<div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Apr 23, 2020 at 1:43 PM Michael Robbert <<a href="mailto:mrobbert@mines.edu">mrobbert@mines.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang="EN-US"><div class="gmail-m_-2881967002056078239WordSection1"><p class="MsoNormal">It looks like you have hyper-threading turned on, but haven’t defined the ThreadsPerCore=2. You either need to turn off Hyper-threading in the BIOS or changed the definition of ThreadsPerCore in slurm.conf.</p></div></div></blockquote><div><br></div><div>Nice find. node003 has hyper threading enabled but node001 and node002 do not:</div><div><font face="monospace">[root@node001 ~]# dmidecode -t processor | grep -E '(Core Count|Thread Count)'<br> Core Count: 12<br> Thread Count: 12<br> Core Count: 12<br> Thread Count: 12<br><br>[root@node003 ~]# dmidecode -t processor | grep -E '(Core Count|Thread Count)'<br> Core Count: 12<br> Thread Count: 24<br> Core Count: 12</font><br></div><div>I <a href="https://serverfault.com/a/792264/359447">found a great mini script</a> to disable hyperthreading without reboot. I did get the following warning but I don't think it's a big issue:</div><div><font face="monospace"> WARNING, didn't collect load info for all cpus, balancing is broken</font><br></div><div><br></div><div>Do I have to restart slurmctl on the head node and/or slurmd on node003?</div><div><br></div><div>Side question, are there ways with Slurm to test if hyperthreading improves performance and job speed?</div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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