On Nov 28, 2007, at 8:49 AM, Charlie Peck wrote:

On Nov 28, 2007, at 8:04 AM, Jeffrey B. Layton wrote:

Unless you are using a gigabit ethernet, Open-MPI is noticeably less efficient that LAM-MPI over that fabric.

I suspect at some point in the future gige will catch-up but for now my (limited) understanding is that the Open-MPI folks are focusing their time on higher bandwidth/lower latency fabrics than gige.

charlie


At SC07 MPICH2 BoF, I gave a brief talk about MPICH2-MX. In addition to showing results of it running over MX-10G, I had a few slides showing performance using MPICH2-MX over Open-MX on Intel e1000 drivers (80003ES2LAN NICs). IMB Pingpong latency is ~10 us for small messages and throughput for large messages is near line rate.

Open-MX provides the same API as MX, runs on _any_ Ethernet driver/ NIC, should work with most MX software (MPICH-MX, MPICH2-MX, PVFS2, etc.) and is open source. It has not reached a release tarball yet, but we expect to see one soon.

Scott
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