[torqueusers] qsub -l size=## ?

Troy Baer tbaer at utk.edu
Fri Nov 14 17:06:01 MST 2008

On Fri, 2008-11-14 at 18:11 -0500, Brock Palen wrote:
> I was reading the jaguar docs page:
> http://www.nccs.gov/computing-resources/jaguar/quad-core-changes/
> They mention they are using torque and Moab (congrats to the project  
> and CR)
> That being said, what does -l size=## mean?

It's the total number of processor cores requested by the job.  That's
how it's used on Jaguar and Kraken (the NICS XT system), anyway.

TORQUE on the Cray XTs is a little weird in that you don't run a pbs_mom
on every compute node, because there are potentially tens of thousands
of them.  Instead, the pbs_moms run on some service nodes, and jobs on
those service nodes spawn processes on the compute nodes by calling out
to a Cray-specific placement service called ALPS (which in some ways is
like SLURM, if you're familiar with that).

Troy Baer, HPC System Administrator
National Institute for Computational Sciences, University of Tennessee
Phone:  865-241-4233

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