[Beowulf] numad?

Ryan Novosielski novosirj at rutgers.edu
Tue Jan 18 20:10:44 UTC 2022

It’s not installed on our nodes, so nothing to turn off.

|| \\UTGERS,  	 |---------------------------*O*---------------------------
||_// the State	 |         Ryan Novosielski - novosirj at rutgers.edu
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||  \\    of NJ	 | Office of Advanced Research Computing - MSB C630, Newark

> On Jan 18, 2022, at 1:18 PM, Michael Di Domenico <mdidomenico4 at gmail.com> wrote:
> does anyone turn-on/off numad on their clusters?  I'm running RHEL7.9
> on Intel CPU's and seeing a heavy performance impact on MPI jobs when
> running numad.
> diagnosis is pretty prelim right now, so i'm light on details.  when
> running numad i'm seeing MPI jobs stall while numad pokes at the job.
> the stall is notable, like 10-12 seconds
> it's particularly interesting because if one rank stalls while numad
> runs, the others wait.  once it frees they all continue, but then
> another rank gets hit, so i end up seeing this cyclic stall
> like i said i'm still looking into things, but i curious what
> everyone's take on numa is.  my consensus is we probably don't even
> really need it since slurm/openmpi should be handling process
> placement anyhow
> thoughts?
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