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

Reuti reuti at staff.uni-marburg.de
Thu Mar 3 17:09:04 GMT 2005


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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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