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Subject: Re: [OMPI users] restricting a job to a set of hosts
From: Erik Nelson (nelsonerikd_at_[hidden])
Date: 2012-07-26 17:58:26


Reuti,

Thank you. Our queue is backed up, so it will take a little while before I
can try this.

I assume that by specifying the nodes this way, I don't need (and it would
confuse
the system) to add -nolocal. In other words, qsub will try to put the
parent node
somewhere in this set.

Is this the idea?

Erik

On Thu, Jul 26, 2012 at 4:48 PM, Reuti <reuti_at_[hidden]> wrote:

> Am 26.07.2012 um 23:33 schrieb Erik Nelson:
>
> > I have a purely parallel job that runs ~100 processes. Each process has
> ~identical
> > overhead so the speed of the program is dominated by the slowest
> processor.
> >
> > For this reason, I would like to restrict the job to a specific set of
> identical (fast)
> > processors on our cluster.
> >
> > I read the FAQ on -hosts and -hostfile, but it is still unclear to me
> what affect these
> > directives will have in a queuing environment.
> >
> > Currently, I submit the job using the "qsub" command in the "sge"
> environment as :
> >
> > qsub -pe mpich 101 jobfile.job
> >
> > where jobfile contains the command
> >
> > mpirun -np 101 -nolocal ./executable
>
> I would leave -nolocal out here.
>
> $ qsub -l
> "h=compute-5-[1-9]|compute-5-1[0-9]|compute-5-2[0-9]|compute-5-3[0-2]" -pe
> mpich 101 jobfile.job
>
> -- Reuti
>
>
> > I would like to restrict the job to nodes compute-5-1 to compute-5-32 on
> our machine,
> > each containing 8 cpu's (slots). How do I go about this?
> >
> > Thanks, Erik
> >
> > --
> > Erik Nelson
> >
> > Howard Hughes Medical Institute
> > 6001 Forest Park Blvd., Room ND10.124
> > Dallas, Texas 75235-9050
> >
> > p : 214 645 5981
> > f : 214 645 5948
> > _______________________________________________
> > users mailing list
> > users_at_[hidden]
> > http://www.open-mpi.org/mailman/listinfo.cgi/users
>
>
> _______________________________________________
> users mailing list
> users_at_[hidden]
> http://www.open-mpi.org/mailman/listinfo.cgi/users
>

-- 
Erik Nelson
Howard Hughes Medical Institute
6001 Forest Park Blvd., Room ND10.124
Dallas, Texas 75235-9050
p : 214 645 5981
f : 214 645 5948