Re: [Condor-users] (no subject)

[rnayar@xxxxxxxx]

Darin,

Sure man, the Classad mechanism is a very powerful and integral part of Condor.
 To fully exploit it, you just need to muck around with it and try not to tick
people off in the process.

Cheers

Danny 



Quoting Darin Kalisak <whognu@xxxxxxxxx>:

> Thanks to you both for your help.  I guess my confusion was that I
> thought that job class ads could already reference anything in the
> computers' config files.  But as I understand it now, these parameters
> are not accessible to jobs unless they are also placed in the
> STARTD_EXPRS.  So, if I have HasMatlab = True in a config file, but
> not in STARTD_EXPRS, it does nothing, and job ads trying to access it
> will not be able to see that it is there?
> 
> On 5/17/06, rnayar@xxxxxxxx <rnayar@xxxxxxxx> wrote:
> > Hi Darin,
> >
> > Yeah I think you are right. The startd_exprs is associated with the
> classad
> > mechanism. So for example if you wanted to advertise a machine that has
> > Matlab
> > you would modifiy a machines local configuration file to say something
> > like..
> >
> > HasMatlab = True
> > STARTD_ATTRS = HasMatlab
> >
> > Then send a condor_reconfig to that machine.
> >
> > Then to see whether or not that classad appeared on that machine you
> would
> > type..
> >
> > condor_status -l <the-machine-with-matlab>
> >
> > In that output, you should expect to see a line in the output that says..
> >
> > HasMatlab = True
> >
> > Then all what you would need to do when submitting a job to run only on a
> > machine with matlab is make sure that HasMatlab = True is a requirement.
> >
> > One way to look at Start_exprs is a method to add additional information
> > already advertised by your machine anyway through the condor_startd
> daemon.
> >
> > Hope any of this helps
> >
> > Cheers,
> >
> > Danny Nayar
> > New Mexico State University
> >
> >
> >
> > Quoting Darin Kalisak <whognu@xxxxxxxxx>:
> >
> > > Hello all.
> > >
> > > I'm not exactly clear about the distinction and interplay between the
> > > START and STARTD_EXPRS machine configuration parameters.
> > >
> > > Is it fair to say that the START parameter describes when the machine
> > > is willing to run (by setting requirements on jobs' class ads),
> > > whereas the STARTD_EXPRS adds any user-defined parameters to the
> > > machine's class ad?
> > >
> > > If so, why is STARTD_EXPRS necessary?  I'm particularly looking at
> > >
> >
> http://www.cs.wisc.edu/condor/manual/v6.7/7_2Setting_up.html#SECTION008250000000
> > 00000000,
> > > about requiring packages to be installed on a machine.  If the user
> > > defines a boolean parameter MY_PACKAGE_INSTALLED, why wouldn't job
> > > class ads be able to access that directly, without going through
> > > STARTD_EXPRS?
> > >
> > > Thanks,
> > >
> > > Darin
> > >
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> > >
> >
> >
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