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Subject: Re: [OMPI users] seg fault with intel compiler
From: Gus Correa (gus_at_[hidden])
Date: 2012-06-01 17:29:54

On 06/01/2012 05:06 PM, Edmund Sumbar wrote:
> Thanks for the tips Gus. I'll definitely try some of these, particularly
> the nodes:ppn syntax, and report back.

You can check for torque support with

mpicc --showme

It should show among other things -ltorque [if it
has torque support] and -lrdmacm -libverbs [if it
has OpenIB/Infinband support].

If Torque is not installed in a standard location
[such as /usr or /usr/local],
which is often the case, you may need
to point configure to the Torque library with:


Likewise for Infinband/OpenIB if you have it:


[I am citing these options from memory.
Do a './configure -help' to check the right syntax, please.]

Making a log file of your configure run may be helpful, to
diagnose problems.

Finally, if I remember right, there was some problem
reported in the list regarding Intel compilers 12.1.
[I built 1.4.5 with Intel 11 and it works fine.]
However, that problem may have been superseded in
the latest OpenMPI 1.6.0.
[The release notes will tell, or perhaps Jeff.]

I hope this helps,
Gus Correa

> 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]
> <mailto: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.
> 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
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