[Beowulf] Performance degrading

Glen Beane Glen.Beane at jax.org
Tue Dec 15 15:10:47 EST 2009




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.clustermonkey.net/pipermail/beowulf/attachments/20091215/0bb7b89a/attachment-0001.html>
-------------- next part --------------
_______________________________________________
Beowulf mailing list, Beowulf at beowulf.org sponsored by Penguin Computing
To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf


More information about the Beowulf mailing list