[slurm-users] slurm node weights

[Marcus Boden]

Hello Doug,

tp quote the slurm.conf page:
It would be preferable to allocate smaller memory nodes rather than
larger memory nodes if either will satisfy a job's requirements.

So I guess the idea is, that if a smaller node satisfies all
requirements, why 'waste' a bigger one for it? It makes sense for
memory, though I agree that it is counterintuitive for preocessors.

Best,
Marcus

On 19-09-05 15:48, Douglas Duckworth wrote:
> Hello
> 
> We added some newer Epyc nodes, with NVMe scratch, to our cluster and so want jobs to run on these over others.  So we added "Weight=100" to the older nodes and left the new ones blank.  So indeed, ceteris paribus, srun reveals that the faster nodes will accept jobs over older ones.
> 
> We have the desired outcome though I am a bit confused by two statements in the manpage<https://slurm.schedmd.com/slurm.conf.html> that seem to be contradictory:
> 
> "All things being equal, jobs will be allocated the nodes with the lowest weight which satisfies their requirements."
> 
> "...larger weights should be assigned to nodes with more processors, memory, disk space, higher processor speed, etc."
> 
> 100 is larger than 1 and we do see jobs preferring the new nodes which have the default weight of 1.  Yet we're also told to assign larger weights to faster nodes?
> 
> Thanks!
> Doug
> 
> 
> --
> Thanks,
> 
> Douglas Duckworth, MSc, LFCS
> HPC System Administrator
> Scientific Computing Unit<https://scu.med.cornell.edu/>
> Weill Cornell Medicine"
> E: doug at med.cornell.edu
> O: 212-746-6305
> F: 212-746-8690

-- 
Marcus Vincent Boden, M.Sc.
Arbeitsgruppe eScience
Tel.:   +49 (0)551 201-2191
E-Mail: mboden at gwdg.de
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