I believe in absence of other reasons, slurm assigns nodes to jobs in the order they are listed in the partition definitions of slurm.conf -- perhaps for whatever reason the node 41 appears first there, rather than 01?
On Thu, Jan 9, 2025 at 7:24 AM Dan Healy via slurm-users < slurm-users@lists.schedmd.com> wrote: > No, sadly there’s no topology.conf in use. > > Thanks, > > Daniel Healy > > > On Thu, Jan 9, 2025 at 8:28 AM Steffen Grunewald < > steffen.grunew...@aei.mpg.de> wrote: > >> On Thu, 2025-01-09 at 07:51:40 -0500, Slurm users wrote: >> > Hello there and good morning from Baltimore. >> > >> > I have a small cluster with 100 nodes. When the cluster is completely >> empty >> > of all jobs, the first job gets allocated to node 41. In other clusters, >> > the first job gets allocated to mode 01. If I specify node 01, the >> > allocation works perfectly. I have my partition NodeName set as >> > node[01-99], so having node41 used first is a surprise to me. We also >> have >> > many other partitions which start with node41, but the partition being >> used >> > for the allocation starts with node01. >> > >> > Does anyone know what would cause this? >> >> Just a wild guess, but do you have a topology.conf file that somehow makes >> this node look most reasonable to use for a single-node job? >> (Topology attempts to assign, or hold back, sections of your network to >> maximize interconnect bandwidth for multi-node jobs. Your node41 might be >> one - or the first one of a series - that would leave bigger chunks unused >> for bigger tasks.) >> >> HTH, >> Steffen >> >> -- >> Steffen Grunewald, Cluster Administrator >> Max Planck Institute for Gravitational Physics (Albert Einstein Institute) >> Am Mühlenberg 1 * D-14476 Potsdam-Golm * Germany >> ~~~ >> Fon: +49-331-567 7274 >> Mail: steffen.grunewald(at)aei.mpg.de >> ~~~ >> > > -- > slurm-users mailing list -- slurm-users@lists.schedmd.com > To unsubscribe send an email to slurm-users-le...@lists.schedmd.com >
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