[slurm-dev] configuring slurm nodes to use less than the total number of processes on a machine

[Tom G]

Hi,

I have some slurm nodes with 8 core processors and hyperthreading, so 16
CPUs in effect.  I'd like to restrict slurm to only use 12 CPUs on this
machine.  What are the right slurm.conf settings to do this?

Doing 8 or 16 CPUs seems straightforward since i can set CoresPerSocket=8 +
ThreadsPerCore=1, or CoresPerSocket=8 + ThreadsPerCore=2 .  But if I want
to do 12, does that mean i do ThreadsPerCore=1.5 ?  Seems strange.

thanks in advance for any help.