical bug: mpirun removed files (but not directories)
  from / when run as root.  Thanks to Jay Fenlason and Orion Poplawski
  for bringing the issue to our attention and helping identify the
  fix.


1.8: 31 Mar 2014
----------------

- Commit upstream ROMIO fix for mixed NFS+local filesystem environments.
- Several fixes for MPI-3 one-sided support.  For example,
  arbitrary-length datatypes are now supported.
- Add config support for the Mellanox ConnectX 4 card.
- Add missing MPI_COMM_GET|SET_INFO functions, and missing
  MPI_WEIGHTS_EMPTY and MPI_ERR_RMA_SHARED constants.  Thanks to
  Lisandro Dalcín for pointing out the issue.
- Update some help messages in OSHMEM, the usnic BTL, the TCP BTL, and
  ORTE, and update documentation about ompi_info's --level option.
- Fix some compiler warnings.
- Ensure that ORTE daemons are not bound to a single processor
  if TaskAffinity is set on by default in Slurm. Thanks to Artem Polyakov
  for identifying the problem and providing a patch


1.7.5 20 Mar 2014
-----------------

 **********************************************************************
 *  Open MPI is now fully MPI-3.0 compliant
 **********************************************************************

- Add Linux OpenSHMEM support built on top of Open MPI's MPI
  layer. Thanks to Mellanox for contributing this new feature.
- Allow restricting ORTE daemons to specific cores using the
  orte_daemon_cores MCA param.
- Ensure to properly set "locality" flags for processes launched via
  MPI dynamic functions such as MPI_COMM_SPAWN.
- Fix MPI_GRAPH_CREATE when nnodes is smaller than the size of the old
  communicator.
- usnic BTL now supports underlying UDP transport.
- usnic BTL now checks for common connectivty errors at first send to
  a remote server.
- Minor scalability improvements in the usnic BTL.
- ompi_info now lists whether the Java MPI bindings are available or not.
- MPI-3: mpi.h and the Fortran interfaces now report MPI_VERSION==3
  and MPI_SUBVERSION==0.
- MPI-3: Added support for new RMA functions and functionality.
- Fix MPI_Info "const buglet.  Thanks to Orion Poplawski for
  identifying the issue.
- Multiple fixes to mapping/binding options. Thanks to Tetsuya Mishima
  for his assistance.
- Multiple fixes for normal and abnormal process termination,
  including singleton MPI_Abort and ensuring to kill entire process
  groups when abnormally terminating a job.
- Fix DESTDIR install for javadocs.  Thanks to Orion Poplawski for
  pointing out the issue.
- Various performance improvements for the MPI Java bindings.
- OMPI now uses its own internal random number generator and will not
  perturb srand() and friends.
- Some cleanups for Cygwin builds.  Thanks to Marco Atzeri for the
  patches.
- Add a new collective component (coll/ml) that provides substantially
  improved performance.  It is still experimental, and requires
  setting coll_ml_priority > 0 to become active.
- Add version check during startup to ensure you are using the same
  version of Open MPI on all nodes in a job.
- Significantly improved the performance of MPI_DIMS_CREATE for large
  values.  Thanks to Andreas Schäfer for the contribution.
- Removed ASYNCHRONOUS keyword from the "ignore TKR" mpi_f08 module.
- Deprecated the following mpirun options:
  --bynode, --bycore, --byslot: replaced with --map-by node|core|slot.
  --npernode, --npersocket: replaced with --map-by ppr:N:node and
       --map-by ppr:N:socket, respectively
- Pick NFS "infinitely stale" fix from ROMIO upstream.
- Various PMI2 fixes and extension to support broader range of mappings.
- Improve launch performance at large scale.
- Add support for PBS/Torque environments that set environment
  variables to indicate the number of slots available on each nodes.
  Set the ras_tm_smp MCA parameter to "1" to enable this mode.
- Add new, more scalable endpoint exchange (commonly called "modex")
  method that only exchanges endpoint data on a per-peer basis
  on first message. Not all transports have been updated to use
  this feature. Set the rte_orte_direct_modex parameter to "1"
  to enable this mode.


1.7.4: 5 Feb 2014
-----------------

 **********************************************************************
 *      CRITICAL CHANGE
 *
 * As of release 1.7.4, OpenMPI's default mapping, ranking, and binding
 * settings have changed:
 *
 * Mapping:
 *   if #procs <= 2, default to map-by core
 *   if #procs > 2, default to map-by socket
 * Ranking:
 *   if default mapping is used, then default to rank-by slot
 *   if map-by <obj> is given, then default to rank-by <obj>,
 *      where <obj> is whatever object we mapped against
 * Binding:
 *   default to bind-to core
 *
 * Users can override any of these settings individually using the
 * corresponding MCA parameter. Note that multi-threaded applications
 * in particular may want to override at least the binding default
 * to allow threads to use multiple cores.
 **********************************************************************

- Restore version number output in "ompi_info --all".
- Various bug fixes for the mpi_f08 Fortran bindings.
- Fix ROMIO compile error with Lustre 2.4.  Thanks to Adam Moody for
  reporting the issue.
- Various fixes for 32 bit platforms.
- Add ability to selectively disable building the mpi or mpi_f08
  module.  See the README file for details.
- Fix MX MTL finalization issue.
- Fix ROMIO issue when opening a file with MPI_MODE_EXCL.
- Fix PowerPC and MIPS assembly issues.
- Various fixes to the hcoll and FCA collective offload modules.
- Prevent integer overflow when creating datatypes.  Thanks to
  original patch from Gilles Gouaillardet.
- Port some upstream hwloc fixes to Open MPI's embedded copy for
  working around buggy NUMA node cpusets and including mising header
  files.  Thanks to Jeff Becker and Paul Hargrove for reporting the
  issues.
- Fix recursive invocation issues in the MXM MTL.
- Various bug fixes to the new MCA parameter back-end system.
- Have the posix fbtl module link against -laio on NetBSD platforms.
  Thanks to Paul Hargrove for noticing the issue.
- Various updates and fixes to network filesystem detection to support
  more operating systems.
- Add gfortran v4.9 "ignore TKR" syntax to the mpi Fortran module.
- Various compiler fixes for several BSD-based platforms.  Thanks to
  Paul Hargrove for reporting the issues.
- Fix when MPI_COMM_SPAWN[_MULTIPLE] is used on oversubscribed
  systems.
- Change the output from --report bindings to simply state that a
  process is not bound, instead of reporting that it is bound to all
  processors.
- Per MPI-3.0 guidance, remove support for all MPI subroutines with
  choice buffers from the TKR-based mpi Fortran module.  Thanks to Jed
  Brown for raising the issue.
- Only allow the usnic BTL to build on 64 bit platforms.
- Various bug fixes to SLURM support, to include ensuring proper
  exiting on abnormal termination.
- Ensure that MPI_COMM_SPAWN[_MULTIPLE] jobs get the same mapping
  directives that were used with mpirun.
- Fixed the application of TCP_NODELAY.
- Change the TCP BTL to not warn if a non-existent interface is
  ignored.
- Restored the "--bycore" mpirun option for backwards compatibility.
- Fixed debugger attach functionality.  Thanks to Ashley Pittman for
  reporting the issue and suggesting the fix.
- Fixed faulty MPI_IBCAST when invoked on a communicator with only
  one process.
- Add new Mellanox device IDs to the openib BTL.
- Progress towards cleaning up various internal memory leaks as
  reported by Valgrind.
- Fixed some annoying flex-generated warnings that have been there for
  years.  Thanks to Tom Fogal for the initial patch.
- Support user-provided environment variables via the "env" info key
  to MPI_COMM_SPAWN[_MULTIPLE].  Thanks to Tom Fogal for the feature
  request.
- Fix uninitialized variable in MPI_DIST_GRAPH_CREATE.
- Fix a variety of memory errors on SPARC platforms.  Thanks to
  Siegmar Gross for reporting and testing all the issues.
- Remove Solaris threads support.  When building on Solaris, pthreads
  will be used.
- Correctly handle the convertor internal stack for persistent
  receives.  Thanks to Guillaume Gouaillardet for identifying the
  problem.
- Add support for using an external libevent via --with-libevent.  See
  the README for more details.
- Various OMPIO updates and fixes.
- Add support for the MPIEXEC_TIMEOUT environment variable.  If set,
  mpirun will terminate the job after this many seconds.
- Update the internal copy of ROMIO to that which shipped in MPICH
  3.0.4.
- Various performance tweaks and improvements in the usnic BTL,
  including now reporting MPI_T performance variables for each usnic
  device.
- Fix to not access send datatypes for non-root processes with
  MPI_ISCATTER[V] and MPI_IGATHER[V].  Thanks to Pierre Jolivet for
  supplying the initial patch.
- Update VampirTrace to 5.14.4.9.
- Fix ptmalloc2 hook disable when used with ummunotify.
- Change the default connection manager for the openib BTL to be based
  on UD verbs data exchanges instead of ORTE OOB data exchanges.
- Fix Fortran compile error when compiling with 8-byte INTEGERs and
  4-byte ints.
- Fix C++11 issue identified by Jeremiah Willcock.
- Many changes, updates, and bug fixes to the ORTE run-time layer.
- Correctly handle MPI_REDUCE_SCATTER with recvcounts of 0.
- Update man pages for MPI-3, and add some missing man pages for
  MPI-2.x functions.
- Updated mpi_f08 module in accordance with post-MPI-3.0 errata which
  basically removed BIND(C) from all interfaces.
- Fixed MPI_IN_PLACE detection for MPI_SCATTER[V] in Fortran
  routines.  Thanks to Charles Gerlach for identifying the issue.
- Added support for routable RoCE to the openib BTL.
- Update embedded hwloc to v1.7.2.
- ErrMgr framework redesigned to better support fault tolerance development
  activities. See the following RFC for details:
  http://www.open-mpi.org/community/lists/devel/2010/03/7589.php
- Added database framework to OPAL and changed all modex operations
  to flow thru it, also included additional system info in the
  available data
- Added staged state machine to support sequential work flows
- Added distributed file system support for accessing files across
  nodes that do not have networked file systems
- Extended filem framework to support scalable pre-positioning of
  files for use by applications, adding new "raw" component that
  transmits files across the daemon network
- Native Windows support has been removed. A cygwin package is
  available from that group for Windows-based use.
- Added new MPI Java bindings.  See the Javadocs for more details on
  the API.
- Wrapper compilers now add rpath support by default to generated
  executables on systems that support it.  This behavior can be
  disabled via --disable-wrapper-rpath.  See note in README about ABI
  issues when using rpath in MPI applications.
- Added a new parallel I/O component and multiple new frameworks to
  support parallel I/O operations.
- Fixed MPI_STATUS_SIZE Fortran issue when used with 8-byte Fortran
  INTEGERs and 4-byte C ints.  Since this issue affects ABI, it is
  only enabled if Open MPI is configured with
  --enable-abi-breaking-fortran-status-i8-fix.  Thanks to Jim Parker
  for supplying the initial patch.
- Add support for Intel Phi SCIF transport.
- For CUDA-aware MPI configured with CUDA 6.0, use new pointer
  attribute to avoid extra synchronization in stream 0 when using
  CUDA IPC between GPUs on the same node.
- For CUDA-aware MPI configured with CUDA 6.0, compile in support
  of GPU Direct RDMA in openib BTL to improve small message latency.
- Updated ROMIO from MPICH v3.0.4.
- MPI-3: Added support for remaining non-blocking collectives.
- MPI-3: Added support for neighborhood collectives.
- MPI-3: Updated C bindings with consistent use of [].
- MPI-3: Added the const keyword to read-only buffers.
- MPI-3: Added support for non-blocking communicator duplication.
- MPI-3: Added support for non-collective communicator creation.


1.7.3: 17 Oct 2013
------------------

- Make CUDA-aware support dynamically load libcuda.so so CUDA-aware
  MPI library can run on systems without CUDA software.
- Fix various issues with dynamic processes and intercommunicator
  operations under Torque.  Thanks to Suraj Prabhakaran for reporting
  the problem.
- Enable support for the Mellanox MXM2 library by default.
- Improve support for Portals 4.
- Various Solaris fixes.  Many thanks to Siegmar Gross for his
  incredible patience in reporting all the issues.
- MPI-2.2: Add reduction support for MPI_C_*COMPLEX and MPI::*COMPLEX.
- Fixed internal accounting when openpty() fails.  Thanks to Michal
  Peclo for reporting the issue and providing a patch.
- Fixed too-large memory consumption in XRC mode of the openib BTL.
  Thanks to Alexey Ryzhikh for the patch.
- Add bozo check for negative np values to mpirun to prevent a
  deadlock.  Thanks to Upinder Malhi for identifying the issue.
- Fixed MPI_IS_THREAD_MAIN behavior.  Thanks to Lisandro Dalcín for
  pointing out the problem.
- Various rankfile fixes.
- Fix functionality over iWARP devices.
- Various memory and performance optimizations and tweaks.
- Fix MPI_Cancel issue identified by Fujitsu.
- Add missing support for MPI_Get_address in the "use mpi" TKR
  implementation.  Thanks to Hugo Gagnon for identifying the issue.
- MPI-3: Add support for MPI_Count.
- MPI-2.2: Add missing MPI_IN_PLACE support for MPI_ALLTOALL.
- Added new usnic BTL to support the Cisco usNIC device.
- Minor VampirTrace update to 5.14.4.4.
- Removed support for ancient OS X systems (i.e., prior to 10.5).
- Fixed obscure packing/unpacking datatype bug.  Thanks to Takahiro
  Kawashima for identifying the issue.
- Add run-time support for PMI2 environments.
- Update openib BTL default parameters to include support for Mellanox
  ConnectX3-Pro devices.
- Update libevent to v2.0.21.
- "ompi_info --param TYPE PLUGIN" now only shows a small number of MCA
  parameters by default.  Add "--level 9" or "--all" to see *all* MCA
  parameters.  See README for more details.
- Add support for asynchronous CUDA-aware copies.
- Add support for Mellanox MPI collective operation offload via the
  "hcoll" library.
- MPI-3: Add support for the MPI_T interface.  Open MPI's MCA
  parameters are now accessible via the MPI_T control variable
  interface.  Support has been added for a small number of MPI_T
  performance variables.
- Add Gentoo memory hooks override.  Thanks to Justin Bronder for the
  patch.
- Added new "mindist" process mapper, allowing placement of processes
  via PCI locality information reported by the BIOS.
- MPI-2.2: Add support for MPI_Dist_graph functionality.
- Enable generic, client-side support for PMI2 implementations. Can
  be leveraged by any resource manager that implements PMI2; e.g. SLURM,
  versions 2.6 and higher.

