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Revert "In irregular.cpp use simpler and slightly faster…

Authored by Axel Kohlmeyer <akohlmey@gmail.com> on Mar 17 2017, 16:35.

Description

Revert "In irregular.cpp use simpler and slightly faster MPI_Reduce_scatter_block()"

This reverts commit 8e75616c144d7d75b7163e0f79668b7429de2126.