I got more information:
Short version: yes, Open MPI is used on K and was used to power the 8PF runs.
On Jun 24, 2011, at 7:16 PM, Jeff Squyres wrote:
> OMPI powers 8 petaflops!
> (at least I'm guessing that -- does anyone know if that's true?)
> On Jun 24, 2011, at 7:03 PM, Rayson Ho wrote:
>> Interesting... page 11:
>> Open MPI based:
>> * Open Standard, Open Source, Multi-Platform including PC Cluster.
>> * Adding extension to Open MPI for "Tofu" interconnect
>> Grid Engine / Open Grid Scheduler
>> devel mailing list
> Jeff Squyres
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