Re: [condor-users] One vm or two?

[Alain Roy <roy@xxxxxxxxxxx>]

> I have condor running on a cluster of dual processor Intel boxes, each with
> 512meg of physical memory.  I'd like to be able to configure things so that
> each of these nodes can run either two small jobs or one big one.  Is this
> possible?

That's not particularly easy to do, sorry. Is it a serious problem if a big 
job runs on the same machine as a small job? You could do something like this:

  * Split it into three (yes, three) identical virtual machines.

  * Label one of the virtual machines as only running jobs that are
    labelled as "big jobs". (Use something like +BigJob = True" in
    your submit file.), and label the other two machine as only running
    small jobs.

  * Use JOB_RENICE_INCREMENT to change the priority of the small jobs
    to be less (or greater, if you prefer) than the big jobs, thus
    preventing too much interference.

This is a somewhat tricky setup. We have done something like this before, 
and a description of it has been written up. I encourage you to read it, to 
get an idea of some of the flexible policies you can use, even though we 
can't do exactly what you are asking for.

http://www.cs.wisc.edu/~pfc/bologna_batch_system.html

By the way, other Condor users should read these--it's a great example of 
how to do some really cool things with Condor.

This document in in MS Word format. If that's a problem for anyone, email 
me and I'll send you a PDF version. We should get a PDF version on the web 
page.

-alain


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