[torqueusers] ncpus anyone?

Gareth.Williams at csiro.au Gareth.Williams at csiro.au
Mon Mar 1 15:11:41 MST 2010


We've been avoiding ncpus to avoid the confusion.

Recently we started recommending use of the procs resource as an alternative to nodes.  I've asked for it to be better documented ([Cluster Resources #6822] procs resource documentation)

-- Gareth

> -----Original Message-----
> From: Si Hammond [mailto:simon.hammond at gmail.com]
> Sent: Tuesday, 2 March 2010 8:22 AM
> To: David Beer
> Cc: torqueusers
> Subject: Re: [torqueusers] ncpus anyone?
> 
> I have to admit to being pretty confused by the ncpus resource because I
> don't seem to be able to get it to run in the way I imagine it would.
> 
> What I'd really like it to mean is just pick me, say, 10 cores and get the
> job run. I don't care about the number of nodes or processors per node,
> job placement etc.
> 
> 
> 
> S.
> 
> On 1 Mar 2010, at 21:18, David Beer wrote:
> 
> > Hi all,
> >
> > I'm wondering if anyone uses ncpus for TORQUE (in the 2.3 and beyond
> versions). From looking through the users list's old entries, it seems
> that a lot of people are confused about this attribute and sometimes just
> decide to avoid it. From my testing, which I admit isn't extensive, it
> seems that this attribute is almost completely meaningless. For example,
> if a job is submitted with -l ncpus=10, it still appears to only run in
> one place. I see this in pbsnodes -a:
> >
> > jobs = 0/83.napali
> >
> > despite the fact that:
> >
> >    Resource_List.ncpus = 10
> >
> > appears in qstat -f's output. I'm wondering if there's anyone out there
> successfully using this feature, because it looks to me that TORQUE
> doesn't do anything with ncpus in its current state.
> >
> > Thanks for any light you can shed on this,
> >
> > --
> > David Beer | Senior Software Engineer
> > Adaptive Computing
> >
> > _______________________________________________
> > torqueusers mailing list
> > torqueusers at supercluster.org
> > http://www.supercluster.org/mailman/listinfo/torqueusers
> 
> 
> --------------------------------------------------------------------------
> -------------
> Si Hammond
> 
> Research & Knowledge Transfer Associate
> Performance Modelling, Analysis and Optimisation Team
> High Performance Systems Group
> Department of Computer Science
> University of Warwick, CV4 7AL, UK
> http://go.warwick.ac.uk/hpsg
> --------------------------------------------------------------------------
> --------------
> 
> 
> 
> 
> 
> 



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