Re: [slurm-users] Node specs for Epyc 7xx3 processors?

[Brice Goglin]

Le 22/12/2021 à 17:27, Steffen Grunewald a écrit :

On Wed, 2021-12-22 at 16:02:00 +0000, Stuart MacLachlan wrote:

Hi Steffan,

Not sure if the output from 'numactl --hardware' is more consistent and easier 
to parse with a script or similar?

Hi,

I'm getting confusing results.
For an older dual 7351, there are 8 NUMA nodes, 4 physical cores each.
  (This already works with Slurm "Sockes=8 CorePerSocket=4".)
For a dual 7713 running Ubuntu, kernel 5.11, I get 2 NUMA nodes, one
per processor (64 physical cores, times 2).
I've seen "lscpu" output for a 7313 which also shows 8 nodes, 4 cores,
2 threads each, kernel 4.19, Debian Buster.
Does Ubuntu (or the 5.11 kernel) handle NUMA nodes difefrently?

Hello





Brice

AMD Epyc can be configured with 1, 2 or 4 NPS (nodes per socket) in the BIOS. Your old 7351 is configured in NPS4, your dual 7713 is NPS1, and 7313 is NPS4 again.

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