In addition to a QOS, an advanced reservation may also satisfy your needs:
http://slurm.schedmd.com/reservations.html
Quoting Ryan Cox <[email protected]>:
George,
Wouldn't a QOS with GrpNodes=10 accomplish that?
Ryan
On 10/30/2014 11:47 AM, Brown George Andrew wrote:
Hi,
I would like to have a partition of N nodes without statically
defining which nodes should belong to a partition and I'm trying to
work out the best way to achieve this.
Currently I have partitions which span across all the nodes in my
cluster with differing settings, but I would like some of these to
only occupy a subset of the cluster. I could say define partition A
which can use all nodes but partition B may only access nodes
01-10. But I would like avoid partition B being reduced in size in
the event of maintenance or hardware failure.
I'm thinking the way to do this would be via a plugin. I would keep
all partitions spanning all nodes in the cluster but upon
submission check how many nodes are in use on the requested
partition. If there were say already 10 nodes in use in partition B
the job should be queued. However things then get a bit more
complex as to when slurm should de-queue and then run the job.
Is there a native method to do this in slurm? Essentially I would
like something like the MaxNodes option that exists for partitions
today but have it limit the total number of nodes used by jobs
submitted to that partition rather than just a limit per job.
Many thanks,
George
--
Morris "Moe" Jette
CTO, SchedMD LLC
