mpiexec and # of prcoessors

[Bryan Putnam]

On Fri, 31 Mar 2006, Jimmy Tang wrote:

> 
> Hi Bryan,
> 
> you could try
> 
> mpiexec -n 512 ~/hpl/bin/....xhpl
> 
> where the -n switch just tells mpiexec to spawn off the needed number of
> processes.

Jimmy,

Yes, actually that is what we have been doing. I was thinking that perhaps 
there was e.g. an array size or some other parameter that was preventing 
mpiexec from working correctly for huge numbers (>600) of nodes, but I 
assume that is not the case and I need to look elsewhere for the problem.

Thanks!
Bryan

 > 
> 
> 
> Jimmy.
> 
> 
> On Fri, Mar 31, 2006 at 09:31:52AM -0500, Bryan Putnam wrote:
> > Dear mpiexec team,
> > 
> > I have a quick question regarding mpiexec-8.0 which we're using to run 
> > some benchmarks (HPL).
> > 
> > We've found that mpiexec works fine until we get to about 512+ nodes, and 
> > then the parallel job fails for various reasons. Is there an adjustable 
> > parameter in the mpiexec code that limits parallel jobs to 512 processors, 
> > or do you think the problem is likely not mpiexec related?
> > 
> > Thanks!
> > Bryan
> > 
> > 
> > 
> > Bryan Putnam                
> > Rosen Center for Advanced Computing, Purdue University
> > Young Hall (Rm. 519)
> > 302 Wood Street
> > West Lafayette, IN 47907-2108     
> > Ph 765-496-8225 Fax 765-494-0566
> > bfp at purdue.edu
> > 
> > 
> > 
> > 
> > 
> > _______________________________________________
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> > http://email.osc.edu/mailman/listinfo/mpiexec
> ---end quoted text---
> 
> -- 
> Jimmy Tang
> Trinity Centre for High Performance Computing,
> Lloyd Building, Trinity College Dublin.
> http://www.tchpc.tcd.ie/
>