On Mar 27, 2009, at 18:20 , Craig Tierney wrote:
What about using multi-rail to increase message rate? That isn't the same as latency, but if you put messages on both wires you should get more.
Exactly why we saw almost 2x speedup on message rate (latency) sensitive apps using Platform MPI. We call the technique alternating; any communicating peer will use a HCA or port, but a single MPI process will alternate between different HCAs (or ports), depending on which peer he communicates with.
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