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

[Jeff Hammond]

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