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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