# 17.2.477. MPIX_Query_rocm_support

MPIX_Query_rocm_support - Returns 1 if there is AMD ROCm-aware support and 0 if there is not.

## 17.2.477.1. SYNTAX

### 17.2.477.1.1. C Syntax

    #include <mpi.h>
    #include <mpi-ext.h>

    int MPIX_Query_rocm_support(void)

### 17.2.477.1.2. Fortran Syntax

There is no Fortran binding for this function.

### 17.2.477.1.3. C++ Syntax

There is no C++ binding for this function.

## 17.2.477.2. DESCRIPTION

This function is part of an Open MPI extension; it is not part of standard MPI.

This routine returns 1 if both the MPI library was built with the AMD ROCm library and the runtime supports ROCm buffers. Otherwise, it returns 0. This routine must be called after MPI is initialized, e.g., by a call to MPI_Init(3) or MPI_Init_thread(3).

Including the Open MPI-specific file `<mpi-ext.h>` will define the C preprocessor macro `OMPI_HAVE_MPI_EXT` to `1`. Otherwise, it will be undefined. This macro can be used by applications as a sentinel to know whether `<mpi-ext.h>` has been included or not.

The Open MPI ROCm extension is built by default (regardless of whether or not Open MPI was built with ROCm support), but could have been disabled by an administrative action. It is therefore safest for applications to check that the preprocessor macro `OMPI_HAVE_MPI_EXT_ROCM` is defined and is set to 1 to know whether the `MPIX_Query_rocm_support()` function is available. Checking for this macro also protects the use of this function when compiling the application with older versions of Open MPI or other MPI implementations that do not have this function.

### 17.2.477.2.1. EXAMPLES

    #include <stdio.h>
    #include <mpi.h>
    #include <mpi-ext.h> /* Needed for ROCm-aware check */

    int main(int argc, char *argv[])
    {
        MPI_Init(&argc, &argv);

        bool happy = false;
    #if defined(OMPI_HAVE_MPI_EXT_ROCM) && OMPI_HAVE_MPI_EXT_ROCM
        happy = (bool) MPIX_Query_rocm_support();
    #endif

        if (happy) {
            printf("This Open MPI installation has ROCm-aware support.\n");
        } else {
            printf("This Open MPI installation does not have ROCm-aware support.\n");
        }

        MPI_Finalize();
        return 0;
    }

See also

- MPIX_Query_cuda_support