btl/scif: reduce default exclusivity #1201
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This commit reduces the default exclusivity so that btl/scif is not used for send/recv over other shared memory transports. Fixes open-mpi/ompi#1712 Signed-off-by: Nathan Hjelm <hjelmn@lanl.gov> (cherry picked from open-mpi/ompi@5caf12c) Signed-off-by: Nathan Hjelm <hjelmn@lanl.gov>
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:bot🏷️bug @hppritcha Very minor bug affecting out-of-the-box performance when scif is installed. btl/scif was never intended to beat vader or sm. |
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Test PASSed. |
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The problem is only partially fixed: because in 2.x multirail is on by default, even when SCIF does not have a high exclusivity, it gets loaded for larger message sizes where the message is stripped on multiple transports (1 frag on vader, 1 frag on scif), leading again to poor performance in that setup. |
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@abouteiller Can you try setting btl_scif_latency to a higher number and see if that helps. 100000 should be high enough. |
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the remaining problem is in TCP btl issue, so this is a correct fix without further work needed. |
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@hppritcha This is minor change, it has already been integrated in 1.10, I think it should be integrated in v2.0.0. |
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Discussed on 2016-06-14 webex; approved for v2.0.0. |
6 participants
This commit reduces the default exclusivity so that btl/scif is not
used for send/recv over other shared memory transports.
Fixes open-mpi/ompi#1712
Signed-off-by: Nathan Hjelm hjelmn@lanl.gov
(cherry picked from open-mpi/ompi@5caf12c)
Signed-off-by: Nathan Hjelm hjelmn@lanl.gov