[Beowulf] Puzzling Intel mpi behavior with slurm

Michael Di Domenico mdidomenico4 at gmail.com
Thu Apr 5 10:59:44 PDT 2018

i'm pretty sure, but don't quote me, that slurm forks processes from
the slurmd to launch code and does not use ssh

On Thu, Apr 5, 2018 at 11:10 AM, Faraz Hussain <info at feacluster.com> wrote:
> Here's something quite baffling. I have a cluster running slurm but have not
> setup passwordless ssh for a user yet. So when the user runs "mpirun -n 2
> -hostfile hosts hostname", it will hang because of ssh issue. That is
> expected.
> Now the baffling thing is the mpirun command works inside a slurm script!
> How can it work if passwordless ssh has not been configured? Does slurm use
> some different authentication (munge?) to login to the hosts and execute the
> hostname command?
> Or does slurm have some fancy behind the scenes integration with Intel mpi ?
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