TestDMDAVec [using mpi-io]
*** PetscViewer[write] using MPI-IO ***
*** PetscViewer[write] skipping header ***
*** PetscViewer[load] skipping header ***
*** PetscViewer[load] using MPI-IO ***
VecCompare
  min(a)   = +0.00e+00 [loc 0]
  max(a)   = +2.81e+03 [loc 359]
  min(b)   = +0.00e+00 [loc 0]
  max(b)   = +2.81e+03 [loc 359]
  min(a-b) < 1.0e-10
Headerless read of data verified for: dmda-mpiio.pbvec