1.7.2: 26 Jun 2013
------------------

- Major VampirTrace update to 5.14.4.2.
  (** also appeared: 1.6.5)
- Fix to set flag==1 when MPI_IPROBE is called with MPI_PROC_NULL.
  (** also appeared: 1.6.5)
- Set the Intel Phi device to be ignored by default by the openib BTL.
  (** also appeared: 1.6.5)
- Decrease the internal memory storage used by intrinsic MPI datatypes
  for Fortran types.  Thanks to Takahiro Kawashima for the initial
  patch.
  (** also appeared: 1.6.5)
- Fix total registered memory calculation for Mellanox ConnectIB and
  OFED 2.0.
  (** also appeared: 1.6.5)
- Fix possible data corruption in the MXM MTL component.
  (** also appeared: 1.6.5)
- Remove extraneous -L from hwloc's embedding.  Thanks to Stefan
  Friedel for reporting the issue.
  (** also appeared: 1.6.5)
- Fix contiguous datatype memory check.  Thanks to Eric Chamberland
  for reporting the issue.
  (** also appeared: 1.6.5)
- Make the openib BTL more friendly to ignoring verbs devices that are
  not RC-capable.
  (** also appeared: 1.6.5)
- Fix some MPI datatype engine issues.  Thanks to Thomas Jahns for
  reporting the issue.
  (** also appeared: 1.6.5)
- Add INI information for Chelsio T5 device.
  (** also appeared: 1.6.5)
- Integrate MXM STREAM support for MPI_ISEND and MPI_IRECV, and other
  minor MXM fixes.
  (** also appeared: 1.6.5)
- Fix to not show amorphous "MPI was already finalized" error when
  failing to MPI_File_close an open file.  Thanks to Brian Smith for
  reporting the issue.
  (** also appeared: 1.6.5)
- Add a distance-based mapping component to find the socket "closest"
  to the PCI bus.
- Fix an error that caused epoll to automatically be disabled
  in libevent.
- Upgrade hwloc to 1.5.2.
- *Really* fixed XRC compile issue in Open Fabrics support.
- Fix MXM connection establishment flow.
- Fixed parallel debugger ability to attach to MPI jobs.
- Fixed some minor memory leaks.
- Fixed datatype corruption issue when combining datatypes of specific
  formats.
- Added Location Aware Mapping Algorithm (LAMA) mapping component.
- Fixes for MPI_STATUS handling in corner cases.
- Add a distance-based mapping component to find the socket "closest"
  to the PCI bus.


1.7.1: 16 Apr 2013
------------------

- Fixed compile error when --without-memory-manager was specified
  on Linux
- Fixed XRC compile issue in Open Fabrics support.


1.7: 1 Apr 2013
---------------

- Added MPI-3 functionality:
    - MPI_GET_LIBRARY_VERSION
    - Matched probe
    - MPI_TYPE_CREATE_HINDEXED_BLOCK
    - Non-blocking collectives
    - MPI_INFO_ENV support
    - Fortran '08 bindings (see below)
- Dropped support for checkpoint/restart due to loss of maintainer :-(
- Enabled compile-time warning of deprecated MPI functions by default
  (in supported compilers).
- Revamped Fortran MPI bindings (see the README for details):
  - "mpifort" is now the preferred wrapper compiler for Fortran
  - Added "use mpi_f08" bindings (for compilers that support it)
  - Added better "use mpi" support (for compilers that support it)
  - Removed incorrect MPI_SCATTERV interface from "mpi" module that
    was added in the 1.5.x series for ABI reasons.
- Lots of VampirTrace upgrades and fixes; upgrade to v5.14.3.
- Modified process affinity system to provide warning when bindings
  result in being "bound to all", which is equivalent to not being
  bound.
- Removed maffinity, paffinity, and carto frameworks (and associated
  MCA params).
- Upgraded to hwloc v1.5.1.
- Added performance improvements to the OpenIB (OpenFabrics) BTL.
- Made malloc hooks more friendly to IO interprosers.  Thanks to the
  bug report and suggested fix from Darshan maintainer Phil Carns.
- Added support for the DMTCP checkpoint/restart system.
- Added support for the Cray uGNI interconnect.
- Fixed header file problems on OpenBSD.
- Fixed issue with MPI_TYPE_CREATE_F90_REAL.
- Wrapper compilers now explicitly list/link all Open MPI libraries if
  they detect static linking CLI arguments.
- Open MPI now requires a C99 compiler to build.  Please upgrade your
  C compiler if you do not have a C99-compliant compiler.
- Fix MPI_GET_PROCESSOR_NAME Fortran binding to set ierr properly.
  Thanks to LANL for spotting the error.
- Many MXM and FCA updates.
- Fixed erroneous free of putenv'ed string that showed up in Valgrind
  reports.
- Fixed MPI_IN_PLACE case for MPI_ALLGATHER.
- Fixed a bug that prevented MCA params from being forwarded to
  daemons upon launch.
- Fixed issues with VT and CUDA --with-cuda[-libdir] configuration CLI
  parameters.
- Entirely new implementation of many MPI collective routines focused
  on better performance.
- Revamped autogen / build system.
- Add new sensor framework to ORTE that includes modules for detecting
  stalled applications and processes that consume too much memory.
- Added new state machine framework to ORTE that converts ORTE into an
  event-driven state machine using the event library.
- Added a new MCA parameter (ess_base_stream_buffering) that allows the user
  to override the system default for buffering of stdout/stderr streams
  (via setvbuf). Parameter is not visible via ompi_info.
- Revamped the launch system to allow consideration of node hardware
  in assigning process locations and bindings.
- Added the -novm option to preserve the prior launch behavior.
- Revamped the process mapping system to utilize node hardware by adding
  new map-by, rank-by, and bind-to cmd line options.
- Added new MCA parameter to provide protection against IO forwarding
  backlog.
- Dropped support for native Windows due to loss of maintainers. :-(
- Added a new parallel I/O component and multiple new frameworks to
  support parallel I/O operations.
- Fix typo in orte_setup_hadoop.m4. Thanks to Aleksej Saushev for
  reporting it
- Fix a very old error in opal_path_access(). Thanks to Marco Atzeri
  for chasing it down.


1.6.6: Not released
-------------------

- Prevent integer overflow in datatype creation.  Thanks to Gilles
  Gouaillardet for identifying the problem and providing a preliminary
  version of the patch.
- Ensure help-opal-hwloc-base.txt is included in distribution
  tarballs.  Thanks to Gilles Gouaillardet for supplying the patch.
- Correctly handle the invalid status for NULL and inactive requests.
  Thanks to KAWASHIMA Takahiro for submitting the initial patch.
- Fixed MPI_STATUS_SIZE Fortran issue when used with 8-byte Fortran
  INTEGERs and 4-byte C ints.  Since this issue affects ABI, it is
  only enabled if Open MPI is configured with
  --enable-abi-breaking-fortran-status-i8-fix.  Thanks to Jim Parker
  for supplying the initial patch.
- Fix datatype issue for sending from the middle of non-contiguous
  data.
- Fixed failure error with pty support.  Thanks to Michal Pecio for
  the patch.
- Fixed debugger support for direct-launched jobs.
- Fix MPI_IS_THREAD_MAIN to return the correct value.  Thanks to
  Lisandro Dalcín for pointing out the issue.
- Update VT to 5.14.4.4:
  - Fix C++-11 issue.
  - Fix support for building RPMs on Fedora with CUDA libraries.
- Add openib part number for ConnectX3-Pro HCA.
- Ensure to check that all resolved IP addresses are local.
- Fix MPI_COMM_SPAWN via rsh when mpirun is on a different server.
- Add Gentoo "sandbox" memory hooks override.


1.6.5: 26 Jun 2013
------------------

- Updated default SRQ parameters for the openib BTL.
  (** also to appear: 1.7.2)
- Major VampirTrace update to 5.14.4.2.
  (** also to appear: 1.7.2)
- Fix to set flag==1 when MPI_IPROBE is called with MPI_PROC_NULL.
  (** also to appear: 1.7.2)
- Set the Intel Phi device to be ignored by default by the openib BTL.
  (** also to appear: 1.7.2)
- Decrease the internal memory storage used by intrinsic MPI datatypes
  for Fortran types.  Thanks to Takahiro Kawashima for the initial
  patch.
  (** also to appear: 1.7.2)
- Fix total registered memory calculation for Mellanox ConnectIB and
  OFED 2.0.
  (** also to appear: 1.7.2)
- Fix possible data corruption in the MXM MTL component.
  (** also to appear: 1.7.2)
- Remove extraneous -L from hwloc's embedding.  Thanks to Stefan
  Friedel for reporting the issue.
  (** also to appear: 1.7.2)
- Fix contiguous datatype memory check.  Thanks to Eric Chamberland
  for reporting the issue.
  (** also to appear: 1.7.2)
- Make the openib BTL more friendly to ignoring verbs devices that are
  not RC-capable.
  (** also to appear: 1.7.2)
- Fix some MPI datatype engine issues.  Thanks to Thomas Jahns for
  reporting the issue.
  (** also to appear: 1.7.2)
- Add INI information for Chelsio T5 device.
  (** also to appear: 1.7.2)
- Integrate MXM STREAM support for MPI_ISEND and MPI_IRECV, and other
  minor MXM fixes.
  (** also to appear: 1.7.2)
- Improved alignment for OpenFabrics buffers.
- Fix to not show amorphous "MPI was already finalized" error when
  failing to MPI_File_close an open file.  Thanks to Brian Smith for
  reporting the issue.
  (** also to appear: 1.7.2)


1.6.4: 21 Feb 2013
------------------

- Fix Cygwin shared memory and debugger plugin support.  Thanks to
  Marco Atzeri for reporting the issue and providing initial patches.
- Fix to obtaining the correct available nodes when a rankfile is
  providing the allocation.  Thanks to Siegmar Gross for reporting the
  problem.
- Fix process binding issue on Solaris.  Thanks to Siegmar Gross for
  reporting the problem.
- Updates for MXM 2.0.
- Major VT update to 5.14.2.3.
- Fixed F77 constants for Cygwin/Cmake build.
- Fix a linker error when configuring --without-hwloc.
- Automatically provide compiler flags that compile properly on some
  types of ARM systems.
- Fix slot_list behavior when multiple sockets are specified.  Thanks
  to Siegmar Gross for reporting the problem.
- Fixed memory leak in one-sided operations.  Thanks to Victor
  Vysotskiy for letting us know about this one.
- Added performance improvements to the OpenIB (OpenFabrics) BTL.
- Improved error message when process affinity fails.
- Fixed MPI_MINLOC on man pages for MPI_REDUCE(_LOCAL).  Thanks to Jed
  Brown for noticing the problem and supplying a fix.
- Made malloc hooks more friendly to IO interprosers.  Thanks to the
  bug report and suggested fix from Darshan maintainer Phil Carns.
- Restored ability to direct launch under SLURM without PMI support.
- Fixed MPI datatype issues on OpenBSD.
- Major VT update to 5.14.2.3.
- Support FCA v3.0+.
- Fixed header file problems on OpenBSD.
- Fixed issue with MPI_TYPE_CREATE_F90_REAL.
- Fix an issue with using external libltdl installations.  Thanks to
  opolawski for identifying the problem.
- Fixed MPI_IN_PLACE case for MPI_ALLGATHER for FCA.
- Allow SLURM PMI support to look in lib64 directories.  Thanks to
  Guillaume Papaure for the patch.
- Restore "use mpi" ABI compatibility with the rest of the 1.5/1.6
  series (except for v1.6.3, where it was accidentally broken).
- Fix a very old error in opal_path_access(). Thanks to Marco Atzeri
  for chasing it down.


1.6.3: 30 Oct 2012
------------------

- Fix mpirun --launch-agent behavior when a prefix is specified.
  Thanks to Reuti for identifying the issue.
- Fixed memchecker configury.
- Brought over some compiler warning squashes from the development trunk.
- Fix spawning from a singleton to multiple hosts when the "add-host"
  MPI_Info key is used.  Thanks to Brian Budge for pointing out the
  problem.
- Add Mellanox ConnextIB IDs and max inline value.
- Fix rankfile when no -np is given.
- FreeBSD detection improvement.  Thanks to Brooks Davis for the
  patch.
- Removed TCP warnings on Windows.
- Improved collective algorithm selection for very large messages.
- Fix PSM MTL affinity settings.
- Fix issue with MPI_OP_COMMUTATIVE in the mpif.h bindings.  Thanks to
  Åke Sandgren for providing a patch to fix the issue.
- Fix issue with MPI_SIZEOF when using CHARACTER and LOGICAL types in
  the mpi module.  Thanks to Åke Sandgren for providing a patch to fix
  the issue.


1.6.2: 25 Sep 2012
------------------

- Fix issue with MX MTL.  Thanks to Doug Eadline for raising the issue.
- Fix singleton MPI_COMM_SPAWN when the result job spans multiple nodes.
- Fix MXM hang, and update for latest version of MXM.
- Update to support Mellanox FCA 2.5.
- Fix startup hang for large jobs.
- Ensure MPI_TESTANY / MPI_WAITANY properly set the empty status when
  count==0.
- Fix MPI_CART_SUB behavior of not copying periods to the new
  communicator properly.  Thanks to John Craske for the bug report.
- Add btl_openib_abort_not_enough_reg_mem MCA parameter to cause Open
  MPI to abort MPI jobs if there is not enough registered memory
  available on the system (vs. just printing a warning).  Thanks to
  Brock Palen for raising the issue.
- Minor fix to Fortran MPI_INFO_GET: only copy a value back to the
  user's buffer if the flag is .TRUE.
- Fix VampirTrace compilation issue with the PGI compiler suite.


1.6.1: 22 Aug 2012
------------------

- A bunch of changes to eliminate hangs on OpenFabrics-based networks.
  Users with Mellanox hardware are ***STRONGLY ENCOURAGED*** to check
  their registered memory kernel module settings to ensure that the OS
  will allow registering more than 8GB of memory.  See this FAQ item
  for details:

  http://www.open-mpi.org/faq/?category=openfabrics#ib-low-reg-mem

  - Fall back to send/receive semantics if registered memory is
    unavilable for RDMA.
  - Fix two fragment leaks when registered memory is exhausted.
  - Hueristically determine how much registered memory is available
    and warn if it's significantly less than all of RAM.
  - Artifically limit the amount of registered memory each MPI process
    can use to about 1/Nth to total registered memory available.
  - Improve error messages when events occur that are likely due to
    unexpected registered memory exhaustion.

