v3.0.x: neighbor alltoall fix #7245
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This commit updates the coll/basic component to correctly order sends and receives for cartesian communicators with cyclic boundaries. This addresses an issue identified by mpi-forum/mpi-issues#153. This issue occurs when the size in any dimension is 1. This gives the same neighbor in the positive and negative directions. The old code was sending and receiving in the same order so the -1 buffer contained the +1 result and vise-versa. The problem is addressed by using unique tags for each send. This should cover both the case where overtaking is allowed and is not allowed. The former case will be possible is a MPI_Cart_create_with_info() call is added to the standard. Signed-off-by: Nathan Hjelm <hjelmn@google.com> (cherry picked from commit 196a91e)
This work is rooted in the [MPI Forum issue 153](mpi-forum/mpi-issues#153). Signed-off-by: George Bosilca <bosilca@icl.utk.edu> (cherry picked from commit 86acdee)
bosilca
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Dec 17, 2019
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Cherry picked from master; see individual commit messages.
Refs #7232