ompi/communicator: do not use MPI_IN_PLACE for iallreduce callback #12246
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This bug was revealed in MTT communicator tests open-mpi#12245 The root cause is that the iallreduce callback is called on the parent communicator, which can be an inter-communicator. In this case, the fix should be using a dedicated sendbuf for the callback. Signed-off-by: Wenduo Wang <wenduwan@amazon.com>
hppritcha
approved these changes
Jan 19, 2024
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This bug was revealed in MTT communicator tests #12245
The root cause is that the iallreduce callback is called on the parent communicator, which can be an inter-communicator.
In this case, the fix should be using a dedicated sendbuf for the callback.