- Fix double semicolon error in the C++ in <mpi.h>.  Thanks to John
  Foster for pointing out the issue.
- Allow -Xclang to be specified multiple times in CFLAGS.  Thanks to
  P. Martin for raising the issue.
- Break up a giant "print *" statement in the ABI-preserving incorrect
  MPI_SCATTER interface in the "large" Fortran "mpi" module.  Thanks
  to Juan Escobar for the initial patch.
- Switch the MPI_ALLTOALLV default algorithm to a pairwise exchange.
- Increase the openib BTL default CQ length to handle more types of
  OpenFabrics devices.
- Lots of VampirTrace fixes; upgrade to v5.13.0.4.
- Map MPI_2INTEGER to underlying MPI_INTEGERs, not MPI_INTs.
- Ensure that the OMPI version number is toleant of handling spaces.
  Thanks to dragonboy for identifying the issue.
- Fixed IN parameter marking on Fortran "mpi" module
  MPI_COMM_TEST_INTER interface.
- Various MXM improvements.
- Make the output of "mpirun --report-bindings" much more friendly /
  human-readable.
- Properly handle MPI_COMPLEX8|16|32.
- More fixes for mpirun's processor affinity options (--bind-to-core
  and friends).
- Use aligned memory for OpenFabrics registered memory.
- Multiple fixes for parameter checking in MPI_ALLGATHERV,
  MPI_REDUCE_SCATTER, MPI_SCATTERV, and MPI_GATHERV.  Thanks to the
  mpi4py community (Bennet Fauber, Lisandro Dalcín, Jonathan Dursi).
- Fixed file positioning overflows in MPI_FILE_GET_POSITION,
  MPI_FILE_GET_POSITION_SHARED, FILE_GET_SIZE, FILE_GET_VIEW.
- Removed the broken --cpu-set mpirun option.
- Fix cleanup of MPI errorcodes.  Thanks to Alexey Bayduraev for the
  patch.
- Fix default hostfile location.  Thanks to Götz Waschk for noticing
  the issue.
- Improve several error messages.


1.6: 14 May 2012
----------------

- Fix some process affinity issues.  When binding a process, Open MPI
  will now bind to all available hyperthreads in a core (or socket,
  depending on the binding options specified).
  --> Note that "mpirun --bind-to-socket ..." does not work on POWER6-
      and POWER7-based systems with some Linux kernel versions.  See
      the FAQ on the Open MPI web site for more information.
- Add support for ARM5 and ARM6 (in addition to the existing ARM7
  support).  Thanks to Evan Clinton for the patch.
- Minor Mellanox MXM fixes.
- Properly detect FDR10, FDR, and EDR OpenFabrics devices.
- Minor fixes to the mpirun(1) and MPI_Comm_create(3) man pages.
- Prevent segv if COMM_SPAWN_MULTIPLE fails.  Thanks to Fujitsu for
  the patch.
- Disable interposed memory management in fakeroot environments.  This
  fixes a problem in some build environments.
- Minor hwloc updates.
- Array versions of MPI_TEST and MPI_WAIT with a count==0 will now
  return immediately with MPI_SUCCESS.  Thanks to Jeremiah Willcock
  for the suggestion.
- Update VampirTrace to v5.12.2.
- Properly handle forwarding stdin to all processes when "mpirun
  --stdin all" is used.
- Workaround XLC assembly bug.
- OS X Tiger (10.4) has not been supported for a while, so forcibly
  abort configure if we detect it.
- Fix segv in the openib BTL when running on SPARC 64 systems.
- Fix some include file ordering issues on some BSD-based platforms.
  Thanks to Paul Hargove for this (and many, many other) fixes.
- Properly handle .FALSE. return parameter value to attribute copy
  callback functions.
- Fix a bunch of minor C++ API issues; thanks to Fujitsu for the patch.
- Fixed the default hostfile MCA parameter behavior.
- Per the MPI spec, ensure not to touch the port_name parameter to
  MPI_CLOSE_PORT (it's an IN parameter).


1.5.5: 27 Mar 2012
------------------

- Many, many portability configure/build fixes courtesy of Paul
  Hargrove.  Thanks, Paul!
- Fixed shared memory fault tolerance support compiler errors.
- Removed not-production-quality rshd and tmd PLM launchers.
- Minor updates to the Open MPI SRPM spec file.
- Fixed mpirun's --bind-to-socket option.
- A few MPI_THREAD_MULTIPLE fixes in the shared memory BTL.
- Upgrade the GNU Autotools used to bootstrap the 1.5/1.6 series to
  all the latest versions at the time of this release.
- Categorically state in the README that if you're having a problem
  with Open MPI with the Linux Intel 12.1 compilers, *upgrade your
  Intel Compiler Suite to the latest patch version*, and the problems
  will go away. :-)
- Fix the --without-memory-manager configure option.
- Fixes for Totalview/DDT MPI-capable debuggers.
- Update rsh/ssh support to properly handle the Mac OS X library path
  (i.e., DYLD_LIBRARY_PATH).
- Make warning about shared memory backing files on a networked file
  system be optional (i.e., can be disabled via MCA parameter).
- Several fixes to processor and memory affinity.
- Various shared memory infrastructure improvements.
- Various checkpoint/restart fixes.
- Fix MPI_IN_PLACE (and other MPI sentinel values) on OS X.  Thanks to
  Dave Goodell for providing the magic OS X gcc linker flags necessary.
- Various man page corrections and typo fixes.  Thanks to Fujitsu for
  the patch.
- Updated wrapper compiler man pages to list the various --showme
  options that are available.
- Add PMI direct-launch support (e.g., "srun mpi_application" under
  SLURM).
- Correctly compute the aligned address when packing the
  datatype description. Thanks to Fujitsu for the patch.
- Fix MPI obscure corner case handling in packing MPI datatypes.
  Thanks to Fujitsu for providing the patch.
- Workaround an Intel compiler v12.1.0 2011.6.233 vector optimization
  bug.
- Output the MPI API in ompi_info output.
- Major VT update to 5.12.1.4.
- Upgrade embedded Hardware Locality (hwloc) v1.3.2, plus some
  post-1.3.2-release bug fixes.  All processor and memory binding is
  now done through hwloc.  Woo hoo!  Note that this fixes core binding
  on AMD Opteron 6200 and 4200 series-based systems (sometimes known
  as Interlagos, Valencia, or other Bulldozer-based chips).
- New MCA parameters to control process-wide memory binding policy:
  hwloc_base_mem_alloc_policy, hwloc_base_mem_bind_failure_action (see
  ompi_info --param hwloc base).
- Removed direct support for libnuma.  Libnuma support may now be
  picked up through hwloc.
- Added MPI_IN_PLACE support to MPI_EXSCAN.
- Various fixes for building on Windows, including MinGW support.
- Removed support for the OpenFabrics IBCM connection manager.
- Updated Chelsio T4 and Intel NE OpenFabrics default buffer settings.
- Increased the default RDMA CM timeout to 30 seconds.
- Issue a warning if both btl_tcp_if_include and btl_tcp_if_exclude
  are specified.
- Many fixes to the Mellanox MXM transport.


1.5.4: 18 Aug 2011
------------------

- Add support for the (as yet unreleased) Mellanox MXM transport.
- Add support for dynamic service levels (SLs) in the openib BTL.
- Fixed C++ bindings cosmetic/warnings issue with
  MPI::Comm::NULL_COPY_FN and MPI::Comm::NULL_DELETE_FN.  Thanks to
  Júlio Hoffimann for identifying the issues.
- Also allow the word "slots" in rankfiles (i.e., not just "slot").
  (** also to appear in 1.4.4)
- Add Mellanox ConnectX 3 device IDs to the openib BTL defaults.
  (** also to appear in 1.4.4)
- Various FCA updates.
- Fix 32 bit SIGBUS errors on Solaris SPARC platforms.
- Add missing ARM assembly code files.
- Update to allow more than 128 entries in an appfile.
  (** also to appear in 1.4.4)
- Various VT updates and bug fixes.
- Update description of btl_openib_cq_size to be more accurate.
  (** also to appear in 1.4.4)
- Various assembly "clobber" fixes.
- Fix a hang in carto selection in obscure situations.
- Guard the inclusion of execinfo.h since not all platforms have it.  Thanks
  to Aleksej Saushev for identifying this issue.
  (** also to appear in 1.4.4)
- Support Solaris legacy munmap prototype changes.
  (** also to appear in 1.4.4)
- Updated to Automake 1.11.1 per
  http://www.open-mpi.org/community/lists/devel/2011/07/9492.php.
- Fix compilation of LSF support.
- Update MPI_Comm_spawn_multiple.3 man page to reflect what it
  actually does.
- Fix for possible corruption of the environment.  Thanks to Peter
  Thompson for the suggestion.  (** also to appear in 1.4.4)
- Enable use of PSM on direct-launch SLURM jobs.
- Update paffinity hwloc to v1.2, and to fix minor bugs affinity
  assignment bugs on PPC64/Linux platforms.
- Let the openib BTL auto-detect its bandwidth.
- Support new MPI-2.2 datatypes.
- Updates to support more datatypes in MPI one-sided communication.
- Fix recursive locking bug when MPI-IO was used with
  MPI_THREAD_MULTIPLE.  (** also to appear in 1.4.4)
- Fix mpirun handling of prefix conflicts.
- Ensure mpirun's --xterm options leaves sessions attached.
  (** also to appear in 1.4.4)
- Fixed type of sendcounts and displs in the "use mpi" F90 module.
  ABI is preserved, but applications may well be broken.  See the
  README for more details.  Thanks to Stanislav Sazykin for
  identifying the issue.  (** also to appear in 1.4.4)
- Fix indexed datatype leaks.  Thanks to Pascal Deveze for supplying
  the initial patch.  (** also to appear in 1.4.4)
- Fix debugger mapping when mpirun's -npernode option is used.
- Fixed support for configure's --disable-dlopen option when used with
  "make distclean".
- Fix segv associated with MPI_Comm_create with MPI_GROUP_EMPTY.
  Thanks to Dominik Goeddeke for finding this.
  (** also to appear in 1.4.4)
- Improved LoadLeveler ORTE support.
- Add new WinVerbs BTL plugin, supporting native OpenFabrics verbs on
  Windows (the "wv" BTL).
- Add new btl_openib_gid_index MCA parameter to allow selecting which
  GID to use on an OpenFabrics device's GID table.
- Add support for PCI relaxed ordering in the OpenFabrics BTL (when
  available).
- Update rsh logic to allow correct SGE operation.
- Ensure that the mca_paffinity_alone MCA parameter only appears once
  in the ompi_info output.  Thanks to Gus Correa for identifying the
  issue.
- Fixed return codes from MPI_PROBE and MPI_IPROBE.
  (** also to appear in 1.4.4)
- Remove --enable-progress-thread configure option; it doesn't work on
  the v1.5 branch.  Rename --enable-mpi-threads to
  --enable-mpi-thread-multiple.  Add new --enable-opal-multi-threads
  option.
- Updates for Intel Fortran compiler version 12.
- Remove bproc support.  Farewell bproc!
- If something goes wrong during MPI_INIT, fix the error
  message to say that it's illegal to invoke MPI_INIT before
  MPI_INIT.


1.5.3: 16 Mar 2011
------------------

- Add missing "affinity" MPI extension (i.e., the OMPI_Affinity_str()
  API) that was accidentally left out of the 1.5.2 release.


1.5.2: 9 Mar 2011
-----------------

- Replaced all custom topology / affinity code with initial support
  for hwloc v1.1.1 (PLPA has been removed -- long live hwloc!).  Note
  that hwloc is bundled with Open MPI, but an external hwloc can be
  used, if desired.  See README for more details.
- Many CMake updates for Windows builds.
- Updated opal_cr_thread_sleep_wait MCA param default value to make it
  less aggressive.
- Updated debugger support to allow Totalview attaching from jobs
  launched directly via srun (not mpirun).  Thanks to Nikolay Piskun
  for the patch.
- Added more FTB/CIFTS support.
- Fixed compile error with the PGI compiler.
- Portability fixes to allow the openib BTL to run on the Solaris
  verbs stack.
- Fixed multi-token command-line issues when using the mpirun
  --debug switch.  For example:
      mpirun --debug -np 2 a.out "foo bar"
  Thanks to Gabriele Fatigati for reporting the issue.
- Added ARM support.
- Added the MPI_ROOT environment variable in the Open MPI Linux SRPM
  for customers who use the BPS and LSF batch managers.
- Updated ROMIO from MPICH v1.3.1 (plus one additional patch).
- Fixed some deprecated MPI API function notification messages.
- Added new "bfo" PML that provides failover on OpenFabrics networks.
- Fixed some buffer memcheck issues in MPI_*_init.
- Added Solaris-specific chip detection and performance improvements.
- Fix some compile errors on Solaris.
- Updated the "rmcast" framework with bug fixes, new functionality.
- Updated the Voltaire FCA component with bug fixes, new
  functionality.  Support for FCA version 2.1.
- Fix gcc 4.4.x and 4.5.x over-aggressive warning notifications on
  possibly freeing stack variables.  Thanks to the Gentoo packagers
  for reporting the issue.
- Make the openib component be verbose when it disqualifies itself due
  to MPI_THREAD_MULTIPLE.
- Minor man page fixes.
- Various checkpoint / restart fixes.
- Fix race condition in the one-sided unlock code.  Thanks to
  Guillaume Thouvenin for finding the issue.
- Improve help message aggregation.
- Add OMPI_Affinity_str() optional user-level API function (i.e., the
  "affinity" MPI extension).  See README for more details.
- Added btl_tcp_if_seq MCA parameter to select a different ethernet
  interface for each MPI process on a node.  This parameter is only
  useful when used with virtual ethernet interfaces on a single
  network card (e.g., when using virtual interfaces give dedicated
  hardware resources on the NIC to each process).
- Changed behavior of mpirun to terminate if it receives 10 (or more)
  SIGPIPEs.
- Fixed oversubscription detection.
- Added new mtl_mx_board and mtl_mx_endpoint MCA parameters.
- Added ummunotify support for OpenFabrics-based transports.  See the
  README for more details.


1.5.1: 15 Dec 2010
------------------

- Fixes for the Oracle Studio 12.2 Fortran compiler.
- Fix SPARC and SPARCv9 atomics.  Thanks to Nicola Stange for the
  initial patch.
- Fix Libtool issues with the IBM XL compiler in 64-bit mode.
- Restore the reset of the libevent progress counter to avoid
  over-sampling the event library.
- Update memory barrier support.
- Use memmove (instead of memcpy) when necessary (e.g., source and
  destination overlap).
- Fixed ompi-top crash.
- Fix to handle Autoconf --program-transforms properly and other
  m4/configury updates.  Thanks to the GASNet project for the
  --program transforms fix.
- Allow hostfiles to specify usernames on a per-host basis.
- Update wrapper compiler scripts to search for perl during configure,
  per request from the BSD maintainers.
- Minor man page fixes.
- Added --with-libltdl option to allow building Open MPI with an
  external installation of libltdl.
- Fixed various issues with -D_FORTIFY_SOURCE=2.
- Various VT fixes and updates.


