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Workaround for MPICH MPIX_Query_cuda_support assertion error #4824

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Merged
merged 1 commit into from
Dec 3, 2025
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Merged

Workaround for MPICH MPIX_Query_cuda_support assertion error #4824

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7 changes: 6 additions & 1 deletion Src/Base/AMReX_ParallelDescriptor.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1544,8 +1544,13 @@ Initialize ()
{
#if defined(AMREX_USE_CUDA)

#if (defined(OMPI_HAVE_MPI_EXT_CUDA) && OMPI_HAVE_MPI_EXT_CUDA) || (defined(MPICH) && defined(MPIX_GPU_SUPPORT_CUDA))
#if defined(OMPI_HAVE_MPI_EXT_CUDA) && OMPI_HAVE_MPI_EXT_CUDA
use_gpu_aware_mpi = (bool) MPIX_Query_cuda_support();
#elif defined(MPICH) && defined(MPIX_GPU_SUPPORT_CUDA)
int is_supported = 0;
if (MPIX_GPU_query_support(MPIX_GPU_SUPPORT_CUDA, &is_supported) == MPI_SUCCESS) {
use_gpu_aware_mpi = (bool) is_supported;
}
#endif

#elif defined(AMREX_USE_HIP)
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