Re: [OMPI devel] RFC: sm Latency

[Eugene Loh]

Ron Brightwell wrote: If you poll only the queue that correspond to a posted receive, you only optimize micro-benchmarks, until they start using ANY_SOURCE. Note that the HPCC RandomAccess benchmark only uses MPI_ANY_SOURCE (and MPI_ANY_TAG). But HPCC RandomAccess also just uses non-blocking receives.  So, it's kind of outside the scope of the original ideas here (bypassing the PML receive-request data structure). It's possibly not even a poster child for the single-queue idea either.  Single queue probably shines best when you have to poll all connections for a few messages.  In contrast, RandomAccess (I think) loads all connections up randomly (pseudo-evenly).