[torqueusers] -l arch default

Steve Young chemadm at hamilton.edu
Tue Dec 16 10:11:35 MST 2008

	I set the ARCH and OPSYS variables in the mom config file on each node:


opsys RHEL4
arch Linux-X86_64

Then if needed a user can request nodes based on these variables...  
#PBS -l arch=Linux-x86_64 or #PBS -l opsys=RHEL4. Seems to work well  
to allow me to separate the different types of architectures if needed.

Hope this helps,


On Dec 16, 2008, at 11:53 AM, Gabe Turner wrote:

> On Mon, Dec 15, 2008 at 12:25:21PM -0500, Paul Buerger wrote:
>> We are using Torque 2.1.8 and Moab 5.2.3.
>> The way I read the Torque documentation, the PBS resource arch  
>> 'defaults
>> to whatever the PBS_MACH string is set to in "local.mk"'.  On our  
>> system
>> PBS_MACH is set to "linux".  The Moab configuration also has  
>> "linux" as
>> the arch for those compute nodes for which arch is not otherwise
>> specified.  From all this I expect the following two commands to  
>> result
>> in the same sort of scheduling.
>>     qsub -joe -l arch=linux
>>     qsub -joe
>> Alas, this does not seem to be the case.  The first command results  
>> in
>> the job being consistently scheduled on nodes that Moab has  
>> configured
>> (by default) to "linux".  The second command results in the job being
>> scheduled willy-nilly on nodes that Moab has configured either as  
>> "linux"
>> or as something else.
> Although the default arch is set to PBS_MACH, if you don't tell  
> Torque to
> _use_ arch in some way (either with -l arch as you've done above, or  
> with a
> server or queue setting via qmgr), specific jobs will by default  
> have no
> arch set at all.
> HTH,
> Gabe
> -- 
> Gabe Turner                                             gabe at msi.umn.edu
> UNIX System Administrator,
> University of Minnesota
> Supercomputing Institute                          http://www.msi.umn.edu
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