Workaround for MPICH MPIX_Query_cuda_support assertion error #4824
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For MPICH < 4, MPIX_Query_cuda_support will trigger an assertion error if its call to PMPIX_GPU_query_support returns an error code. Here, we work around it by calling MPIX_GPU_query_support directly. If it returns an error code, it is treated as not supporting CUDA.
atmyers
approved these changes
Dec 3, 2025
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For MPICH < 4, MPIX_Query_cuda_support will trigger an assertion error if its call to PMPIX_GPU_query_support returns an error code. Here, we work around it by calling MPIX_GPU_query_support directly. If it returns an error code, it is treated as not supporting CUDA.
Close #4820