[slurm-users] unable to run on all the logical cores

[Chris Samuel]

On 10/7/20 10:13 pm, David Bellot wrote:

> NodeName=foobar01 CPUs=80 Boards=1 SocketsPerBoard=2 CoresPerSocket=20 
> ThreadsPerCore=2 RealMemory=257243 State=UNKNOWN

With this configuration Slurm is allocation a single physical core (with 
2 thread units) per task. So you are using all (physical) cores.

However, if what you want is to have 1 process per thread unit (not 
necessarily a good idea, depending on how your code works) then I think 
you'd need to adjust your config to lie to Slurm and tell it it's got 40 
cores per socket and 1 thread per core instead.

All the best,
Chris
-- 
Chris Samuel  :  http://www.csamuel.org/  :  Berkeley, CA, USA