Hi Brice, old dog still learning new tricks...
On Wed, 2021-12-22 at 17:40:17 +0100, Brice Goglin wrote: > > 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. > > > > Hello > > 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. Thanks for this interesting detail - I must have missed that shady corner of the settings ;) In a nutshell, this means that the configuration I will get is completely unpredictable - could be 2 x 32, 4 x 16 or 8 x 8 (Sockets x CoresPerSocket). So I have to wait, until I get my hands on either the BIOS or numactl or lscpu output. Thanks - case closed ;) Steffen -- 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 Mail: steffen.grunewald(at)aei.mpg.de ~~~
