[Beowulf] Torque Error: multi-req PBS jobs not allowed

Greg Lindahl lindahl at pbm.com
Mon Apr 20 18:11:52 EDT 2009

On Mon, Apr 20, 2009 at 04:59:31PM -0500, Rahul Nabar wrote:

> Why would PBS-Torque not allow this and my previous threads
> "JOBNODEMATCHPOLICY EXACTNODE" by default? Are there any reasons not
> to use them? The compromise is not obvious to me.

In general it's most efficient to have a job use whole nodes. If you
use a partial node, jobs will likely interfere with each other,
reducing overall performance.

Now if your code only runs on N**2 nodes, using whole nodes can be
painful. But with M*N nodes, you're usually OK.

-- greg

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