Hi Stephen, "Stephen Berg, Code 7309" <stephen.b...@nrlssc.navy.mil> writes:
> I'm currently testing a new slurm setup before converting an existing > pbs/torque grid over. Right now I've got 8 nodes in one partition, 48 > cores on each. There's a second partition of older systems configured > as 4 core nodes so the users can run some serial jobs. > > During some testing I've noticed that jobs always seem to take the > nodes in a top down fashion. If I queue up a bunch of 3 node jobs > they take nodes 1, 2 and 3 for one job, 4,5 and 6 for another. Nodes 7 > and 8 never get used. I'd like to have slurm spread the jobs out > across the nodes in a round robin fashion or even randomly. My config > is really basic right now, I'm using defaults for most everything. > > Which settings could get the jobs spread out across the nodes in each > partition a bit more fairly? You can set LLN for "least loaded nodes" in the configuration of the partition (see 'man slurm.conf') However, this is often not what you want. If you maximise the number of nodes in use, you won't be able to save energy by powering down nodes which are not required. What is your use-case for wanting to spread the jobs out? Cheers, Loris -- Dr. Loris Bennett (Herr/Mr) ZEDAT, Freie Universität Berlin
