Thanks, those were good suggestions. On 11:53 Fri 09 Jul , Peter Kjellstrom wrote: > On an E5520 (nehalem) node I get ~5 GB/s ping-pong for >64K sizes.
I just tried a Core i7 system which maxes at 6550 MB/s for the ping-pong test. > On QDR IB on similar nodes I get ~3 GB/s ping-pong for >256K. I'll try to find a Intel system to repeat the tests. Maybe it's AMD's different memory subsystem/cache architecture which is slowing Open MPI? Or are my systems just badly configured? Best -Andreas -- ========================================================== Andreas Schäfer HPC and Grid Computing Chair of Computer Science 3 Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany +49 9131 85-27910 PGP/GPG key via keyserver I'm a bright... http://www.the-brights.net ========================================================== (\___/) (+'.'+) (")_(") This is Bunny. Copy and paste Bunny into your signature to help him gain world domination!
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