[torqueusers] Hogging Nodes

pat.o'bryant at exxonmobil.com pat.o'bryant at exxonmobil.com
Fri Mar 20 11:54:40 MDT 2009

     More more point. I would comment your use of  "JOBNODEMATCHPOLICY".
Just don't specify anything. The way it is coded implies only 1 job is
allowed on a node at a time and I don't think that is what you want.

J.W. (Pat) O'Bryant,Jr.
Business Line Infrastructure
Technical Systems, HPC

             <smm at rincon.co                                             To 
             m>                       "Gareth.Williams at csiro.au"           
             Sent by:                 <Gareth.Williams at csiro.au>           
             torqueusers-bo                                             cc 
             unces at superclu           "torqueusers at supercluster.org"       
             ster.org                 <torqueusers at supercluster.org>       
                                      RE: [torqueusers] Hogging Nodes      
             03/20/09 09:55                                                

There are a lot of great suggestions, but none seem to fit our situation
exactly.  Yes, we only want to affect the usage in question (a particular
program or two). In the general case we want all processors on all nodes to
be available.

The ppn=2 solution might be the best approach if we could write a little
bit of software to make half the jobs do nothing.

Thank you to everyone who replied.


-----Original Message-----
From: Gareth.Williams at csiro.au [mailto:Gareth.Williams at csiro.au]
Sent: Thursday, March 19, 2009 5:07 PM
To: Sarah Mulholland
Cc: torqueusers at supercluster.org
Subject: RE: [torqueusers] Hogging Nodes

> From: Prakash Velayutham [mailto:prakash.velayutham at cchmc.org]
> Sent: Friday, 20 March 2009 1:45 AM
> To: Sarah Mulholland
> Cc: torqueusers at supercluster.org
> Subject: Re: [torqueusers] Hogging Nodes
> May be
> will do?
> Prakash
> On Mar 18, 2009, at 7:47 PM, Sarah Mulholland wrote:
> I sent this question to the maui group over a week ago, but there was no
> answer.  Perhaps this question is more appropriate to the torque group.
> I am running the maui scheduler 3.2.6 patch level 16 with torque 2.1.6.
> am looking for a way to submit a job on some number of nodes, say 10.  In
> addition to running on 10 nodes, I want exclusive use of those nodes.  Is
> there a property I can set to allow that kind of scheduling?   So far I'm
> submitting jobs with
>             "-l nodes=10:ppn=1"
> Specifically I have a job that needs to run on 10 processors all on
> different nodes.  We have two processors per node.  The
> EXACTNODE makes sure our job gets what it needs, but I want to prevent
> anything else from running on the second processor of the 10 nodes.
> Is there a "don't-share-the-nodes" modifier that I can set on the job
> submission?  In the maui.cfg?

Hi Sarah,

You seem to have the solution now, but this will globally affect all jobs
and this may not be desirable if you have a mixed workload.  You could use
the softer approach of submitting the jobs in question with
"-l nodes=10:ppn=2" and then just only running 10 processes.  You may need
to customize your options used with mpi in this case, but it would only
affect the usage in question and not all users.


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