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Brian Barrett 93a2f31932 Use a recursive halving communication algorithm similar to the one used by
MPICH2 for "small" commutative operations in the reduce_scatter basic
implementation.  "small" is currently pretty big, as it doesn't take
much to beat reduce/scatterv.  Need to do much more than this for
better all around performance of MPI_Reduce_scatter, but this was enough
to solve the problems I was having.

This commit was SVN r13348.
2007-01-29 19:29:35 +00:00
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