[Beowulf] Puzzling Intel mpi behavior with slurm

[Skylar Thompson]

At least for Grid Engine/OpenMPI the preferred mechanism ("tight
integration") involves the shepherds running on each exec hosts to start
MPI, without any SSH/RSH required at all. I'm not sure if you've run across
this documentation, but it might help to figure out what's going on:

https://slurm.schedmd.com/mpi_guide.html#intel_mpi

I'm guessing you're using the "srun" method right now.

Skylar

On Thu, Apr 5, 2018 at 8:10 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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