[torqueusers] qsub -l size=## ?

[Troy Baer]

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
-- 
Troy Baer, HPC System Administrator
National Institute for Computational Sciences, University of Tennessee
http://www.nics.tennessee.edu/
Phone:  865-241-4233