v5.0.x: Backport alltoall{,v,w} in place fixes #9671
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b9012a3 accidently set the message tags for the alltoall and alltoallv in place algorithms to the alltoallw tag. Undo that change. Signed-off-by: Brian Barrett <[email protected]> (cherry picked from commit f32dc49)
b9012a3 used the alltoallw interpretation of rdisps instead of the alltoall/alltoallv interpretation. According to the MPI standard, the byte displacement is recvbuf + rdispls[i] * extent(recvtype) for alltoall and alltoallv, but is recvbuf + rdispls[i] for alltoallw. Signed-off-by: Brian Barrett <[email protected]> (cherry picked from commit d8c50a5)
Without waiting for the last receive before going to the next iteration we might overwrite data if the current left neighbor become the right at the next iteration. Start with an MPI_REQUEST_NULL request. If the request is not NULL and the first rcounts is 0, the ompi_request_wait will segfault. Signed-off-by: George Bosilca <[email protected]> (cherry picked from commit 6802702) Signed-off-by: Brian Barrett <[email protected]>
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Nov 16, 2021
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Handfull of fixes to alltoall{,v,w} in_place. Fixes #9501 and #9329 for the v5.0 series.