1.5: 10 Oct 2010
----------------

- Added "knem" support: direct process-to-process copying for shared
  memory message passing.  See http://runtime.bordeaux.inria.fr/knem/
  and the README file for more details.
- Updated shared library versioning scheme and linking style of MPI
  applications.  The MPI application ABI has been broken from the
  v1.3/v1.4 series.  MPI applications compiled against any prior
  version of Open MPI will need to, at a minimum, re-link.  See the
  README file for more details.
- Added "fca" collective component, enabling MPI collective offload
  support for Voltaire switches.
- Fixed MPI one-sided operations with large target displacements.
  Thanks to Brian Price and Jed Brown for reporting the issue.
- Fixed MPI_GET_COUNT when used with large counts.  Thanks to Jed
  Brown for reporting the issue.
- Made the openib BTL safer if extremely low SRQ settings are used.
- Fixed handling of the array_of_argv parameter in the Fortran
  binding of MPI_COMM_SPAWN_MULTIPLE (** also to appear: 1.4.3).
- Fixed malloc(0) warnings in some collectives.
- Fixed a problem with the Fortran binding for
  MPI_FILE_CREATE_ERRHANDLER.  Thanks to Secretan Yves for identifying
  the issue (** also to appear: 1.4.3).
- Updates to the LSF PLM to ensure that the path is correctly passed.
  Thanks to Teng Lin for the patch (** also to appear: 1.4.3).
- Fixes for the F90 MPI_COMM_SET_ERRHANDLER and MPI_WIN_SET_ERRHANDLER
  bindings.  Thanks to Paul Kapinos for pointing out the issue
  (** also to appear: 1.4.3).
- Fixed extra_state parameter types in F90 prototypes for
  MPI_COMM_CREATE_KEYVAL, MPI_GREQUEST_START, MPI_REGISTER_DATAREP,
  MPI_TYPE_CREATE_KEYVAL, and MPI_WIN_CREATE_KEYVAL.
- Fixes for Solaris oversubscription detection.
- If the PML determines it can't reach a peer process, print a
  slightly more helpful message.  Thanks to Nick Edmonds for the
  suggestion.
- Make btl_openib_if_include/exclude function the same way
  btl_tcp_if_include/exclude works (i.e., supplying an _include list
  overrides supplying an _exclude list).
- Apply more scalable reachability algorithm on platforms with more
  than 8 TCP interfaces.
- Various assembly code updates for more modern platforms / compilers.
- Relax restrictions on using certain kinds of MPI datatypes with
  one-sided operations.  Users beware; not all MPI datatypes are valid
  for use with one-sided operations!
- Improve behavior of MPI_COMM_SPAWN with regards to --bynode.
- Various threading fixes in the openib BTL and other core pieces of
  Open MPI.
- Various help file and man pages updates.
- Various FreeBSD and NetBSD updates and fixes.  Thanks to Kevin
  Buckley and Aleksej Saushev for their work.
- Fix case where freeing communicators in MPI_FINALIZE could cause
  process failures.
- Print warnings if shared memory state files are opened on what look
  like networked filesystems.
- Update libevent to v1.4.13.
- Allow propagating signals to processes that call fork().
- Fix bug where MPI_GATHER was sometimes incorrectly examining the
  datatype on non-root processes.  Thanks to Michael Hofmann for
  investigating the issue.
- Various Microsoft Windows fixes.
- Various Catamount fixes.
- Various checkpoint / restart fixes.
- Xgrid support has been removed until it can be fixed (patches
  would be welcome).
- Added simplistic "libompitrace" contrib package.  Using the MPI
  profiling interface, it essentially prints out to stderr when select
  MPI functions are invoked.
- Update bundled VampirTrace to v5.8.2.
- Add pkg-config(1) configuration files for ompi, ompi-c, ompi-cxx,
  ompi-f77, ompi-f90.  See the README for more details.
- Removed the libopenmpi_malloc library (added in the v1.3 series)
  since it is no longer necessary
- Add several notifier plugins (generally used when Open MPI detects
  system/network administrator-worthy problems); each have their own
  MCA parameters to govern their usage.  See "ompi_info --param
  notifier <name>" for more details.
  - command to execute arbitrary commands (e.g., run a script).
  - file to send output to a file.
  - ftb to send output to the Fault Tolerant Backplane (see
    http://wiki.mcs.anl.gov/cifts/index.php/CIFTS)
  - hnp to send the output to mpirun.
  - smtp (requires libesmtp) to send an email.

1.4.5: 12 Feb 2012
------------------

- Fixed the --disable-memory-manager configure switch.
  (** also to appear in 1.5.5)
- Fix typos in code and man pages.  Thanks to Fujitsu for these fixes.
  (** also to appear in 1.5.5)
- Improve management of the registration cache; when full, try freeing
  old entries and attempt to re-register.
- Fixed a data packing pointer alignment issue.  Thanks to Fujitsu
  for the patch.
  (** also to appear in 1.5.5)
- Add ability to turn off warning about having the shared memory backing
  store over a networked filesystem.  Thanks to Chris Samuel for this
  suggestion.
  (** also to appear in 1.5.5)
- Removed an unnecessary memmove() and plugged a couple of small memory leaks
  in the openib OOB connection setup code.
- Fixed some QLogic bugs. Thanks to Mark Debbage from QLogic for the patches.
- Fixed problem with MPI_IN_PLACE and other sentinel Fortran constants
  on OS X.
  (** also to appear in 1.5.5)
- Fix SLURM cpus-per-task allocation.
  (** also to appear in 1.5.5)
- Fix the datatype engine for when data left over from the previous
  pack was larger than the allowed space in the pack buffer. Thanks to
  Yuki Matsumoto and Takahiro Kawashima for the bug report and the
  patch.
- Fix Fortran value for MPI_MAX_PORT_NAME.  Thanks to Enzo Dari for
  raising the issue.
- Workaround an Intel compiler v12.1.0 2011.6.233 vector optimization
  bug.
- Fix issues on Solaris with the openib BTL.
- Fixes for the Oracle Studio 12.2 Fortran compiler.
- Update iWARP parameters for the Intel NICs.
  (** also to appear in 1.5.5)
- Fix obscure cases where MPI_ALLGATHER could crash.  Thanks to Andrew
  Senin for reporting the problem.
  (** also to appear in 1.5.5)


1.4.4: 11 Oct 2011
------------------

- Modified a memcpy() call in the openib btl connection setup to use
  memmove() instead because of the possibility of an overlapping
  copy (as identified by valgrind).
- Changed use of sys_timer_get_cycles() to the more appropriate
  wrapper: opal_timer_base_get_cycles().  Thanks to Jani Monoses
  for this fix.
- Corrected the reported default value of btl_openib_ib_timeout
  in the "IB retries exceeded" error message.  Thanks to Kevin Buckley
  for this correction.
- Increased rdmacm address resolution timeout from 1s to 30s &
  updated Chelsio T4 openib BTL defaults.  Thanks to Steve Wise
  for these updates.
  (** also to appear in 1.5.5)
- Ensure that MPI_Accumulate error return in 1.4 is consistent with
  1.5.x and trunk.
- Allow the word "slots" in rankfiles (i.e., not just "slot").
  (** also appeared in 1.5.4)
- Add Mellanox ConnectX 3 device IDs to the openib BTL defaults.
  (** also appeared in 1.5.4)
- Update description of btl_openib_cq_size to be more accurate.
- Ensure mpirun's --xterm options leaves sessions attached.
  (** also appeared in 1.5.4)
- Update to allow more than 128 entries in an appfile.
  (** also appeared in 1.5.4)
- Update description of btl_openib_cq_size to be more accurate.
  (** also appeared in 1.5.4)
- Fix for deadlock when handling recursive attribute keyval deletions
  (e.g., when using ROMIO with MPI_THREAD_MULTIPLE).
- Fix indexed datatype leaks.  Thanks to Pascal Deveze for supplying
  the initial patch.  (** also appeared in 1.5.4)
- Fixed the F90 types of the sendcounts and displs parameters to
  MPI_SCATTERV.  Thanks to Stanislav Sazykin for identifying the issue.
  (** also appeared in 1.5.4)
- Exclude opal/libltdl from "make distclean" when --disable-dlopen is
  used.  Thanks to David Gunter for reporting the issue.
- Fixed a segv in MPI_Comm_create when called with GROUP_EMPTY.
  Thanks to Dominik Goeddeke for finding this.
  (** also appeared in 1.5.4)
- Fixed return codes from MPI_PROBE and MPI_IPROBE.
  (** also appeared in 1.5.4)
- Fixed undefined symbol error when using the vtf90 profiling tool.
- Fix for referencing an uninitialized variable in DPM ORTE.  Thanks
  to Avinash Malik for reporting the issue.
- Fix for correctly handling multi-token args when using debuggers.
- Eliminated the unneeded u_int*_t datatype definitions.
- Change in ORTE DPM to get around gcc 4.[45].x compiler wanrings
  about possibly calling free() on a non-heap variable, even though it
  will never happen because the refcount will never go to zero.
- Fixed incorrect text in MPI_File_set_view man page.
- Fix in MPI_Init_thread for checkpoint/restart.
- Fix for libtool issue when using pgcc to compile ompi in conjunction
  with the -tp option.
- Fixed a race condition in osc_rdma_sync.  Thanks to Guillaume
  Thouvenin for finding this issue.
- Clarification of MPI_Init_thread man page.
- Fixed an indexing problem in precondition_transports.
- Fixed a problem in which duplicated libs were being specified for
  linking.  Thanks to Hicham Mouline for noticing it.
- Various autogen.sh fixes.
- Fix for memchecking buffers during MPI_*INIT.
- Man page cleanups.  Thanks to Jeremiah Willcock and Jed Brown.
- Fix for VT rpmbuild on RHEL5.
- Support Solaris legacy munmap prototype changes.
  (** also appeared in 1.5.4)
- Expands app_idx to int32_t to allow more than 127 app_contexts.
- Guard the inclusion of execinfo.h since not all platforms have it.  Thanks
  to Aleksej Saushev for identifying this issue.
  (** also appeared in 1.5.4)
- Fix to avoid possible environment corruption.  Thanks to Peter Thompson
  for identifying the issue and supplying a patch.
  (** also appeared in 1.5.4)
- Fixed paffinity base MCA duplicate registrations.  Thanks to Gus
  Correa for bringing this to our attention.
- Fix recursive locking bug when MPI-IO was used with
  MPI_THREAD_MULTIPLE.  (** also appeared in 1.5.4)
- F90 MPI API fixes.
- Fixed a misleading MPI_Bcast error message.  Thanks to Jeremiah
  Willcock for reporting this.
- Added <sys/stat.h> to ptmalloc's hooks.c (it's not always included
  by default on some systems).
- Libtool patch to get around a build problem when using the IBM XL
  compilers.
- Fix to detect and avoid overlapping memcpy().  Thanks to
  Francis Pellegrini for identifying the issue.
- Fix to allow ompi to work on top of RoCE vLANs.
- Restored a missing debugger flag to support TotalView.  Thanks to
  David Turner and the TV folks for supplying the fix.
- Updated SLURM support to 1.5.1.
- Removed an extraneous #include from the TCP BTL.
- When specifying OOB ports, fix to convert the ports into network
  byte order before binding.
- Fixed use of memory barriers in the SM BTL.  This fixed segv's when
  compiling with Intel 10.0.025 or PGI 9.0-3.
- Fix to prevent the SM BTL from creating its mmap'd file in
  directories that are remotely mounted.


1.4.3: 6 Sep 2010
-----------------

- Fixed handling of the array_of_argv parameter in the Fortran
  binding of MPI_COMM_SPAWN_MULTIPLE (** also to appear: 1.5).
- Fixed a problem with the Fortran binding for
  MPI_FILE_CREATE_ERRHANDLER.  Thanks to Secretan Yves for identifying
  the issue (** also to appear: 1.5).
- Updates to the LSF PLM to ensure that the path is correctly passed.
  Thanks to Teng Lin for the patch (** also to appear: 1.5).
- Fixes for the F90 MPI_COMM_SET_ERRHANDLER and MPI_WIN_SET_ERRHANDLER
  bindings.  Thanks to Paul Kapinos for pointing out the issue.
  (** also to appear: 1.5).
- Fixed various MPI_THREAD_MULTIPLE race conditions.
- Fixed an issue with an undeclared variable from ptmalloc2 munmap on
  BSD systems.
- Fixes for BSD interface detection.
- Various other BSD fixes.  Thanks to Kevin Buckley helping to track.
  all of this down.
- Fixed issues with the use of the -nper* mpirun command line arguments.
- Fixed an issue with coll tuned dynamic rules.
- Fixed an issue with the use of OPAL_DESTDIR being applied too aggressively.
- Fixed an issue with one-sided xfers when the displacement exceeds 2GBytes.
- Change to ensure TotalView works properly on Darwin.
- Added support for Visual Studio 2010.
- Fix to ensure proper placement of VampirTrace header files.
- Needed to add volatile keyword to a varialbe used in debugging
  (MPIR_being_debugged).
- Fixed a bug in inter-allgather.
- Fixed malloc(0) warnings.
- Corrected a typo the MPI_Comm_size man page (intra -> inter).  Thanks
  to Simon number.cruncher for pointing this out.
- Fixed a SegV in orted when given more than 127 app_contexts.
- Removed xgrid source code from the 1.4 branch since it is no longer
  supported in the 1.4 series.
- Removed the --enable-opal-progress-threads config option since
  opal progress thread support does not work in 1.4.x.
- Fixed a defect in VampirTrace's vtfilter.
- Fixed wrong Windows path in hnp_contact.
- Removed the requirement for a paffinity component.
- Removed a hardcoded limit of 64 interconnected jobs.
- Fix to allow singletons to use ompi-server for rendezvous.
- Fixed bug in output-filename option.
- Fix to correctly handle failures in mx_init().
- Fixed a potential Fortran memory leak.
- Fixed an incorrect branch in some ppc32 assembly code.  Thanks
  to Matthew Clark for this fix.
- Remove use of undocumented AS_VAR_GET macro during configuration.
- Fixed an issue with VampirTrace's wrapper for MPI_init_thread.
- Updated mca-btl-openib-device-params.ini file with various new vendor id's.
- Configuration fixes to ensure CPPFLAGS in handled properly if a non-standard
  valgrind location was specified.
- Various man page updates


