coll: reduce_scatter_block: add recursive halving algorithm #5163
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Can one of the admins verify this patch? |
bosilca
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May 14, 2018
| * index: 0 1 2 3 4 ... r r+1 r+2 ... nproc_pof2 | ||
| * value: 2 2 2 2 2 ... 2 1 1 ... 1 | ||
| */ | ||
| static int range_sum(int a, int b, int r) |
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ok to test |
Signed-off-by: Mikhail Kurnosov <mkurnosov@gmail.com>
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bosilca
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May 15, 2018
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Implements recursive halving algorithm for
MPI_Reduce_scatter_block. The algorithm can be used by commutative operations only.Signed-off-by: Mikhail Kurnosov mkurnosov@gmail.com