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<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Well, reading the source it looks like xcgroup_set_params is just writing to the devices.allow and devices.deny files. I haven’t yet found what cg->path is being set to but presumably it is too /sys/fs/cgroup/slurm/uid_######/job_#########/step_0
or equivalent for the job in question.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I’m still not sure why “cgget –a /slurm/uid_######/job_#########/step_0” shows reasonable values for cores and memory but not the device.list entry.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">If anyone has any insight on how I can see and reproduce the cgroups device setup of a slurm job by hand it would be appreciated.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b> slurm-users <slurm-users-bounces@lists.schedmd.com>
<b>On Behalf Of </b>Ransom, Geoffrey M.<br>
<b>Sent:</b> Thursday, March 4, 2021 4:20 PM<br>
<b>To:</b> Slurm User Community List <slurm-users@lists.schedmd.com><br>
<b>Subject:</b> [EXT] Alert-Verify-Sender: [slurm-users] slurm and device cgroups<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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</span></b><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:black">Verify sender
<a href="mailto:slurm-users-bounces@lists.schedmd.com">slurm-users-bounces@lists.schedmd.com</a> before clicking links or attachments</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
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<p> <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hello<o:p></o:p></p>
<p class="MsoNormal"> I am trying to debug an issue with EGL support (updated NVIDIA drivers and now EGLGetDisplay and EGLQueryDevicesExt are failing if they can’t access all /dev/nvidia# devices in slurm) and am wondering how slurm uses device cgroups so
I can implement the same cgroup setup by hand and test our issue outside of slurm.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We have slurm 20.02.05 with cgroups set up with Cores, RAMSpace, and devices being constrained.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">When I get onto an allocation with 1 of 4 GPUs on the system nvidia-smi only sees the GPU I was assigned and I get permission denied when I try to access the other /dev/nvidia# devices.<o:p></o:p></p>
<p class="MsoNormal">When I look at the cgroup either through the /sys/fs/cgroups/slurm/uid_######/job_#########/step_0 or with the cgget command I see the values for memory.limit_in_bytes and cpuset.cpus being set as expected, but the devices.list value is
set to “a *:* rwm” even though I am being blocked from other devices. The device restriction does seem to working but the cgroup parameters for it are not set as I would expect to see.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">How does slurm manage the device cgroup settings on RHEL 7 so I can check and mimic them?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks.<o:p></o:p></p>
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