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Subject: Re: [OMPI users] seg fault with intel compiler
From: Edmund Sumbar (esumbar_at_[hidden])
Date: 2012-06-01 17:06:10


Thanks for the tips Gus. I'll definitely try some of these, particularly
the nodes:ppn syntax, and report back.

Right now, I'm upgrading the Intel Compilers and rebuilding Open MPI.

On Fri, Jun 1, 2012 at 2:39 PM, Gus Correa <gus_at_[hidden]> wrote:

> The [Torque/PBS] syntax '-l procs=48' is somewhat troublesome,
> and may not be understood by the scheduler [It doesn't
> work correctly with Maui, which is what we have here. I read
> people saying it works with pbs_sched and with Moab,
> but that's hearsay.]
> This issue comes back very often in the Torque mailing
> list.
>
> Have you tried instead this alternate syntax?
>
> '-l nodes=2:ppn=24'
>
> [I am assuming here that your
> nodes have 24 cores, i.e. 24 'ppn', each]
>
> Then in the script:
> mpiexec -np 48 ./your_program
>
>
> Also, in your PBS script you could print
> the contents of PBS_NODEFILE.
>
> cat $PBS_NODEFILE
>
>
> A simple troubleshooting test is to launch 'hostname'
> with mpirun
>
> mpirun -np 48 hostname
>
> Finally, are you sure that the OpenMPI you are using was
> compiled with Torque support?
> If not, I wonder if clauses like '-bynode' would work at all.
> Jeff may correct me if I am wrong, but if your
> OpenMPI lacks Torque support,
> you may need to pass to mpirun
> the $PBS_NODEFILE as your hostfile.
>

-- 
Edmund Sumbar
University of Alberta
+1 780 492 9360