[slurm-users] Only one socket for SLURM
chris at csamuel.org
Fri Feb 22 05:47:21 UTC 2019
On Thursday, 21 February 2019 1:00:52 PM PST Sam Hawarden wrote:
> Linux assigns numbers to your CPUs. 0-15 will be socket 1, thread 1. 16-31
> are socket 2, thread 1, 32-47 are socket 1, thread 2. 48-63 are socket 2,
> thread 2.
This isn't strictly true, for x86 for instance the kernel will read firmware
tables to discover how the vendor has assigned the core numbering.
This means it can vary from vendor to vendor and model to model plus it can
potentially change on a firmware upgrade, just to make life even more
This is why hwloc (and its predecessors) exist, to give a sane interface and
default logical layout. Slurm uses a similar system that results in something
that looks very similar, so to Slurm CPU 0 is socket 1, core 1, thread 1 and
CPU 2 is socket 1, core 1, thread 2, etc...
All the best,
Chris Samuel : http://www.csamuel.org/ : Berkeley, CA, USA
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