Re: [Condor-users] Condor scheduler problem

[Jason Stowe <jstowe@xxxxxxxxxxxxxxxxxx>]

Hi Paula, 
In the absence of a Requirements _expression_, the condor_submit command will pick requirements for OpSys/Arch/etc. that match the machine you are currently running on. In essence, it assumes the batch command you are submitting will run on machines similar to the one you are submitting from.

The items you used as examples, like a preference for low average machines, are more apt use cases of the Rank _expression_. These policies can be specified both by users, through the submit file for a submission, and by administrators, for an entire Condor pool, through the NEGOTIATOR_PRE_JOB_RANK and NEGOTIATOR_POST_JOB_RANK configuration settings. The latter two configuration settings, in the central manager's configuration, enable administrators to set pool-wide preferences for the machines that jobs run on. For example, to achieve the lowest load average preference, you might set any of these rank expressions equal to  (100-LoadAvg).

Hope this helps. 

Best, 
Jason



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Jason A. Stowe
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On Sun, Jan 2, 2011 at 5:37 PM, Paula Marti­nez <pmart@xxxxxxxxxxx> wrote:

Hi all:

I would like to know how Condor chooses the nodes to submit a job IF no
requirements are specified. Does Condor select first the nodes with the
lowest load avarage, the greater up time???

Thanks!

Ing. Paula Marti­nez
ITU - Redes y Telecomunicaciones

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