[Beowulf] Performance degrading
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Glen Beane Glen.Beane at jax.orgTue Dec 15 12:10:47 PST 2009
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On 12/15/09 2:36 PM, "Gus Correa" <gus at ldeo.columbia.edu> wrote: If you have single quad core nodes as you said, then top shows that you are oversubscribing the cores. There are five nwchem processes are running. It has been a very long time, but wasn't that normal behavior for mpich under certain instances? If I recall correctly it had an extra process that was required by the implementation. I don't think it returned from MPI_Init, so you'd have a bunch of processes consuming nearly a full CPU and then one that was mostly idle doing something behind the scenes. I don't remember if this was for mpich/p4 (with or without -with-comm=shared) or for mpich-gm. -- Glen L. Beane Software Engineer The Jackson Laboratory Phone (207) 288-6153 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.scyld.com/pipermail/beowulf/attachments/20091215/0bb7b89a/attachment.html
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