[slurm-users] Warning: can't honor --ntasks-per-node

[Ginés Guerrero]

Hi Bjørn,

Thank you very much for your help. That's right, we use IntelMPI.

At the moment, we are telling users to ignore the warning. But we
think it's a Slurm bug, so we've reported it, in case the developers
want to take a look at it.

Regards,

Ginés

El mié, 17 nov 2021 a las 5:13, Bjørn-Helge Mevik
(<b.h.mevik at usit.uio.no>) escribió:
>
> Ginés Guerrero <gguerrero at nlhpc.cl> writes:
>
> > Hi,
> >
> > If I submit this script:
> >
> >     #!/bin/bash
> >     #SBATCH --get-user-env
> >     #SBATCH -p slims
> >     #SBATCH -N 2
> >     #SBATCH -n 40
> >     #SBATCH --ntasks-per-node=20
> >     #SBATCH -o log
> >     #SBATCH -e log
> >
> >     /bin/env
> >
> >     srun hostname
> >
> > I get the warning: “can't honor --ntasks-per-node set to 20 which
> > doesn't match the requested tasks 40 with the number of requested
> > nodes 1. Ignoring –ntasks-per-node”.
>
> Are you using IntelMPI?  I've seen this type of warning in some
> situations with IntelMPI.  In all our cases, "srun hostname" or "mpirun
> hostname" shows that it *does* honor --ntasks-per-node.  (So we
> generally just ask our users to check with "srun hostname", and ignore
> the warning if it works as expected.)
>
> --
> Regards,
> Bjørn-Helge Mevik, dr. scient,
> Department for Research Computing, University of Oslo
>