Add mpi large-message support from mpich 4.x to vtkMPICommunicator
Variants of mpi calls allow for message lengths > MAX_INT in mpi 4.x and later. Checks the MPI_VERSION to enable. Makes 64bit versions of methods available and checks for overflow if large messages aren't available.
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- Documentation/release/dev/mpich4-large-message-support.md 5 additions, 0 deletionsDocumentation/release/dev/mpich4-large-message-support.md
- Parallel/MPI/vtkMPICommunicator.cxx 441 additions, 30 deletionsParallel/MPI/vtkMPICommunicator.cxx
- Parallel/MPI/vtkMPICommunicator.h 40 additions, 6 deletionsParallel/MPI/vtkMPICommunicator.h
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