[GE users] How to Request a Number of Empty Nodes?

Peter P Cebull Peter.Cebull at inl.gov
Thu Mar 3 18:07:40 GMT 2005


Reuti,

That was an obvious answer, now that you mention it. I'm not sure why it
didn't occur to me before.
Thanks!

Peter

Reuti <reuti at staff.uni-marburg.de> wrote on 03/03/2005 10:09:04 AM:

> Hi,
>
> what about setting the allocation rule just to 2 instead of
> $fill_up? This way
> I'm doing it for a program, where I must get the same number of CPUs on
all
> nodes.
>
> Cheers - Reuti
>
>
> Quoting Stephan Grell - Sun Germany - SSG - Software Engineer
> <stephan.grell at sun.com>:
>
> > Hello Peter,
> >
> > one can do it, but it is not straight forward.
> > One has to configure slots on the host level for every host.
> > Configure "-slots" as a load-formula with qconf -msconf.
> >
> > If you configure "-slots", the scheduler will pick empty hosts
> > first, and than the least loaded. If you configure "slots" it
> > will pick the loaded machines first and fill up the others later.
> >
> > Cheers,
> > Stephan
> >
> > Peter P Cebull wrote:
> >
> > > Hello Users,
> > >
> > > I am running some MPI benchmark jobs on our cluster using loosely
> > > integrated (for now) MPICH and LAM MPI. Each of the nodes in our
> > > cluster has two CPUs. The PE specifies the "fill_up" option, and I
> > > want the job (including slaves) to only be scheduled on empty nodes
> > > (0/2 slots occupied). So, for example, if I submit a job requesting
64
> > > slots, I want it to wait in the job list until 32 empty nodes are
> > > available, and NOT be started when 64 slots open up on various
> > > non-empty nodes.
> > >
> > > This seems to be a simple type of request -- can anyone suggest how
> > > this can be done? At first I thought specifying -l slots=2 would
cause
> > > the scheduler to look for nodes with two available slots, but that
> > > does not seem to be the case. Might I have to implement a load sensor
> > > to look for empty nodes?
> > >
> > > Thanks,
> > > Peter
> > > ____________________________________________
> > > Peter Cebull
> > > Idaho National Laboratory
> > > P.O. Box 1625, MS3605
> > > Idaho Falls, ID 83415
> > > Phone: 208-526-1909
> > > Email: Peter.Cebull at inl.gov
> > >
> >
> >
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>
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