1.4.2: 4 May 2010
-----------------

- Fixed problem when running in heterogeneous environments.  Thanks to
  Timur Magomedov for helping to track down this issue.
- Update LSF support to ensure that the path is passed correctly.
  Thanks to Teng Lin for submitting a patch.
- Fixed some miscellaneous oversubscription detection bugs.
- IBM re-licensed its LoadLeveler code to be BSD-compliant.
- Various OpenBSD and NetBSD build and run-time fixes.  Many thanks to
  the OpenBSD community for their time, expertise, and patience
  getting these fixes incorporated into Open MPI's main line.
- Various fixes for multithreading deadlocks, race conditions, and
  other nefarious things.
- Fixed ROMIO's handling of "nearly" contiguous issues (e.g., with
  non-zero true_lb).  Thanks for Pascal Deveze for the patch.
- Bunches of Windows build fixes.  Many thanks to several Windows
  users for their help in improving our support on Windows.
- Now allow the graceful failover from MTLs to BTLs if no MTLs can
  initialize successfully.
- Added "clobber" information to various atomic operations, fixing
  erroneous behavior in some newer versions of the GNU compiler suite.
- Update various iWARP and InfiniBand device specifications in the
  OpenFabrics .ini support file.
- Fix the use of hostfiles when a username is supplied.
- Various fixes for rankfile support.
- Updated the internal version of VampirTrace to 5.4.12.
- Fixed OS X TCP wireup issues having to do with IPv4/IPv6 confusion
  (see https://svn.open-mpi.org/trac/ompi/changeset/22788 for more
  details).
- Fixed some problems in processor affinity support, including when
  there are "holes" in the processor namespace (e.g., offline
  processors).
- Ensure that Open MPI's "session directory" (usually located in /tmp)
  is cleaned up after process termination.
- Fixed some problems with the collective "hierarch" implementation
  that could occur in some obscure conditions.
- Various MPI_REQUEST_NULL, API parameter checking, and attribute
  error handling fixes.  Thanks to Lisandro Dalcín for reporting the
  issues.
- Fix case where MPI_GATHER erroneously used datatypes on non-root
  nodes.  Thanks to Michael Hofmann for investigating the issue.
- Patched ROMIO support for PVFS2 > v2.7 (patch taken from MPICH2
  version of ROMIO).
- Fixed "mpirun --report-bindings" behavior when used with
  mpi_paffinity_alone=1.  Also fixed mpi_paffinity_alone=1 behavior
  with non-MPI applications.  Thanks to Brice Goglin for noticing the
  problem.
- Ensure that all OpenFabrics devices have compatible receive_queues
  specifications before allowing them to communicate.  See the lengthy
  comment in https://svn.open-mpi.org/trac/ompi/changeset/22592 for
  more details.
- Fix some issues with checkpoint/restart.
- Improve the pre-MPI_INIT/post-MPI_FINALIZE error messages.
- Ensure that loopback addresses are never advertised to peer
  processes for RDMA/OpenFabrics support.
- Fixed a CSUM PML false positive.
- Various fixes for Catamount support.
- Minor update to wrapper compilers in how user-specific argv is
  ordered on the final command line.  Thanks to Jed Brown for the
  suggestions.
- Removed flex.exe binary from Open MPI tarballs; now generate flex
  code from a newer (Windows-friendly) flex when we make official
  tarballs.


1.4.1: 15 Jan 2010
------------------

- Update to PLPA v1.3.2, addressing a licensing issue identified by
  the Fedora project.  See
  https://svn.open-mpi.org/trac/plpa/changeset/262 for details.
- Add check for malformed checkpoint metadata files (Ticket #2141).
- Fix error path in ompi-checkpoint when not able to checkpoint
  (Ticket #2138).
- Cleanup component release logic when selecting checkpoint/restart
  enabled components (Ticket #2135).
- Fixed VT node name detection for Cray XT platforms, and fixed some
  broken VT documentation files.
- Fix a possible race condition in tearing down RDMA CM-based
  connections.
- Relax error checking on MPI_GRAPH_CREATE.  Thanks to David Singleton
  for pointing out the issue.
- Fix a shared memory "hang" problem that occurred on x86/x86_64
  platforms when used with the GNU >=4.4.x compiler series.
- Add fix for Libtool 2.2.6b's problems with the PGI 10.x compiler
  suite.  Inspired directly from the upstream Libtool patches that fix
  the issue (but we need something working before the next Libtool
  release).


1.4: 8 Dec 2009
---------------

The *only* change in the Open MPI v1.4 release (as compared to v1.3.4)
was to update the embedded version of Libtool's libltdl to address a
potential security vulnerability.  Specifically: Open MPI v1.3.4 was
created with GNU Libtool 2.2.6a; Open MPI v1.4 was created with GNU
Libtool 2.2.6b.  There are no other changes between Open MPI v1.3.4
and v1.4.


1.3.4: 13 Feb 2010
------------------

- Fix some issues in OMPI's SRPM with regard to shell_scripts_basename
  and its use with mpi-selector.  Thanks to Bill Johnstone for
  pointing out the problem.
- Added many new MPI job process affinity options to mpirun.  See the
  newly-updated mpirun(1) man page for details.
- Several updates to mpirun's XML output.
- Update to fix a few Valgrind warnings with regards to the ptmalloc2
  allocator and Open MPI's use of PLPA.
- Many updates and fixes to the (non-default) "sm" collective
  component (i.e., native shared memory MPI collective operations).
- Updates and fixes to some MPI_COMM_SPAWN_MULTIPLE corner cases.
- Fix some internal copying functions in Open MPI's use of PLPA.
- Correct some SLURM nodelist parsing logic that may have interfered
  with large jobs.  Additionally, per advice from the SLURM team,
  change the environment variable that we use for obtaining the job's
  allocation.
- Revert to an older, safer (but slower) communicator ID allocation
  algorithm.
- Fixed minimum distance finding for OpenFabrics devices in the openib
  BTL.
- Relax the parameter checking MPI_CART_CREATE a bit.
- Fix MPI_COMM_SPAWN[_MULTIPLE] to only error-check the info arguments
  on the root process.  Thanks to Federico Golfre Andreasi for
  reporting the problem.
- Fixed some BLCR configure issues.
- Fixed a potential deadlock when the openib BTL was used with
  MPI_THREAD_MULTIPLE.
- Fixed dynamic rules selection for the "tuned" coll component.
- Added a launch progress meter to mpirun (useful for large jobs; set
  the orte_report_launch_progress MCA parameter to 1 to see it).
- Reduced the number of file descriptors consumed by each MPI process.
- Add new device IDs for Chelsio T3 RNICs to the openib BTL config file.
- Fix some CRS self component issues.
- Added some MCA parameters to the PSM MTL to tune its run-time
  behavior.
- Fix some VT issues with MPI_BOTTOM/MPI_IN_PLACE.
- Man page updates from the Debain Open MPI package maintainers.
- Add cycle counter support for the Alpha and Sparc platforms.
- Pass visibility flags to libltdl's configure script, resulting in
  those symbols being hidden.  This appears to mainly solve the
  problem of applications attempting to use different versions of
  libltdl from that used to build Open MPI.


1.3.3: 14 Jul 2009
------------------

- Fix a number of issues with the openib BTL (OpenFabrics) RDMA CM,
  including a memory corruption bug, a shutdown deadlock, and a route
  timeout.  Thanks to David McMillen and Hal Rosenstock for help in
  tracking down the issues.
- Change the behavior of the EXTRA_STATE parameter that is passed to
  Fortran attribute callback functions: this value is now stored
  internally in MPI -- it no longer references the original value
  passed by MPI_*_CREATE_KEYVAL.
- Allow the overriding RFC1918 and RFC3330 for the specification of
  "private" networks, thereby influencing Open MPI's TCP
  "reachability" computations.
- Improve flow control issues in the sm btl, by both tweaking the
  shared memory progression rules and by enabling the "sync" collective
  to barrier every 1,000th collective.
- Various fixes for the IBM XL C/C++ v10.1 compiler.
- Allow explicit disabling of ptmalloc2 hooks at runtime (e.g., enable
  support for Debian's builtroot system).  Thanks to Manuel Prinz and
  the rest of the Debian crew for helping identify and fix this issue.
- Various minor fixes for the I/O forwarding subsystem.
- Big endian iWARP fixes in the Open Fabrics RDMA CM support.
- Update support for various OpenFabrics devices in the openib BTL's
  .ini file.
- Fixed undefined symbol issue with Open MPI's parallel debugger
  message queue support so it can be compiled by Sun Studio compilers.
- Update MPI_SUBVERSION to 1 in the Fortran bindings.
- Fix MPI_GRAPH_CREATE Fortran 90 binding.
- Fix MPI_GROUP_COMPARE behavior with regards to MPI_IDENT.  Thanks to
  Geoffrey Irving for identifying the problem and supplying the fix.
- Silence gcc 4.1 compiler warnings about type punning.  Thanks to
  Number Cruncher for the fix.
- Added more Valgrind and other memory-cleanup fixes.  Thanks to
  various Open MPI users for help with these issues.
- Miscellaneous VampirTrace fixes.
- More fixes for openib credits in heavy-congestion scenarios.
- Slightly decrease the latency in the openib BTL in some conditions
  (add "send immediate" support to the openib BTL).
- Ensure to allow MPI_REQUEST_GET_STATUS to accept an
  MPI_STATUS_IGNORE parameter.  Thanks to Shaun Jackman for the bug
  report.
- Added Microsoft Windows support.  See README.WINDOWS file for
  details.


1.3.2: 22 Apr 2009
------------------

- Fixed a potential infinite loop in the openib BTL that could occur
  in senders in some frequent-communication scenarios.  Thanks to Don
  Wood for reporting the problem.
- Add a new checksum PML variation on ob1 (main MPI point-to-point
  communication engine) to detect memory corruption in node-to-node
  messages
- Add a new configuration option to add padding to the openib
  header so the data is aligned
- Add a new configuration option to use an alternative checksum algo
  when using the checksum PML
- Fixed a problem reported by multiple users on the mailing list that
  the LSF support would fail to find the appropriate libraries at
  run-time.
- Allow empty shell designations from getpwuid().  Thanks to Sergey
  Koposov for the bug report.
- Ensure that mpirun exits with non-zero status when applications die
  due to user signal.  Thanks to Geoffroy Pignot for suggesting the
  fix.
- Ensure that MPI_VERSION / MPI_SUBVERSION match what is returned by
  MPI_GET_VERSION.  Thanks to Rob Egan for reporting the error.
- Updated MPI_*KEYVAL_CREATE functions to properly handle Fortran
  extra state.
- A variety of ob1 (main MPI point-to-point communication engine) bug
  fixes that could have caused hangs or seg faults.
- Do not install Open MPI's signal handlers in MPI_INIT if there are
  already signal handlers installed.  Thanks to Kees Verstoep for
  bringing the issue to our attention.
- Fix GM support to not seg fault in MPI_INIT.
- Various VampirTrace fixes.
- Various PLPA fixes.
- No longer create BTLs for invalid (TCP) devices.
- Various man page style and lint cleanups.
- Fix critical OpenFabrics-related bug noted here:
  http://www.open-mpi.org/community/lists/announce/2009/03/0029.php.
  Open MPI now uses a much more robust memory intercept scheme that is
  quite similar to what is used by MX.  The use of "-lopenmpi-malloc"
  is no longer necessary, is deprecated, and is expected to disappear
  in a future release.  -lopenmpi-malloc will continue to work for the
  duration of the Open MPI v1.3 and v1.4 series.
- Fix some OpenFabrics shutdown errors, both regarding iWARP and SRQ.
- Allow the udapl BTL to work on Solaris platforms that support
  relaxed PCI ordering.
- Fix problem where the mpirun would sometimes use rsh/ssh to launch on
  the localhost (instead of simply forking).
- Minor SLURM stdin fixes.
- Fix to run properly under SGE jobs.
- Scalability and latency improvements for shared memory jobs: convert
  to using one message queue instead of N queues.
- Automatically size the shared-memory area (mmap file) to match
  better what is needed;  specifically, so that large-np jobs will start.
- Use fixed-length MPI predefined handles in order to provide ABI
  compatibility between Open MPI releases.
- Fix building of the posix paffinity component to properly get the
  number of processors in loosely tested environments (e.g.,
  FreeBSD).  Thanks to Steve Kargl for reporting the issue.
- Fix --with-libnuma handling in configure.  Thanks to Gus Correa for
  reporting the problem.


1.3.1: 19 Mar 2009
------------------

- Added "sync" coll component to allow users to synchronize every N
  collective operations on a given communicator.
- Increased the default values of the IB and RNR timeout MCA parameters.
- Fix a compiler error noted by Mostyn Lewis with the PGI 8.0 compiler.
- Fix an error that prevented stdin from being forwarded if the
  rsh launcher was in use.  Thanks to Branden Moore for pointing out
  the problem.
- Correct a case where the added datatype is considered as contiguous but
  has gaps in the beginning.
- Fix an error that limited the number of comm_spawns that could
  simultaneously be running in some environments
- Correct a corner case in OB1's GET protocol for long messages; the
  error could sometimes cause MPI jobs using the openib BTL to hang.
- Fix a bunch of bugs in the IO forwarding (IOF) subsystem and add some
  new options to output to files and redirect output to xterm.  Thanks to
  Jody Weissmann for helping test out many of the new fixes and
  features.
- Fix SLURM race condition.
- Fix MPI_File_c2f(MPI_FILE_NULL) to return 0, not -1.  Thanks to
  Lisandro Dalcín for the bug report.
- Fix the DSO build of tm PLM.
- Various fixes for size disparity between C int's and Fortran
  INTEGER's.  Thanks to Christoph van Wullen for the bug report.
- Ensure that mpirun exits with a non-zero exit status when daemons or
  processes abort or fail to launch.
- Various fixes to work around Intel (NetEffect) RNIC behavior.
- Various fixes for mpirun's --preload-files and --preload-binary
  options.
- Fix the string name in MPI::ERRORS_THROW_EXCEPTIONS.
- Add ability to forward SIFTSTP and SIGCONT to MPI processes if you
  set the MCA parameter orte_forward_job_control to 1.
- Allow the sm BTL to allocate larger amounts of shared memory if
  desired (helpful for very large multi-core boxen).
- Fix a few places where we used PATH_MAX instead of OPAL_PATH_MAX,
  leading to compile problems on some platforms.  Thanks to Andrea Iob
  for the bug report.
- Fix mca_btl_openib_warn_no_device_params_found MCA parameter; it
  was accidentally being ignored.
- Fix some run-time issues with the sctp BTL.
- Ensure that RTLD_NEXT exists before trying to use it (e.g., it
  doesn't exist on Cygwin).  Thanks to Gustavo Seabra for reporting
  the issue.
- Various fixes to VampirTrace, including fixing compile errors on
  some platforms.
- Fixed missing MPI_Comm_accept.3 man page; fixed minor issue in
  orterun.1 man page.  Thanks to Dirk Eddelbuettel for identifying the
  problem and submitting a patch.
- Implement the XML formatted output of stdout/stderr/stddiag.
- Fixed mpirun's -wdir switch to ensure that working directories for
  multiple app contexts are properly handled.  Thanks to Geoffroy
  Pignot for reporting the problem.
- Improvements to the MPI C++ integer constants:
  - Allow MPI::SEEK_* constants to be used as constants
  - Allow other MPI C++ constants to be used as array sizes
- Fix minor problem with orte-restart's command line options.  See
  ticket #1761 for details.  Thanks to Gregor Dschung for reporting
  the problem.


