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
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Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany
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