[mpich-discuss] MPI_Dims_create() fails for nproc >1000000

[Andreas Schäfer]

Hi,

sure, please see attached.

Best
-Andreas


On 10:55 Thu 19 Dec     , Jeff Hammond wrote:
> Can you provide a short test that reproduces the issue you are seeing?
>  I will add a Trac ticket for it.
> 
> Thanks,
> 
> Jeff
> 
> On Thu, Dec 19, 2013 at 9:49 AM, Andreas Schäfer <gentryx at gmx.de> wrote:
> > Hi,
> >
> > I noticed that MPICH's MPI_Dims_create() fails with a floating point
> > exception, if the number of processes is larger than 10^6. Apparently
> > the reason is that the prime factors are hard coded into the code and
> > are limited to 1000 (or sqrt(10^6)). Open MPI's implementation has no
> > such limitation.
> >
> > Best
> > -Andreas
> >
> >
> > --
> > ==========================================================
> > Andreas Schäfer
> > HPC and Grid Computing
> > Chair of Computer Science 3
> > Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany
> > +49 9131 85-27910
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> 
> 
> -- 
> Jeff Hammond
> jeff.science at gmail.com
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-- 
==========================================================
Andreas Schäfer
HPC and Grid Computing
Chair of Computer Science 3
Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany
+49 9131 85-27910
PGP/GPG key via keyserver
http://www.libgeodecomp.org
==========================================================

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