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Subject: Re: [OMPI devel] "Open MPI"-based MPI library used by K computer
From: Takahiro Kawashima (t-kawashima_at_[hidden])
Date: 2011-06-27 21:58:44

Dear Open MPI community,

I'm a member of MPI library development team in Fujitsu. Shinji
Sumimoto, whose name appears in Jeff's blog, is one of our bosses.

As Rayson and Jeff noted, K computer, world's most powerful HPC system
developed by RIKEN and Fujitsu, utilizes Open MPI as a base of its MPI
library. We, Fujitsu, are pleased to announce that, and also have special
thanks to Open MPI community.
We are sorry to be late announce!

Our MPI library is based on Open MPI 1.4 series, and has a new point-
to-point component (BTL) and new topology-aware collective communication
algorithms (COLL). Also, it is adapted to our runtime environment (ESS,

K computer connects 68,544 nodes by our custom interconnect.
Its runtime environment is our proprietary one. So we don't use orted.
We cannot tell start-up time yet because of disclosure restriction, sorry.

We are surprised by the extensibility of Open MPI, and have proved that
Open MPI is scalable to 68,000 processes level! We feel pleasure to
utilize such a great open-source software.

We cannot tell detail of our technology yet because of our contract
with RIKEN AICS, however, we will plan to feedback of our improvements
and bug fixes. We can contribute some bug fixes soon, however, for
contribution of our improvements will be next year with Open MPI

Best regards,

MPI development team,

> I got more information:
> Short version: yes, Open MPI is used on K and was used to power the 8PF runs.
> w00t!
> On Jun 24, 2011, at 7:16 PM, Jeff Squyres wrote:
> > w00t!
> >
> > 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
> >>
> >> Rayson