Commit c8435ec4 authored by Committed by Sangmin SeoBrowse files
Better implementation of MPI_Allreduce for intercommunicator.
The patch provides a better implementation where each group does a intra-reduce concurrently, exchanges the reduce result, and broadcasts in the group. The current implementation had a problem of serializing intra-reduces of each group. Fixes ticket #2074. Signed-off-by: Sangmin Seo <firstname.lastname@example.org>