On Monday 06 December 2010 15:03:13 Mathieu Gontier wrote: > Hi, > > A small update. > My colleague made a mistake and there is no arithmetic performance > issue. Sorry for bothering you. > > Nevertheless, one can observed some differences between MPICH and > OpenMPI from 25% to 100% depending on the options we are using into our > software. Tests are lead on a single SGI node on 6 or 12 processes, and > thus, I am focused on the sm option.
A few previous threads on sm performance have been related to what /tmp is. OpenMPI relies on (or at least used to rely on) this being backed by page cache (tmpfs, a local ext3 or similar). I'm not sure what the behaviour is in the latest version but then again you didn't say which version you've tried. /Peter
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