I found a great mini script <https://serverfault.com/a/792264/359447> to disable hyperthreading without reboot. I did get the following warning but
Offlining half the hyperthreads is not the same thing as disabling HT. HT is a fundamental mode of the CPU, and enabling it will statically partition some hardware resources in the core.
Side question, are there ways with Slurm to test if hyperthreading improves performance and job speed?
That's entirely application-specific. Remember that HT doesn't give you any additional resources: it just lets you fill pipeline bubbles.
(So only helps when the workload doesn't keep all resources busy.) regards, mark hahn.
