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George Bosilca 0f0c27a184
Allow MPI_PROC_NULL as neighbor.
Allowing MPI_PROC_NULL as a neighbor in any topology allows us to add
gaps on the send and recv buffers. This does make the traditional
neighbor collective have a similar behavior as the V version, but in
same time it allows the users to skip the step where they prepare the
counts and the displacement array.

For more info please take a look at issue #4675.

Signed-off-by: George Bosilca <bosilca@icl.utk.edu>
2018-03-09 12:20:26 +09:00
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