[torqueusers] Exclusive Nodes

Piotr Siwczak psiwczak at man.poznan.pl
Thu Sep 15 08:56:51 MDT 2005

IMHO, this could work only if the software he uses is single-threaded. 
What if you want to prevent it from forking to the second CPU?

  Piotr Siwczak <psiwczak at man.poznan.pl>
  System Administrator

  Poznan Supercomputing and Networking Center
  Supercomputing Department

  (www.eu-egee.org <piotr.siwczak at cern.ch>)

On Thu, 15 Sep 2005, Michael Barnes wrote:

> On Thu, Sep 15, 2005 at 08:30:09AM -0500, Clifton Kirby wrote:
>> On page 4 of the PBS administrators guide there is mention of
>> "Exclusive Nodes".  How would you define them in the server nodes
>> file?  I have a situation where my user only wants one CPU from a
>> dual CPU system but wants exclusive access to the system to avoid a
>> second job running on the system since one CPU is still available from
>> PBS.  The PBS directive is "nodes=2:ppn=1" and he does not want two
>> processes on the machine as in "nodes=2:ppn=2".  Is there a mechanism
>> for qsub or a PBS directive to allow for what he is doing or can I
>> simply define the nodes as "Exclusive"?
> If you use the Maui scheduler, you can create a user reservation on a
> set of nodes and the user can use those nodes as he/she sees fit.
> Another thing I tell my users such as the case where they need more node
> resources like over 1/2 of the memory or disk is to simply use ppn=2 and
> just use one processor when the job runs.  That will keep other jobs off
> of the node.
> Mike
> -- 
> /-----------------------------------------\
> | Michael Barnes <mbarnes at compsci.wm.edu> |
> | UNIX Systems Administrator              |
> | College of William and Mary             |
> | Phone: (757) 879-3930 (cell)            |
> \-----------------------------------------/
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