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: d...@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: mbo...@gwdg.de --------------------------------------- Gesellschaft fuer wissenschaftliche Datenverarbeitung mbH Goettingen (GWDG) Am Fassberg 11, 37077 Goettingen URL: http://www.gwdg.de E-Mail: g...@gwdg.de Tel.: +49 (0)551 201-1510 Fax: +49 (0)551 201-2150 Geschaeftsfuehrer: Prof. Dr. Ramin Yahyapour Aufsichtsratsvorsitzender: Prof. Dr. Christian Griesinger Sitz der Gesellschaft: Goettingen Registergericht: Goettingen Handelsregister-Nr. B 598 ---------------------------------------
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