[slurm-users] Transparently assign different walltime limit to a group of nodes ?

[Loris Bennett]

Hi Jens,

Jens Dreger <jens.dreger at physik.fu-berlin.de> writes:

> Hi everyone!
>
> Is it possible to transparently assign different walltime limits
> to nodes without forcing users to specify partitions when submitting
> jobs?
>
> Example: let's say I have 10 nodes. Nodes n01-n05 should be available
> for jobs with a walltime up to 14 days, while n06-n10 should only
> be used for jobs with a walltime limit less then 1 day. Then as long
> as nodes n06-n10 have free resources, jobs with walltime <1day should
> be scheduled to these nodes. If n06-n10 are full, jobs with walltime
> <1day should start on n01-n05. Users should not have to specify
> partitions.
>
> Would this even be possible to do with just one partition much
> like nodes with different memory size using weights to fill nodes
> with less memoery first?
>
> Background of this question is that it would be helpfull to be able
> to lower the walltime for a rack of nodes, e.g. when adding this rack
> to an existing cluster in order to be able to easily shut down just
> this rack after one day in case of instabilities. Much like adding
> N nodes to a cluster without changing anything else and have only
> jobs with walltime <1day on thiese nodes in the beginning.

If you just want to reduce the allowed wall-time for a given rack, can't
you just use a maintenance reservation for the appropriate set of nodes?

Cheers,

Loris

-- 
Dr. Loris Bennett (Mr.)
ZEDAT, Freie Universität Berlin         Email loris.bennett at fu-berlin.de