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Thank you Chris, Marcus, Patrick and Ray.
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<div class="">I guess i am still a bit confused. We will se what happen when we run a job asking for the CPU’s of the cluster.</div>
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<div class="">On May 7, 2018, at 4:08 AM, Chris Samuel <<a href="mailto:chris@csamuel.org" class="">chris@csamuel.org</a>> wrote:</div>
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<div class="">On Monday, 7 May 2018 5:41:27 PM AEST Marcus Wagner wrote:<br class="">
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<blockquote type="cite" class="">To me it looks like CPUs is the synonym for hardware threads.<br class="">
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Interesting, at ${JOB-1} we experimented with HT on a system back in 2013 and <br class="">
I didn't do the slurm.conf side at that time, but then you could only request <br class="">
physical cores and you would be allocated both thread units (unless you lied <br class="">
to Slurm and listed them as physical cores instead).<br class="">
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Everything I've ever done since has had ThreadsPerCore=1, until today where we <br class="">
have some KNL nodes which are ThreadsPerCore=4. <br class="">
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I can confirm there that you get 4 hardware thread units (a single core) when <br class="">
you request -n 1 -c 1 - here from an interactive job on a KNL node:<br class="">
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[csamuel@gina1 ~]$ cat /sys/fs/cgroup/cpuset/$(cat /proc/$$/cpuset)/<br class="">
cpuset.cpus<br class="">
0,68,136,204<br class="">
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So in the sense of what you put in slurm.conf you are indeed right, <br class="">
CPUs=boards*sockets*cores*threads, but from the point of view of what you <br class="">
*request* CPUs are just boards*sockets*cores.<br class="">
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Confusing!<br class="">
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All the best,<br class="">
Chris<br class="">
-- <br class="">
Chris Samuel : <a href="http://www.csamuel.org/" class="">http://www.csamuel.org/</a> : Melbourne, VIC<br class="">
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