[slurm-users] Node specs for Epyc 7xx3 processors?
steffen.grunewald at aei.mpg.de
Wed Dec 22 16:27:49 UTC 2021
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?
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?
> I'm wondering whether there is some rule-of-thumb to translate the core config listed in https://urldefense.proofpoint.com/v2/url?u=https-3A__en.wikipedia.org_wiki_Epyc&d=DwIDAw&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=WRHOCjWNhD-hk2AQTjbVUqX9gELcVS7wxFXQqbJ02hk&m=tinTJJMaVo42Y9_sd_6GFqebHHPSHkAU7HWSxq9pJJk&s=4qtrnAVSz-nrQqws1E9H4JixtZQpj0dg3dtPszJpW1g&e= to the node information Slurm expects in "Sockets=x CoresPerSocket=y"? ("ThreadsPerCore=2" is clear.)
> We'll be getting Epyc 7313 and 7513 machines, and perhaps add a single 7713 one - "lscpu" outputs are wildly different, while the total number of cores is correct.
> Will I have to wait until the machines have arrived, and do some experiments, or did someone already retrieve the right numbers, and is willing to share?
Steffen Grunewald, Cluster Administrator
Max Planck Institute for Gravitational Physics (Albert Einstein Institute)
Am Mühlenberg 1 * D-14476 Potsdam-Golm * Germany
Fon: +49-331-567 7274
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