[torquedev] nodes, procs, tpn and ncpus

"Mgr. Šimon Tóth" SimonT at mail.muni.cz
Tue Jun 15 14:09:18 MDT 2010


>>>> The only place where we disagree is that you want to use "procs=X" where I want
>>>> to use "nodes=X". I see 2 major downsides: lots of coding work in torque, and
>>>> more confusing semantics with mixed (what does "-l nodes=X,procs=Y" mean?)
>>>>
>>>>
>>> procs=X works today (with Moab, I guess Maui would need to be fixed).
>>> No changes needed for TORQUE, except that TORQUE doesn't know what
>>> procs means, it just runs the job on the nodes Moab tells it too...
>>>
>>> so if you don't care about it not working without Moab, we have this
>>> solution today, and it works correctly with EXACTNODE.
>>>
>>> In my opinion, I think nodes=X,procx=Y should generate a syntax error...
>>> _______________________________________________
>>>
>>>
>> I have now changed my mind and agree with Glen that this is an error. My
>> reasoning is that to try and add it to the node spec as in -l
>> nodes=2:ppn=4+procs=2 is redundant. It is the same as -l nodes=2:ppn=4
>> -l procs=2. The later is already supported by TORQUE. TORQUE also throws
>> an error if the -l nodes=2:ppn=4+procs=2 syntax is used.
>>
>>    From a coding point of view it is much easier to support the current
>> syntax. We just now need to build in the ability to parse the -l procs=x
>> and translate it into usable processors for the job.
>>
>>
> Only one procs resource is allowed per qsub. Currently, if you do
> something like qsub -l procs=4 -l nodes=3 -l procs=2 the last procs
> statement is the one that gets used. So in this instance the
> Resource_List.procs element will be equal to 2.
>
> Just wanted to post the behavior.

That should be true for any resource passed through -l resource=value.

-- 
Mgr. Šimon Tóth

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