osc/ucx: implement rput and rget using ucp_worker_flush_nb #10536
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Fallback to the old method of acquiring a request from an atomic operation is preserved. Some networks might provide better performance if the request-based operations do not rely on atomic operations. Some minor fixes to opal_common_ucx_winfo_flush included in this commit. Signed-off-by: Joseph Schuchart <schuchart@icl.utk.edu>
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bot:retest |
janjust
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Jul 5, 2022
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@devreal please open up a v5.0 of this PR |
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Based on a reply by @yosefe in #9580 (comment) it appears that the way osc/ucx implements request based put and get operations might not work well on older networks. This is an attempt at using
ucp_worker_flush_nbinstead to acquire a request that completes once the put or get operations have completed without explicitly posting an atomic operation. I don't know the implementation details ofucp_worker_flush_nbbut it seems like a cleaner solution to me.Fallback to the old method of acquiring a request from an atomic operation is preserved in case
ucp_worker_flush_nbis not available.Some minor fixes to
opal_common_ucx_winfo_flushare also included in this PR.@janjust @yosefe is this the correct use of
ucp_worker_flush_nb?@jotabf fyi this might solve the performance issue you're seeing with
MPI_Rget. I haven't been able to test it on a network like yours though.Signed-off-by: Joseph Schuchart schuchart@icl.utk.edu