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From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2006-02-14 15:05:48

On Feb 14, 2006, at 2:08 PM, Mike Haskell wrote:

> odev2_at_mhaskell: srun -N4 -n4 --nodelist=odev[0-3,6] `pwd`/hello
> 1 of 4: Hello world!
> 3 of 4: Hello world!
> 2 of 4: Hello world!
> 0 of 4: Hello world!
> When I run it with OpenMPI (openmpi-1.0.2a4), I get:
> odev2_at_mhaskell: srun -N4 -n4 --nodelist=odev[0-3,6] `pwd`/hello
> 0 of 1: Hello world!
> 0 of 1: Hello world!
> 0 of 1: Hello world!
> 0 of 1: Hello world!

This is actually not a mode that we support in SLURM [yet] -- we
currently require the use of mpirun. For example:

        srun -N4 -n4 -A ...
        mpirun -np 4 hello

The "-A" option to srun will give you an interactive shell where you
can run mpirun as many times as you'd like. The mpirun will
automatically get the hostnames from SLURM -- no need to provide a
hostfile or anything like that.

Similarly, you can write a script and submit it to slurm with the -b
switch (where only one copy of the script runs, not N copies). You'd
put the mpirun command in there, and just like with the interactive
mode, it'll get the hosts from SLURM, etc.

(FWIW, we use SLURM on our clusters too -- these two modes have
worked quite well for us; let us know if you have problems with them)

Hope that helps!

{+} Jeff Squyres
{+} The Open MPI Project