[Mauiusers] insufficient idle procs available ?

Itay M itaym.tau at gmail.com
Thu Jan 24 09:50:44 MST 2008


I'm a bit confused by the new nifty settings that you've just
suggested, and by the MAUI/TORQUE relationship with it. Maybe I should
expand my question:

We have one MAUI/Torque server with 3 queues. The user groups have a
MAXPROC soft/hard values (according to our usage policy). Is the
following configuration suggested?  -

In qmgr :
* unset the resources_max.ncpus from both server and queue levels
* unset the resources_default.ncpus from both server and queue levels
* should I make sure any other settings are unset?

In qsub:
* Ask the users that needs 4 processors on the same node to use the
nodes=1:ppn=4 (instead of "NCPUS=4)

Question is:
If I remove the resources_max.ncpus from the queue level - how will
MAUI/PBS know how much procs does the entire cluster has? Should I set
it somewhere else not mentioned here?



On Jan 23, 2008 11:56 AM, Jan Ploski <Jan.Ploski at offis.de> wrote:
> "Itay M" <itaym.tau at gmail.com> schrieb am 01/23/2008 10:12:27 AM:
>
> > I used your recommendation and did:
> >
> > unset queue <name of the queue> resources_default.ncpus
> >
> > Then I submitted a job and checked the Resource_List.ncpus value which
> > is now 4 :
> > Resource_List.ncpus = 4
> >
> > Before the change this value was 1.  It looks like that the
> > Resource_List.ncpus now equals to the resources_max.ncpus value. Is
> > this how it is supposed to be?
>
> I don't think so, but I don't have resources_max.ncpus either (I suggest
> you unset it, too). It could also be (more likely) that you have another
> resources_default.ncpus defined at the server level (qmgr list server),
> not at the queue level.
>
> > About multiprocessors - should the users submit it with "-l
> > nodes=1:ppn=4" instead of the "NCPUS=4" ?
>
> Yes, if they want 4 CPUs from the same machine (usually they do). If they
> don't care about which machines the 4 CPUs come from, that would be
> nodes=4 (strange as it may sound). It could be that some configuration
> parameters need to be set that affect the interpretation of nodes=4 to
> make it work (give it a try and see whether you get 4 CPUs or 4 machines
> with 1 CPU each).
>
> Regards,
> Jan Ploski
>
>


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