mpiexec and # of prcoessors

[Jimmy Tang]

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.


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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---end quoted text---

-- 
Jimmy Tang
Trinity Centre for High Performance Computing,
Lloyd Building, Trinity College Dublin.
http://www.tchpc.tcd.ie/