[mpich-discuss] Largest number of MPI threads in a system

[Pavan Balaji]

FWIW, if you looking for “MPI tasks” instead of OS processes, FG-MPI, which is a derivative of MPICH has done 100 million MPI tasks.

http://www.mpich.org/2013/01/15/over-100-million-processes-with-mpich/

They had to make some changes to MPICH, which they are in the process of contributing back.

  —- Pavan

On Oct 31, 2013, at 3:18 PM, Jeff Hammond <jeff.science at gmail.com> wrote:

> Yes, we can :-)  I've run 64 ppn on 48 racks of Mira, which is 3145728
> MPI threads.  But this is not the best one can do...
> 
> From http://www.cs.rpi.edu/~chrisc/COURSES/PARALLEL/SPRING-2013/papers/sequoia-ross-pads-2013.pdf:
> 
> "The benchmark has 251 million PHOLD logical processes and was
> executed in several congurations up to a peak of 7.86 million MPI
> tasks running on 1,966,080 cores."
> 
> You'll need to get on to Tianhe-1 if you want to run on more
> _hardware_ threads that that.
> 
> Jeff
> 
> On Thu, Oct 31, 2013 at 1:59 PM, Bob Ilgner <bobilgner at gmail.com> wrote:
>> Hi Pavan,
>> 
>> With reference to your MPI on a million processors article, what is the
>> largest number of threads that you have encountered on a system.
>> 
>> I have run 500 000 MPI threads on an IBM system. Can any of you guys out
>> there top that ?
>> 
>> Regards, bob
>> 
>> 
>> 
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> 
> 
> -- 
> Jeff Hammond
> jeff.science at gmail.com
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--
Pavan Balaji
http://www.mcs.anl.gov/~balaji