[slurm-users] Cgroups and swap with 18.08.1?

[Bill Broadley]

On 10/16/18 3:38 AM, Bjørn-Helge Mevik wrote:
> Just a tip: Make sure that the kernel has support for constraining swap
> space.  I believe we once had to reinstall one of our clusters once
> because we had forgotten to check that.

I tried starting slurmd with -D -v -v -v and got:

slurmd: debug:  Reading cgroup.conf file
/share/apps/slurm-18.08.1/16.04/etc/cgroup.conf
slurmd: debug:  Reading cgroup.conf file
/share/apps/slurm-18.08.1/16.04/etc/cgroup.conf
slurmd: debug:  task/cgroup: now constraining jobs allocated cores
slurmd: debug:  task/cgroup/memory: total:64388M allowed:100%(enforced),
swap:0%(enforced), max:100%(64388M) max+swap:0%(64388M) min:30M kmem:100%(64388M
permissive) min:30M swappiness:0(set)
slurmd: debug:  task/cgroup: now constraining jobs allocated memory
slurmd: debug:  task/cgroup: unable to open
/share/apps/slurm-18.08.1/16.04/etc/cgroup_allowed_devices_file.conf: No such
file or directory
slurmd: debug:  task/cgroup: now constraining jobs allocated devices
slurmd: debug:  task/cgroup: loaded

Looks pretty promising.  Has anyone out there managed to get constrained swap
working?