[slurm-users] Problem with cgroup plugin in Ubuntu22.04 and slurm 21.08.5
Angel de Vicente
angel.de.vicente at iac.es
Sat Apr 22 10:46:47 UTC 2023
Angel de Vicente <angel.de.vicente at iac.es> writes:
> Do you know how I could fix this while keeping the cgroup plugin? My
> intuition tells me that I should probably get the latest version of
> Slurm and compile it myself, but I thought I would ask here before going
> that route.
I followed my intuition and got much closer to fixing it.
So far I learned the following:
+ the older Slurm seems to only support cgroup v1
+ Ubuntu 18.04 seems to be in a "Hybrid" cgroup mode
+ Ubuntu 22.04 is in "V2" mode:
So, I compiled in Ubuntu 22.04 a newer Slurm version (22.05.8), which
has support for both cgroup v1 and v2.
But when starting this version, slurmd complains with:
| slurmd: fatal: Hybrid mode is not supported. Mounted cgroups are:
If I unmount /cgroup/freezer and /cgroup/cpuacct then all works fine
with Slurm, but I'm not sure where/who is mounting these, and whether it
is safe to unmount them. These machines were being upgraded from 18.04,
so not sure if these are leftovers from that version or a completely new
22.04 installation would also have these.
Ángel de Vicente
Research Software Engineer (Supercomputing and BigData)
Tel.: +34 922-605-747
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