[slurm-users] How to turn off core specialization?

Guertin, David S. guertin at middlebury.edu
Fri Aug 9 19:41:26 UTC 2019

I was doing some testing with core specialization (https://slurm.schedmd.com/core_spec.html) before deciding that I don't want to have it enabled, so I'm trying to turn it off. The problem is that on most of the nodes in my cluster, I can't disable it.

I've removed the CoreSpecCount and CPUSpecList lines from slurm.conf. My slurm.conf file is shared via NFS to all the nodes in the cluster, so it should apply to all of them. But for the majority of my nodes, I still see one specialized core:

# scontrol show node node004
NodeName=node004 Arch=x86_64 CoresPerSocket=18
   CPUAlloc=0 CPUTot=36 CPULoad=0.18
   CoreSpecCount=1 CPUSpecList=35

But on a couple of nodes, CoreSpecCount is indeed gone:

# scontrol show node node003
NodeName=node003 Arch=x86_64 CoresPerSocket=18
   CPUAlloc=0 CPUTot=36 CPULoad=0.01
<snip -- no CoreSpecCount is shown>

How can I get rid of that specialized core? I'd like it back for jobs to use.


David Guertin
Information Technology Services
Middlebury College
700 Exchange St.
Middlebury, VT 05753
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