[Beowulf] Puzzling Intel mpi behavior with slurm

[Michael Di Domenico]

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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