1.3: 19 Jan 2009
----------------

- Extended the OS X 10.5.x (Leopard) workaround for a problem when
  assembly code is compiled with -g[0-9].  Thanks to Barry Smith for
  reporting the problem.  See ticket #1701.
- Disabled MPI_REAL16 and MPI_COMPLEX32 support on platforms where the
  bit representation of REAL*16 is different than that of the C type
  of the same size (usually long double).  Thanks to Julien Devriendt
  for reporting the issue.  See ticket #1603.
- Increased the size of MPI_MAX_PORT_NAME to 1024 from 36. See ticket #1533.
- Added "notify debugger on abort" feature. See tickets #1509 and #1510.
  Thanks to Seppo Sahrakropi for the bug report.
- Upgraded Open MPI tarballs to use Autoconf 2.63, Automake 1.10.1,
  Libtool 2.2.6a.
- Added missing MPI::Comm::Call_errhandler() function.  Thanks to Dave
  Goodell for bringing this to our attention.
- Increased MPI_SUBVERSION value in mpi.h to 1 (i.e., MPI 2.1).
- Changed behavior of MPI_GRAPH_CREATE, MPI_TOPO_CREATE, and several
  other topology functions per MPI-2.1.
- Fix the type of the C++ constant MPI::IN_PLACE.
- Various enhancements to the openib BTL:
  - Added btl_openib_if_[in|ex]clude MCA parameters for
    including/excluding comma-delimited lists of HCAs and ports.
  - Added RDMA CM support, includng btl_openib_cpc_[in|ex]clude MCA
    parameters
  - Added NUMA support to only use "near" network adapters
  - Added "Bucket SRQ" (BSRQ) support to better utilize registered
    memory, including btl_openib_receive_queues MCA parameter
  - Added ConnectX XRC support (and integrated with BSRQ)
  - Added btl_openib_ib_max_inline_data MCA parameter
  - Added iWARP support
  - Revamped flow control mechansisms to be more efficient
  - "mpi_leave_pinned=1" is now the default when possible,
    automatically improving performance for large messages when
    application buffers are re-used
- Elimiated duplicated error messages when multiple MPI processes fail
  with the same error.
- Added NUMA support to the shared memory BTL.
- Add Valgrind-based memory checking for MPI-semantic checks.
- Add support for some optional Fortran datatypes (MPI_LOGICAL1,
  MPI_LOGICAL2, MPI_LOGICAL4 and MPI_LOGICAL8).
- Remove the use of the STL from the C++ bindings.
- Added support for Platform/LSF job launchers.  Must be Platform LSF
  v7.0.2 or later.
- Updated ROMIO with the version from MPICH2 1.0.7.
- Added RDMA capable one-sided component (called rdma), which
  can be used with BTL components that expose a full one-sided
  interface.
- Added the optional datatype MPI_REAL2. As this is added to the "end of"
  predefined datatypes in the fortran header files, there will not be
  any compatibility issues.
- Added Portable Linux Processor Affinity (PLPA) for Linux.
- Addition of a finer symbols export control via the visibiliy feature
  offered by some compilers.
- Added checkpoint/restart process fault tolerance support. Initially
  support a LAM/MPI-like protocol.
- Removed "mvapi" BTL; all InfiniBand support now uses the OpenFabrics
  driver stacks ("openib" BTL).
- Added more stringent MPI API parameter checking to help user-level
  debugging.
- The ptmalloc2 memory manager component is now by default built as
  a standalone library named libopenmpi-malloc.  Users wanting to
  use leave_pinned with ptmalloc2 will now need to link the library
  into their application explicitly.  All other users will use the
  libc-provided allocator instead of Open MPI's ptmalloc2.  This change
  may be overriden with the configure option enable-ptmalloc2-internal
- The leave_pinned options will now default to using mallopt on
  Linux in the cases where ptmalloc2 was not linked in.  mallopt
  will also only be available if munmap can be intercepted (the
  default whenever Open MPI is not compiled with --without-memory-
  manager.
- Open MPI will now complain and refuse to use leave_pinned if
  no memory intercept / mallopt option is available.
- Add option of using Perl-based wrapper compilers instead of the
  C-based wrapper compilers.  The Perl-based version does not
  have the features of the C-based version, but does work better
  in cross-compile environments.


1.2.9: 14 Feb 2009
------------------

- Fix a segfault when using one-sided communications on some forms of derived
  datatypes.  Thanks to Dorian Krause for reporting the bug. See #1715.
- Fix an alignment problem affecting one-sided communications on
  some architectures (e.g., SPARC64). See #1738.
- Fix compilation on Solaris when thread support is enabled in Open MPI
  (e.g., when using --with-threads). See #1736.
- Correctly take into account the MTU that an OpenFabrics device port
  is using. See #1722 and
  https://bugs.openfabrics.org/show_bug.cgi?id=1369.
- Fix two datatype engine bugs. See #1677.
  Thanks to Peter Kjellstrom for the bugreport.
- Fix the bml r2 help filename so the help message can be found. See #1623.
- Fix a compilation problem on RHEL4U3 with the PGI 32 bit compiler
  caused by <infiniband/driver.h>.  See ticket #1613.
- Fix the --enable-cxx-exceptions configure option. See ticket #1607.
- Properly handle when the MX BTL cannot open an endpoint. See ticket #1621.
- Fix a double free of events on the tcp_events list. See ticket #1631.
- Fix a buffer overun in opal_free_list_grow (called by MPI_Init).
  Thanks to Patrick Farrell for the bugreport and Stephan Kramer for
  the bugfix.  See ticket #1583.
- Fix a problem setting OPAL_PREFIX for remote sh-based shells.
  See ticket #1580.


1.2.8: 14 Oct 2008
------------------

- Tweaked one memory barrier in the openib component to be more conservative.
  May fix a problem observed on PPC machines.  See ticket #1532.
- Fix OpenFabrics IB partition support. See ticket #1557.
- Restore v1.1 feature that sourced .profile on remote nodes if the default
  shell will not do so (e.g. /bin/sh and /bin/ksh).  See ticket #1560.
- Fix segfault in MPI_Init_thread() if ompi_mpi_init() fails. See ticket #1562.
- Adjust SLURM support to first look for $SLURM_JOB_CPUS_PER_NODE instead of
  the deprecated $SLURM_TASKS_PER_NODE environment variable.  This change
  may be *required* when using SLURM v1.2 and above.  See ticket #1536.
- Fix the MPIR_Proctable to be in process rank order. See ticket #1529.
- Fix a regression introduced in 1.2.6 for the IBM eHCA. See ticket #1526.


1.2.7: 28 Aug 2008
------------------

- Add some Sun HCA vendor IDs.  See ticket #1461.
- Fixed a memory leak in MPI_Alltoallw when called from Fortran.
  Thanks to Dave Grote for the bugreport.  See ticket #1457.
- Only link in libutil when it is needed/desired.  Thanks to
  Brian Barret for diagnosing and fixing the problem.  See ticket #1455.
- Update some QLogic HCA vendor IDs.  See ticket #1453.
- Fix F90 binding for MPI_CART_GET.  Thanks to Scott Beardsley for
  bringing it to our attention. See ticket #1429.
- Remove a spurious warning message generated in/by ROMIO. See ticket #1421.
- Fix a bug where command-line MCA parameters were not overriding
  MCA parameters set from environment variables.  See ticket #1380.
- Fix a bug in the AMD64 atomics assembly.  Thanks to Gabriele Fatigati
  for the bug report and bugfix.  See ticket #1351.
- Fix a gather and scatter bug on intercommunicators when the datatype
  being moved is 0 bytes. See ticket #1331.
- Some more man page fixes from the Debian maintainers.
  See tickets #1324 and #1329.
- Have openib BTL (OpenFabrics support) check for the presence of
  /sys/class/infiniband before allowing itself to be used.  This check
  prevents spurious "OMPI did not find RDMA hardware!" notices on
  systems that have the software drivers installed, but no
  corresponding hardware.  See tickets #1321 and #1305.
- Added vendor IDs for some ConnectX openib HCAs. See ticket #1311.
- Fix some RPM specfile inconsistencies.  See ticket #1308.
  Thanks to Jim Kusznir for noticing the problem.
- Removed an unused function prototype that caused warnings on
  some systems (e.g., OS X).  See ticket #1274.
- Fix a deadlock in inter-communicator scatter/gather operations.
  Thanks to Martin Audet for the bug report.  See ticket #1268.


1.2.6: 7 Apr 2008
-----------------

- Fix a bug in the inter-allgather for asymmetric inter-communicators.
  Thanks to Martin Audet for the bug report. See ticket #1247.
- Fix a bug in the openib BTL when setting the CQ depth.  Thanks
  to Jon Mason for the bug report and fix.  See ticket #1245.
- On Mac OS X Leopard, the execinfo component will be used for
  backtraces, making for a more durable solution.  See ticket #1246.
- Added vendor IDs for some QLogic DDR openib HCAs. See ticket #1227.
- Updated the URL to get the latest config.guess and config.sub files.
  Thanks to Ralf Wildenhues for the bug report. See ticket #1226.
- Added shared contexts support to PSM MTL.  See ticket #1225.
- Added pml_ob1_use_early_completion MCA parameter to allow users
  to turn off the OB1 early completion semantic and avoid "stall"
  problems seen on InfiniBand in some cases.  See ticket #1224.
- Sanitized some #define macros used in mpi.h to avoid compiler warnings
  caused by MPI programs built with different autoconf versions.
  Thanks to Ben Allan for reporting the problem, and thanks to
  Brian Barrett for the fix. See ticket #1220.
- Some man page fixes from the Debian maintainers. See ticket #1219.
- Made the openib BTL a bit more resilient in the face of driver
  errors.  See ticket #1217.
- Fixed F90 interface for MPI_CART_CREATE.  See ticket #1208.
  Thanks to Michal Charemza for reporting the problem.
- Fixed some C++ compiler warnings. See ticket #1203.
- Fixed formatting of the orterun man page.  See ticket #1202.
  Thanks to Peter Breitenlohner for the patch.


1.2.5: 8 Jan 2008
-----------------

- Fixed compile issue with open() on Fedora 8 (and newer) platforms.
  Thanks to Sebastian Schmitzdorff for noticing the problem.
- Added run-time warnings during MPI_INIT when MPI_THREAD_MULTIPLE
  and/or progression threads are used (the OMPI v1.2 series does not
  support these well at all).
- Better handling of ECONNABORTED from connect on Linux.  Thanks to
  Bob Soliday for noticing the problem; thanks to Brian Barrett for
  submitting a patch.
- Reduce extraneous output from OOB when TCP connections must
  be retried.  Thanks to Brian Barrett for submitting a patch.
- Fix for ConnectX devices and OFED 1.3.  See ticket #1190.
- Fixed a configure problem for Fortran 90 on Cray systems.  Ticket #1189.
- Fix an uninitialized variable in the error case in opal_init.c.
  Thanks to Åke Sandgren for pointing out the mistake.
- Fixed a hang in configure if $USER was not defined.  Thanks to
  Darrell Kresge for noticing the problem.  See ticket #900.
- Added support for parallel debuggers even when we have an optimized build.
  See ticket #1178.
- Worked around a bus error in the Mac OS X 10.5.X (Leopard) linker when
  compiling Open MPI with -g.  See ticket #1179.
- Removed some warnings about 'rm' from Mac OS X 10.5 (Leopard) builds.
- Fix the handling of mx_finalize().  See ticket #1177.
  Thanks to Åke Sandgren for bringing this issue to our attention.
- Fixed minor file descriptor leak in the Altix timer code.  Thanks to
  Paul Hargrove for noticing the problem and supplying the fix.
- Fix a problem when using a different compiler for C and Objective C.
  See ticket #1153.
- Fix segfault in MPI_COMM_SPAWN when the user specified a working
  directory.  Thanks to Murat Knecht for reporting this and suggesting
  a fix.
- A few manpage fixes from the Debian Open MPI maintainers.  Thanks to
  Tilman Koschnick, Sylvestre Ledru, and Dirk Eddelbuettel.
- Fixed issue with pthread detection when compilers are not all
  from the same vendor.  Thanks to Åke Sandgren for the bug
  report.  See ticket #1150.
- Fixed vector collectives in the self module.  See ticket #1166.
- Fixed some data-type engine bugs: an indexing bug, and an alignment bug.
  See ticket #1165.
- Only set the MPI_APPNUM attribute if it is defined.  See ticket
  #1164.


1.2.4: 26 Sep 2007
------------------

- Really added support for TotalView/DDT parallel debugger message queue
  debugging (it was mistakenly listed as "added" in the 1.2 release).
- Fixed a build issue with GNU/kFreeBSD. Thanks to Petr Salinger for
  the patch.
- Added missing MPI_FILE_NULL constant in Fortran.  Thanks to
  Bernd Schubert for bringing this to our attention.
- Change such that the UDAPL BTL is now only built in Linux when
  explicitly specified via the --with-udapl configure command line
  switch.
- Fixed an issue with umask not being propagated when using the TM
  launcher.
- Fixed behavior if number of slots is not the same on all bproc nodes.
- Fixed a hang on systems without GPR support (ex. Cray XT3/4).
- Prevent users of 32-bit MPI apps from requesting >= 2GB of shared
  memory.
- Added a Portals MTL.
- Fix 0 sized MPI_ALLOC_MEM requests.  Thanks to Lisandro Dalcín for
  pointing out the problem.
- Fixed a segfault crash on large SMPs when doing collectives.
- A variety of fixes for Cray XT3/4 class of machines.
- Fixed which error handler is used when MPI_COMM_SELF is passed
  to MPI_COMM_FREE.  Thanks to Lisandro Dalcín for the bug report.
- Fixed compilation on platforms that don't have hton/ntoh.
- Fixed a logic problem in the fortran binding for MPI_TYPE_MATCH_SIZE.
  Thanks to Jeff Dusenberry for pointing out the problem and supplying
  the fix.
- Fixed a problem with MPI_BOTTOM in various places of the f77-interface.
  Thanks to Daniel Spangberg for bringing this up.
- Fixed problem where MPI-optional Fortran datatypes were not
  correctly initialized.
- Fixed several problems with stdin/stdout forwarding.
- Fixed overflow problems with the sm mpool MCA parameters on large SMPs.
- Added support for the DDT parallel debugger via orterun's --debug
  command line option.
- Added some sanity/error checks to the openib MCA parameter parsing
  code.
- Updated the udapl BTL to use RDMA capabilities.
- Allow use of the BProc head node if it was allocated to the user.
  Thanks to Sean Kelly for reporting the problem and helping debug it.
- Fixed a ROMIO problem where non-blocking I/O errors were not properly
  reported to the user.
- Made remote process launch check the $SHELL environment variable if
  a valid shell was not otherwise found for the user.
  Thanks to Alf Wachsmann for the bugreport and suggested fix.
- Added/updated some vendor IDs for a few openib HCAs.
- Fixed a couple of failures that could occur when specifying devices
  for use by the OOB.
- Removed dependency on sysfsutils from the openib BTL for
  libibverbs >=v1.1 (i.e., OFED 1.2 and beyond).


