[GE users] combined/composite complexes

Reuti reuti at staff.uni-marburg.de
Mon Apr 4 23:49:22 BST 2005


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Hi Mark,

you already suggested a Complex C, which you can use for your parallel jobs. 
For serial runs, you have to request:

-l C=1,B=1

this will lower both resources.

Cheers - Reuti


Quoting "Olesen, Mark" <Mark.Olesen at arvinmeritor.com>:

> Yet another license management problem :(
> 
> Our CFD software has two different FlexLM "features" in use that are
> tracked
> within gridengine via complexes:
> 
> Complex / Feature A
>   * licenses for parallel calculations.
> Complex / Feature B
>   * licenses for interactive / serial / parallel use.
> 
> 
> Generally, the system works quite well with this division. However, under
> certain circumstances, it is desirable to allow a parallel job use some of
> the licenses from complex B.
> 
> The first idea was to invent a virtual license group that represents the
> combination of A and B:
> 	Complex C = Complex A + Complex B
> 
> Oversubscription is, however, a very obvious problem.
> 
> What I need is a means of letting the gridengine know that it can use both
> types of resources:
> 
> For example,
> 	qsub -pe mpi 10 -l A=1,[B=1]
> could mean "use B as well if you run out of A"
> 
> If I were to know a priori the exact number of licenses B that I needed to
> use, I could write
> 	qsub -pe mpi 10 -l A=0.8,B=0.2
> 
> This, however, requires know the exact state of A & B when the job actually
> starts. Otherwise the internal bookkeeping will be incorrect, since the
> software always occupies all of feature A before it starts using feature B.
> 
> I'm hoping that someone has a solution or workaround in their bag-of-tricks
> (Andy + Reuti perhaps?) for this problem.
> 
> Regards,
> /mark
> 
> 
> Dr. Mark Olesen
> Principal Engineer Thermofluids Analysis
> ArvinMeritor Light Vehicle Systems
> ArvinMeritor Emissions Technologies GmbH
> Biberbachstr. 9
> D-86154 Augsburg, GERMANY
> tel: +49 (821) 4103 - 862
> fax: +49 (821) 4103 - 7862
> Mark.Olesen at ArvinMeritor.com
> 
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