[GE users] 6.2u3 Exclusive Scheduling Feature

dev dev_hyd2001 at yahoo.com
Sun Sep 13 15:15:38 BST 2009

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You  create a complex for the exclusive node access feature. You can add that complex only to the nodes of your choice. If you before submitting the job know the number of cores required for your job, you could request the exclusive node feature and also request a queue instance on a host/hostgroup with the required number of cores so as not to waste too many cores on a host when you land on it exclusively.


--- On Sun, 9/13/09, reuti <reuti at staff.uni-marburg.de> wrote:

From: reuti <reuti at staff.uni-marburg.de>
Subject: Re: [GE users] 6.2u3 Exclusive Scheduling Feature
To: users at gridengine.sunsource.net
Date: Sunday, September 13, 2009, 1:57 PM

Am 11.09.2009 um 20:51 schrieb peeter:

> I'm looking for suggestions on how to best accomplish: request
> multiple cores on a single system.
> I was going down the PE path and then noticed the new 6.2u3 feature
> 'exclusive host scheduling'. It sounds like the new feature would
> work, but how would I get around having some systems with (4)cores
> and then some systems with (16)cores? In other words if a job uses
> the exclusive host feature of (4)cores but ends up on the system
> with (16) cores, doesn't the feature then freeze out the 12 cores
> on the (16)core system?

"exclusive" will give you the complete node. Whether you use all
cores, all available RAM, or the complete I/O (and maybe only one
core) is up to you. You can either use a PE to allow many jobs per
node, ot adjust the number of to be used cores in the jobscripts to
use always all available ones, e.g. for Open MP:

export OMP_NUM_THREADS=`grep -c processor /proc/cpuinfo`

-- Reuti

> Thanks, P
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