1.2.3: 20 Jun 2007
------------------

- Fix a regression in comm_spawn functionality that inadvertently
  caused the mapping of child processes to always start at the same
  place.  Thanks to Prakash Velayutham for helping discover the
  problem.
- Fix segfault when a user's home directory is unavailable on a remote
  node.  Thanks to Guillaume Thomas-Collignon for bringing the issue
  to our attention.
- Fix MPI_IPROBE to properly handle MPI_STATUS_IGNORE on mx and psm
  MTLs. Thanks to Sophia Corwell for finding this and supplying a
  reproducer.
- Fix some error messages in the tcp BTL.
- Use _NSGetEnviron instead of environ on Mac OS X so that there
  are no undefined symbols in the shared libraries.
- On OS X, when MACOSX_DEPLOYMENT_TARGET is 10.3 or higher, support
  building the Fortran 90 bindings as a shared library.  Thanks to
  Jack Howarth for his advice on making this work.
- No longer require extra include flag for the C++ bindings.
- Fix detection of weak symbols support with Intel compilers.
- Fix issue found by Josh England: ompi_info would not show framework
  MCA parameters set in the environment properly.
- Rename the oob_tcp_include/exclude MCA params to oob_tcp_if_include/exclude
  so that they match the naming convention of the btl_tcp_if_include/exclude
  params.  The old names are depreciated, but will still work.
- Add -wd as a synonym for the -wdir orterun/mpirun option.
- Fix the mvapi BTL to compile properly with compilers that do not support
  anonymous unions.  Thanks to Luis Kornblueh for reporting the bug.


1.2.2: 16 May 2007
------------------

- Fix regression in 1.2.1 regarding the handling of $CC with both
  absolute and relative path names.
- Fix F90 array of status dimensions.  Thanks to Randy Bramley for
  noticing the problem.
- Add btl_openib_ib_pkey_value MCA parameter for controlling IB port selection.
- Fixed a variety of threading/locking bugs.
- Fixed some compiler warnings associated with ROMIO, OS X, and gridengine.
- If pbs-config can be found, use it to look for TM support.  Thanks
  to Bas van der Vlies for the inspiration and preliminary work.
- Fixed a deadlock in orterun when the rsh PLS encounters some errors.


1.2.1: 25 Apr 2007
------------------

- Fixed a number of connection establishment errors in the TCP out-
  of-band messaging system.
- Fixed a memory leak when using mpi_comm calls.
  Thanks to Bas van der Vlies for reporting the problem.
- Fixed various memory leaks in OPAL and ORTE.
- Improved launch times when using TM (PBS Pro, Torque, Open PBS).
- Fixed mpi_leave_pinned to work for all datatypes.
- Fix functionality allowing users to disable sbrk() (the
  mpool_base_disable_sbrk MCA parameter) on platforms that support it.
- Fixed a pair of problems with the TCP "listen_thread" mode for the
  oob_tcp_listen_mode MCA parameter that would cause failures when
  attempting to launch applications.
- Fixed a segfault if there was a failure opening a BTL MX endpoint.
- Fixed a problem with mpirun's --nolocal option introduced in 1.2.
- Re-enabled MPI_COMM_SPAWN_MULTIPLE from singletons.
- LoadLeveler and TM configure fixes, Thanks to Martin Audet for the
  bug report.
- Various C++ MPI attributes fixes.
- Fixed issues with backtrace code on 64 bit Intel & PPC OS X builds.
- Fixed issues with multi-word CC variables and libtool.
  Thanks to Bert Wesarg for the bug reports.
- Fix issue with non-uniform node naming schemes in SLURM.
- Fix file descriptor leak in the Grid Engine/N1GE support.
- Fix compile error on OS X 10.3.x introduced with Open MPI 1.1.5.
- Implement MPI_TYPE_CREATE_DARRAY function (was in 1.1.5 but not 1.2).
- Recognize zsh shell when using rsh/ssh for launching MPI jobs.
- Ability to set the OPAL_DESTDIR or OPAL_PREFIX environment
  variables to "re-root" an existing Open MPI installation.
- Always include -I for Fortran compiles, even if the prefix is
  /usr/local.
- Support for "fork()" in MPI applications that use the
  OpenFabrics stack (OFED v1.2 or later).
- Support for setting specific limits on registered memory.


1.2: 15 Mar 2007
----------------

- Fixed race condition in the shared memory fifo's, which led to
  orphaned messages.
- Corrected the size of the shared memory file - subtracted out the
  space the header was occupying.
- Add support for MPI_2COMPLEX and MPI_2DOUBLE_COMPLEX.
- Always ensure to create $(includedir)/openmpi, even if the C++
  bindings are disabled so that the wrapper compilers don't point to
  a directory that doesn't exist.  Thanks to Martin Audet for
  identifying the problem.
- Fixes for endian handling in MPI process startup.
- Openib BTL initialization fixes for cases where MPI processes in the
  same job has different numbers of active ports on the same physical
  fabric.
- Print more descriptive information when displaying backtraces on
  OS's that support this functionality, such as the hostname and PID
  of the process in question.
- Fixes to properly handle MPI exceptions in C++ on communicators,
  windows, and files.
- Much more reliable runtime support, particularly with regards to MPI
  job startup scalability, BProc support, and cleanup in failure
  scenarios (e.g., MPI_ABORT, MPI processes abnormally terminating,
  etc.).
- Significant performance improvements for MPI collectives,
  particularly on high-speed networks.
- Various fixes in the MX BTL component.
- Fix C++ typecast problems with MPI_ERRCODES_IGNORE.  Thanks to
  Satish Balay for bringing this to our attention.
- Allow run-time specification of the maximum amount of registered
  memory for OpenFabrics and GM.
- Users who utilize the wrapper compilers (e.g., mpicc and mpif77)
  will not notice, but the underlying library names for ORTE and OPAL
  have changed to libopen-rte and libopen-pal, respectively (listed
  here because there are undoubtedly some users who are not using the
  wrapper compilers).
- Many bug fixes to MPI-2 one-sided support.
- Added support for TotalView message queue debugging.
- Fixes for MPI_STATUS_SET_ELEMENTS.
- Print better error messages when mpirun's "-nolocal" is used when
  there is only one node available.
- Added man pages for several Open MPI executables and the MPI API
  functions.
- A number of fixes for Alpha platforms.
- A variety of Fortran API fixes.
- Build the Fortran MPI API as a separate library to allow these
  functions to be profiled properly.
- Add new --enable-mpirun-prefix-by-default configure option to always
  imply the --prefix option to mpirun, preventing many rsh/ssh-based
  users from needing to modify their shell startup files.
- Add a number of missing constants in the C++ bindings.
- Added tight integration with Sun N1 Grid Engine (N1GE) 6 and the
  open source Grid Engine.
- Allow building the F90 MPI bindings as shared libraries for most
  compilers / platforms.  Explicitly disallow building the F90
  bindings as shared libraries on OS X because of complicated
  situations with Fortran common blocks and lack of support for
  unresolved common symbols in shared libraries.
- Added stacktrace support for Solaris and Mac OS X.
- Update event library to libevent-1.1b.
- Fixed standards conformance issues with MPI_ERR_TRUNCATED and
  setting MPI_ERROR during MPI_TEST/MPI_WAIT.
- Addition of "cm" PML to better support library-level matching
  interconnects, with support for Myrinet/MX, and QLogic PSM-based
  networks.
- Addition of "udapl" BTL for transport across uDAPL interconnects.
- Really check that the $CXX given to configure is a C++ compiler
  (not a C compiler that "sorta works" as a C++ compiler).
- Properly check for local host only addresses properly, looking
  for 127.0.0.0/8, rather than just 127.0.0.1.


1.1.5: 19 Mar 2007
------------------

- Implement MPI_TYPE_CREATE_DARRAY function.
- Fix race condition in shared memory BTL startup that could cause MPI
  applications to hang in MPI_INIT.
- Fix syntax error in a corner case of the event library.  Thanks to
  Bert Wesarg for pointing this out.
- Add new MCA parameter (mpi_preconnect_oob) for pre-connecting the
  "out of band" channels between all MPI processes.  Most helpful for
  MPI applications over InfiniBand where process A sends an initial
  message to process B, but process B does not enter the MPI library
  for a long time.
- Fix for a race condition in shared memory locking semantics.
- Add major, minor, and release version number of Open MPI to mpi.h.
  Thanks to Martin Audet for the suggestion.
- Fix the "restrict" compiler check in configure.
- Fix a problem with argument checking in MPI_TYPE_CREATE_SUBARRAY.
- Fix a problem with compiling the XGrid components with non-gcc
  compilers.


1.1.4: 30 Jan 2007
------------------

- Fixed 64-bit alignment issues with TCP interface detection on
  intel-based OS X machines.
- Adjusted TCP interface selection to automatically ignore Linux
  channel-bonded slave interfaces.
- Fixed the type of the first parameter to the MPI F90 binding for
  MPI_INITIALIZED.  Thanks to Tim Campbell for pointing out the
  problem.
- Fix a bunch of places in the Fortran MPI bindings where (MPI_Fint*)
  was mistakenly being used instead of (MPI_Aint*).
- Fixes for fortran MPI_STARTALL, which could sometimes return
  incorrect request values.  Thanks to Tim Campbell for pointing out
  the problem.
- Include both pre- and post-MPI-2 errata bindings for
  MPI::Win::Get_attr.
- Fix math error on Intel OS X platforms that would greatly increase
  shared memory latency.
- Fix type casting issue with MPI_ERRCODES_IGNORE that would cause
  errors when using a C++ compiler.  Thanks to Barry Smith for
  bringing this to our attention.
- Fix possible segmentation fault during shutdown when using the
  MX BTL.


1.1.3: 26 Jan 2007
------------------

- Remove the "hierarch" coll component; it was not intended to be
  included in stable releases yet.
- Fix a race condition with stdout/stderr not appearing properly from
  all processes upon termination of an MPI job.
- Fix internal accounting errors with the self BTL.
- Fix typos in the code path for when sizeof(int) != sizeof(INTEGER)
  in the MPI F77 bindings functions.  Thanks to Pierre-Matthieu
  Anglade for bringing this problem to our attention.
- Fix for a memory leak in the derived datatype function
  ompi_ddt_duplicate().  Thanks to Andreas Schäfer for reporting,
  diagnosing, and patching the leak.
- Used better performing basic algorithm for MPI_ALLGATHERV.
- Added a workaround for a bug in the Intel 9.1 C++ compiler (all
  versions up to and including 20060925) in the MPI C++ bindings that
  caused run-time failures.  Thanks to Scott Weitzenkamp for reporting
  this problem.
- Fix MPI_SIZEOF implementation in the F90 bindings for COMPLEX
  variable types.
- Fixes for persistent requests involving MPI_PROC_NULL.  Thanks to
  Lisandro Dalcín for reporting the problem.
- Fixes to MPI_TEST* and MPI_WAIT* for proper MPI exception reporting.
  Thanks to Lisandro Dalcín for finding the issue.
- Various fixes for MPI generalized request handling; addition of
  missing MPI::Grequest functionality to the C++ bindings.
- Add "mpi_preconnect_all" MCA parameter to force wireup of all MPI
  connections during MPI_INIT (vs. making connections lazily whenever
  the first MPI communication occurs between a pair of peers).
- Fix a problem for when $FC and/or $F77 were specified as multiple
  tokens.  Thanks to Orion Poplawski for identifying the problem and
  to Ralf Wildenhues for suggesting the fix.
- Fix several MPI_*ERRHANDLER* functions and MPI_GROUP_TRANSLATE_RANKS
  with respect to what arguments they allowed and the behavior that
  they effected.  Thanks to Lisandro Dalcín for reporting the
  problems.


1.1.2: 18 Oct 2006
------------------

- Really fix Fortran status handling in MPI_WAITSOME and MPI_TESTSOME.
- Various datatype fixes, reported by several users as causing
  failures in the BLACS testing suite.  Thanks to Harald Forbert, Åke
  Sandgren and, Michael Kluskens for reporting the problem.
- Correctness and performance fixes for heterogeneous environments.
- Fixed a error in command line parsing on some platforms (causing
  mpirun to crash without doing anything).
- Fix for initialization hangs on 64 bit Mac OS X PowerPC systems.
- Fixed some memory allocation problems in mpirun that could cause
  random problems if "-np" was not specified on the command line.
- Add Kerberos authentication support for XGrid.
- Added LoadLeveler support for jobs larger than 128 tasks.
- Fix for large-sized Fortran LOGICAL datatypes.
- Fix various error checking in MPI_INFO_GET_NTHKEY and
  MPI_GROUP_TRANSLATE_RANKS, and some collective operations
  (particularly with regards to MPI_IN_PLACE).  Thanks to Lisandro
  Dalcín for reporting the problems.
- Fix receiving messages to buffers allocated by MPI_ALLOC_MEM.
- Fix a number of race conditions with the MPI-2 Onesided
  interface.
- Fix the "tuned" collective componenete where some cases where
  MPI_BCAST could hang.
- Update TCP support to support non-uniform TCP environments.
- Allow the "poe" RAS component to be built on AIX or Linux.
- Only install mpif.h if the rest of the Fortran bindings are
  installed.
- Fixes for BProc node selection.
- Add some missing Fortran MPI-2 IO constants.


