[Beowulf] [External] head node abuse

Prentice Bisbal pbisbal at pppl.gov
Fri Mar 26 14:27:44 UTC 2021

Yes, there's a tool developed specifically for this called Arbiter that 
uses Linux cgroups to dynamically limit resources on a login node based 
on it's current load. It was developed at the University of Utah:




On 3/26/21 9:56 AM, Michael Di Domenico wrote:
> does anyone have a recipe for limiting the damage people can do on
> login nodes on rhel7.  i want to limit the allocatable cpu/mem per
> user to some low value.  that way if someone kicks off a program but
> forgets to 'srun' it first, they get bound to a single core and don't
> bump anyone else.
> i've been poking around the net, but i can't find a solution, i don't
> understand what's being recommended, and/or i'm implementing the
> suggestions wrong.  i haven't been able to get them working.  the most
> succinct answer i found is that per user cgroup controls have been
> implemented in systemd v239/240, but since rhel7 is still on v219
> that's not going to help.  i also found some wonkiness that runs a
> program after a user logs in and hacks at the cgroup files directly,
> but i couldn't get that to work.
> supposedly you can override the user-{UID}.slice unit file and jam in
> the cgroup restrictions, but I have hundreds of users clearly that's
> not maintainable
> i'm sure others have already been down this road.  any suggestions?
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