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

[Jeff Hammond]

Thanks!

This has been filed as https://trac.mpich.org/projects/mpich/ticket/1992.

Best,

Jeff

On Thu, Dec 19, 2013 at 2:51 PM, Andreas Schäfer <gentryx at gmx.de> wrote:
> 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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>> > http://www.libgeodecomp.org
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>> >
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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
> ==========================================================
>
> (\___/)
> (+'.'+)
> (")_(")
> This is Bunny. Copy and paste Bunny into your
> signature to help him gain world domination!
>
> _______________________________________________
> discuss mailing list     discuss at mpich.org
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-- 
Jeff Hammond
jeff.science at gmail.com