[torquedev] nodes, procs, tpn and ncpus

Rushton Martin JMRUSHTON at qinetiq.com
Wed Jun 9 07:03:31 MDT 2010

>From a user perspective that is both lucid and logical.

Martin Rushton
Weapons Technologies
Tel: 01959 514777, Mobile: 07939 219057
email: jmrushton at QinetiQ.com
QinetiQ - Delivering customer-focused solutions

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-----Original Message-----
From: torquedev-bounces at supercluster.org
[mailto:torquedev-bounces at supercluster.org] On Behalf Of Ken Nielson
Sent: 09 June 2010 13:57
To: torquedev
Subject: [torquedev] nodes, procs, tpn and ncpus

Currently when TORQUE is asked to run a job with qrun it interprets the
nodes=x as only a single node. Glen, if you look at listelem and
node_spec you will see this is the case. TORQUE also ignores procs and

I am going to modify TORQUE so it will process these resources more like
we expect. 

procs=x will mean give me x processors anywhere.

nodes=x will mean the same as procs=x.
nodes=x:ppn=x will work as it currently does except that the value for
nodes will not be ignored. 
That is a node spec of -l nodes=2:ppn=2 will look for two nodes with two
available processors. This can be satisfied on the same host or
different hosts. Currently this node spec will only get two processors
on a single node.

ncpus=x will allocate x processors to a single task. They must be on the
same host.

tpn can be used like ppn and it will be interpreted to mean use exactly
x processors from each node.
A node spec of nodes=2:tpn=2 will allocate two processors on one node
and two processors on a separate node.

I am interested in your input. 


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