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

[Jeff Hammond]

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
>
>
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-- 
Jeff Hammond
jeff.science at gmail.com