Adding function for MPI communicators in Fortran integer format to simplify Fortran interfaces.#92
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romerojosh merged 2 commits intomainfrom Sep 25, 2025
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…mplify Fortran interfaces. Signed-off-by: Josh Romero <joshr@nvidia.com>
Signed-off-by: Josh Romero <joshr@nvidia.com>
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Reusing an idea from another library I maintain (see: NVIDIA/TorchFort#81).
This PR adds a cuDecomp initialization function (
cudecompInit_F) in C/C++ that takes anMPI_Fintfor the MPI communicator. The reasoning for this is thatMPI_Commis not consistently defined across MPI implementations and introduces ABI compatibility issues.These new functions also enable us to simplify the current Fortran MPI communicator handling in our interfaces, removing any need to convert Fortran MPI communicators to their C counterparts. A secondary benefit is that this also removes all the special case handling for MPICH, which does not have a
MPI_Comm_f2cfunction available.