1.1.1: 28 Aug 2006
------------------

- Fix for Fortran string handling in various MPI API functions.
- Fix for Fortran status handling in MPI_WAITSOME and MPI_TESTSOME.
- Various fixes for the XL compilers.
- Automatically disable using mallot() on AIX.
- Memory fixes for 64 bit platforms with registering MCA parameters in
  the self and MX BTL components.
- Fixes for BProc to support oversubscription and changes to the
  mapping algorithm so that mapping processes "by slot" works as
  expected.
- Fixes for various abort cases to not hang and clean up nicely.
- If using the Intel 9.0 v20051201 compiler on an IA64 platform, the
  ptmalloc2 memory manager component will automatically disable
  itself.  Other versions of the Intel compiler on this platform seem
  to work fine (e.g., 9.1).
- Added "host" MPI_Info key to MPI_COMM_SPAWN and
  MPI_COMM_SPAWN_MULTIPLE.
- Add missing C++ methods: MPI::Datatype::Create_indexed_block,
  MPI::Datatype::Create_resized, MPI::Datatype::Get_true_extent.
- Fix OSX linker issue with Fortran bindings.
- Fixed MPI_COMM_SPAWN to start spawning new processes in slots that
  (according to Open MPI) are not already in use.
- Added capability to "mpirun a.out" (without specifying -np) that
  will run on all currently-allocated resources (e.g., within a batch
  job such as SLURM, Torque, etc.).
- Fix a bug with one particular case of MPI_BCAST.  Thanks to Doug
  Gregor for identifying the problem.
- Ensure that the shared memory mapped file is only created when there
  is more than one process on a node.
- Fixed problems with BProc stdin forwarding.
- Fixed problem with MPI_TYPE_INDEXED datatypes.  Thanks to Yven
  Fournier for identifying this problem.
- Fix some thread safety issues in MPI attributes and the openib BTL.
- Fix the BProc allocator to not potentially use the same resources
  across multiple ORTE universes.
- Fix gm resource leak.
- More latency reduction throughout the code base.
- Make the TM PLS (PBS Pro, Torque, Open PBS) more scalable, and fix
  some latent bugs that crept in v1.1.  Thanks to the Thunderbird crew
  at Sandia National Laboratories and Martin Schaffoner for access to
  testing facilities to make this happen.
- Added new command line options to mpirun:
  --nolocal: Do not run any MPI processes on the same node as mpirun
    (compatibility with the OSC mpiexec launcher)
  --nooversubscribe: Abort if the number of processes requested would
    cause oversubscription
  --quiet / -q: do not show spurious status messages
  --version / -V: show the version of Open MPI
- Fix bus error in XGrid process starter.  Thanks to Frank from the
  Open MPI user's list for identifying the problem.
- Fix data size mismatches that caused memory errors on PPC64
  platforms during the startup of the openib BTL.
- Allow propagation of SIGUSR1 and SIGUSR2 signals from mpirun to
  back-end MPI processes.
- Add missing MPI::Is_finalized() function.


1.1: 23 Jun 2006
----------------

- Various MPI datatype fixes, optimizations.
- Fixed various problems on the SPARC architecture (e.g., not
  correctly aligning addresses within structs).
- Improvements in various run-time error messages to be more clear
  about what they mean and where the errors are occurring.
- Various fixes to mpirun's handling of --prefix.
- Updates and fixes for Cray/Red Storm support.
- Major improvements to the Fortran 90 MPI bindings:
  - General improvements in compile/linking time and portability
    between different F90 compilers.
  - Addition of "trivial", "small" (the default), and "medium"
    Fortran 90 MPI module sizes (v1.0.x's F90 module was
    equivalent to "medium").  See the README file for more
    explanation.
  - Fix various MPI F90 interface functions and constant types to
    match.  Thanks to Michael Kluskens for pointing out the problems
    to us.
- Allow short messagees to use RDMA (vs. send/receive semantics) to a
  limited number peers in both the mvapi and openib BTL components.
  This reduces communication latency over IB channels.
- Numerous performance improvements throughout the entire code base.
- Many minor threading fixes.
- Add a define OMPI_SKIP_CXX to allow the user to skip the mpicxx.h from
  being included in mpi.h. It allows the user to compile C code with a CXX
  compiler without including the CXX bindings.
- PERUSE support has been added. In order to activate it add
  --enable-peruse to the configure options. All events described in
  the PERUSE 2.0 draft are supported, plus one Open MPI
  extension. PERUSE_COMM_REQ_XFER_CONTINUE allow to see how the data
  is segmented internally, using multiple interfaces or the pipeline
  engine. However, this version only support one event of each type
  simultaneously attached to a communicator.
- Add support for running jobs in heterogeneous environments.
  Currently supports environments with different endianness and
  different representations of C++ bool and Fortran LOGICAL.
  Mismatched sizes for other datatypes is not supported.
- Open MPI now includes an implementation of the MPI-2 One-Sided
  Communications specification.
- Open MPI is now configurable in cross-compilation environments.
  Several Fortran 77 and Fortran 90 tests need to be pre-seeded with
  results from a config.cache-like file.
- Add --debug option to mpirun to generically invoke a parallel debugger.


1.0.3: Not released (all fixes included in 1.1)
-----------------------------------------------

- Fix a problem noted by Chris Hennes where MPI_INFO_SET incorrectly
  disallowed long values.
- Fix a problem in the launch system that could cause inconsistent
  launch behavior, particularly when launching large jobs.
- Require that the openib BTL find <sysfs/libsysfs.h>.  Thanks to Josh
  Aune for the suggestion.
- Include updates to support the upcoming Autoconf 2.60 and Libtool
  2.0.  Thanks to Ralf Wildenhues for all the work!
- Fix bug with infinite loop in the "round robin" process mapper.
  Thanks to Paul Donohue for reporting the problem.
- Enusre that memory hooks are removed properly during MPI_FINALIZE.
  Thanks to Neil Ludban for reporting the problem.
- Various fixes to the included support for ROMIO.
- Fix to ensure that MPI_LONG_LONG and MPI_LONG_LONG_INT are actually
  synonyms, as defined by the MPI standard.  Thanks to Martin Audet
  for reporting this.
- Fix Fortran 90 configure tests to properly utilize LDFLAGS and LIBS.
  Thanks to Terry Reeves for reporting the problem.
- Fix shared memory progression in asynchronous progress scenarios.
  Thanks to Mykael Bouquey for reporting the problem.
- Fixed back-end operations for predefined MPI_PROD for some
  datatypes.  Thanks to Bert Wesarg for reporting this.
- Adapted configure to be able to handle Torque 2.1.0p0's (and above)
  new library name.  Thanks to Brock Palen for pointing this out and
  providing access to a Torque 2.1.0p0 cluster to test with.
- Fixed situation where mpirun could set a shell pipeline's stdout
  to non-blocking, causing the shell pipeline to prematurely fail.
  Thanks to Darrell Kresge for figuring out what was happening.
- Fixed problems with leave_pinned that could cause Badness with the
  mvapi BTL.
- Fixed problems with MPI_FILE_OPEN and non-blocking MPI-2 IO access.
- Fixed various InfiniBand port matching issues during startup.
  Thanks to Scott Weitzenkamp for identifying these problems.
- Fixed various configure, build and run-time issues with ROMIO.
  Thanks to Dries Kimpe for bringing them to our attention.
- Fixed error in MPI_COMM_SPLIT when dealing with intercommunicators.
  Thanks to Bert Wesarg for identifying the problem.
- Fixed backwards handling of "high" parameter in MPI_INTERCOMM_MERGE.
  Thanks to Michael Kluskens for pointing this out to us.
- Fixed improper handling of string arguments in Fortran bindings
  for MPI-IO functionality
- Fixed segmentation fault with 64 bit applications on Solaris when
  using the shared memory transports.
- Fixed MPI_COMM_SELF attributes to free properly at the beginning of
  MPI_FINALIZE.  Thanks to Martin Audet for bringing this to our
  attention.
- Fixed alignment tests for cross-compiling to not cause errors with
  recent versions of GCC.


1.0.2: 7 Apr 2006
-----------------

- Fixed assembly race condition on AMD64 platforms.
- Fixed residual .TRUE. issue with copying MPI attributes set from
  Fortran.
- Remove unnecessary logic from Solaris pty I/O forwarding.  Thanks to
  Francoise Roch for bringing this to our attention.
- Fixed error when count = 0 was given for multiple completion MPI
  functions (MPI_TESTSOME, MPI_TESTANY, MPI_TESTALL, MPI_WAITSOME,
  MPI_WAITANY, MPI_WAITALL).
- Better handling in MPI_ABORT for when peer processes have already
  died, especially under some resource managers.
- Random updates to README file, to include notes about the Portland
  compilers.
- Random, small threading fixes to prevent deadlock.
- Fixed a problem with handling long mpirun app files.  Thanks to Ravi
  Manumachu for identifying the problem.
- Fix handling of strings in several of the Fortran 77 bindings.
- Fix LinuxPPC assembly issues.  Thanks to Julian Seward for reporting
  the problem.
- Enable pty support for standard I/O forwarding on platforms that
  have ptys but do not have openpty().  Thanks to Pierre Valiron for
  bringing this to our attention.
- Disable inline assembly for PGI compilers to avoid compiler errors.
  Thanks to Troy Telford for bringing this to our attention.
- Added MPI_UNSIGNED_CHAR and MPI_SIGNED_CHAR to the allowed reduction
  types.
- Fix a segv in variable-length message displays on Opterons running
  Solaris.  Thanks to Pierre Valiron for reporting the issue.
- Added MPI_BOOL to the intrinsic reduction operations MPI_LAND,
  MPI_LOR, MPI_LXOR.  Thanks to Andy Selle for pointing this out to us.
- Fixed TCP BTL network matching logic during MPI_INIT; in some cases
  on multi-NIC nodes, a NIC could get paired with a NIC on another
  network (typically resulting in deadlock).  Thanks to Ken Mighell
  for pointing this out to us.
- Change the behavior of orterun (mpirun, mpirexec) to search for
  argv[0] and the cwd on the target node (i.e., the node where the
  executable will be running in all systems except BProc, where the
  searches are run on the node where orterun is invoked).
- Fix race condition in shared memory transport that could cause
  crashes on machines with weak memory consistency models (including
  POWER/PowerPC machines).
- Fix warnings about setting read-only MCA parameters on bproc systems.
- Change the exit status set by mpirun when an application process is
  killed by a signal.  The exit status is now set to signo + 128, which
  conforms with the behavior of (almost) all shells.
- Correct a datatype problem with the convertor when partially
  unpacking data. Now we can position the convertor to any position
  not only on the predefined types boundaries. Thanks to Yvan Fournier
  for reporting this to us.
- Fix a number of standard I/O forwarding issues, including the
  ability to background mpirun and a loss of data issue when
  redirecting mpirun's standard input from a file.
- Fixed bug in ompi_info where rcache and bml MCA parameters would not
  be displayed.
- Fixed umask issues in the session directory.  Thanks to Glenn Morris
  for reporting this to us.
- Fixed tcsh-based LD_LIBRARY_PATH issues with --prefix.  Thanks to
  Glen Morris for identifying the problem and suggesting the fix.
- Removed extraneous \n's when setting PATH and LD_LIBRARY_PATH in the
  rsh startup.  Thanks to Glen Morris for finding these typos.
- Fixed missing constants in MPI C++ bindings.
- Fixed some errors caused by threading issues.
- Fixed openib BTL flow control logic to not overrun the number of
  send wqes available.
- Update to match newest OpenIB user-level library API.  Thanks to
  Roland Dreier for submitting this patch.
- Report errors properly when failing to register memory in the openib
  BTL.
- Reduce memory footprint of openib BTL.
- Fix parsing problem with mpirun's "-tv" switch.  Thanks to Chris
  Gottbrath for supplying the fix.
- Fix Darwin net/if.h configure warning.
- The GNU assembler unbelievably defaults to making stacks executable.
  So when using gas, add flags to explicitly tell it to not make
  stacks executable (lame but necessary).
- Add missing MPI::Request::Get_status() methods.  Thanks to Bill
  Saphir for pointing this out to us.
- Improved error messages on memory registration errors (e.g., when
  using high-speed networks).
- Open IB support now checks firmware for how many outstanding RDMA
  requests are supported.  Thanks to Mellanox for pointing this out to
  us.
- Enable printing of stack traces in MPI processes upon SIGBUS,
  SIGSEGV, and SIGFPE if the platform supports it.
- Fixed F90 compilation support for the Lahey compiler.
- Fixed issues with ROMIO shared library support.
- Fixed internal accounting problems with rsh support.
- Update to GNU Libtool 1.5.22.
- Fix error in configure script when setting CCAS to ias (the Intel
  assembler).
- Added missing MPI::Intercomm collectives.
- Fixed MPI_IN_PLACE handling for Fortran collectives.
- Fixed some more C++ const_cast<> issues.  Thanks for Martin Audet
  (again) for bringing this to our attention.
- Updated ROMIO with the version from MPICH 1.2.7p1, marked as version
  2005-06-09.
- Fixes for some cases where the use of MPI_BOTTOM could cause
  problems.
- Properly handle the case where an mVAPI does not have shared receive
  queue support (such as the one shipped by SilverStorm / Infinicon
  for OS X).


1.0.1: 12 Dec 2005
------------------

- Fixed assembly on Solaris AMD platforms.  Thanks to Pierre Valiron
  for bringing this to our attention.
- Fixed long messages in the send-to-self case.
- Ensure that when the "leave_pinned" option is used, the memory hooks
  are also enabled.  Thanks to Gleb Natapov for pointing this out.
- Fixed compile errors for IRIX.
- Allow hostfiles to have integer host names (for BProc clusters).
- Fixed a problem with message matching of out-of-order fragments in
  multiple network device scenarios.
- Converted all the C++ MPI bindings to use proper const_cast<>'s
  instead of old C-style casts to get rid of const-ness.  Thanks to
  Martin Audet for raising the issue with us.
- Converted MPI_Offset to be a typedef instead of a #define because it
  causes problems for some C++ parsers.  Thanks to Martin Audet for
  bringing this to our attention.
- Improved latency of TCP BTL.
- Fixed index value in MPI_TESTANY to be MPI_UNDEFINED if some
  requests were not MPI_REQUEST_NULL, but no requests finished.
- Fixed several Fortran MPI API implementations that incorrectly used
  integers instead of logicals or address-sized integers.
- Fix so that Open MPI correctly handles the Fortran value for .TRUE.,
  regardless of what the Fortran compiler's value for .TRUE. is.
- Improved scalability of MX startup.
- Fix datatype offset handling in the coll basic component's
  MPI_SCATTERV implementation.
- Fix EOF handling on stdin.
- Fix missing MPI_F_STATUS_IGNORE and MPI_F_STATUSES_IGNORE
  instanatiations.  Thanks to Anthony Chan for pointing this out.
- Add a missing value for MPI_WIN_NULL in mpif.h.
- Bring over some fixes for the sm btl that somehow didn't make it
  over from the trunk before v1.0.  Thanks to Beth Tibbitts and Bill
  Chung for helping identify this issue.
- Bring over some fixes for the iof that somehow didn't make it over
  from the trunk before v1.0.
- Fix for --with-wrapper-ldflags handling.  Thanks to Dries Kimpe for
  pointing this out to us.


1.0: 17 Nov 2005
----------------

Initial public release.
