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Re: [Xen-devel] compute performace problem
| To: | David Becker <becker@xxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] compute performace problem |
| From: | Steven Hand <Steven.Hand@xxxxxxxxxxxx> |
| Date: | Sat, 23 Apr 2005 16:06:41 +0100 |
| Cc: | xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Steven.Hand@xxxxxxxxxxxx |
| Delivery-date: | Sat, 23 Apr 2005 15:06:27 +0000 |
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| In-reply-to: | Message from David Becker <becker@xxxxxxxxxxx> of "Sat, 23 Apr 2005 10:52:07 EDT." <20050423145207.GB4688@xxxxxxxxxxx> |
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>One of my users discovered large deviations in execution time for his >mpi jobs on xenUs. I can reproduce the problem running his job on >a single VM. On a native linux box the job completes in 64 secs +/- >a second or so. On a xenU, it completes somewhere between 64 and 250 >secs. This is true on 2.0.5 (2.6.10-xenU) and 2.0-testing(2.6.11-xenU). >I tried xen-unstable but it seemed any task was taking 4 times as >long as on 2.0 so I guess its still too unstable. > >Any suggestions I can try? Can you repeat the experiment using the round robin scheduler in Xen (i.e. boot with xen option "sched=rrobin")? cheers, S. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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