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Re: [Xen-users] How can you tell if NUMA is turned on in the Hypervisor?

  • To: "Jeff Lane" <sundowner225@xxxxxxxxx>
  • From: "Todd Deshane" <deshantm@xxxxxxxxx>
  • Date: Thu, 1 May 2008 10:54:08 -0400
  • Cc: xen-users@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Thu, 01 May 2008 08:49:01 -0700
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Hi Jeff,

On Thu, May 1, 2008 at 9:59 AM, Jeff Lane <sundowner225@xxxxxxxxx> wrote:
> On Wed, Apr 30, 2008 at 6:21 PM, Todd Deshane <deshantm@xxxxxxxxx> wrote:
>  >  Try xm info | grep nr_nodes
>  >
>  >  nr_nodes > 1 implies NUMA
>  >  nr_nodes == 1 imples not NUMA
>  Thanks Todd!
>  One other question though...  does that apply equally to multi-noded
>  systems like the IBM x3950?

I can't tell from a quick look at the specs whether it is NUMA or not.

Can you (or someone) try running the xm info command it?
Or does somebody know if these multi-node IBM systems are NUMA or not?

  I have a few of those used for test... a
>  couple are 2 node machines, while one is an 8 node.  That's the
>  biggest reason for needing NUMA, as anything (Xen or not) running on
>  multi-noded systems runs better with NUMA :-)

Have you done any benchmarking that shows this? Any papers or
references that confirm it?


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