With the news that Open MPI is being used on the K supercomputer (i.e., the #1 machine on the June 2011 Top500 list), another colleague of mine, Ralph Castain — who focuses on the run-time system in Open MPI — pointed out that K has over 80,000 processors (over 640K cores!). That’s ginormous.
He was musing to me that it would be fascinating to see some of K’s run-time data for what most people don’t consider too interesting / sexy: MPI job launch performance.
For example, another public use of Open MPI is on Los Alamos National Lab’s RoadRunner, which has 3,000+ nodes at 4 processes per node (remember RoadRunner? It was #1 for a while, too).
It’s worth noting that Open MPI starts up full-scale jobs on RoadRunner — meaning that all processes complete MPI_INIT — in less than 1 minute.
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Tags: HPC, Open MPI, petaflop, Top500
A huge congratulations goes goes out to the RIKEN Advanced Institute for Computational Science and Fujitsu teams who saw the K supercomputer achieve over 8 petaflops in the June 2011 Top500 list, published this past week.
8 petaflops absolutely demolishes the prior record of about 2.5 petaflops. Well done!
A sharp-eyed user pointed out the fact that Open MPI was referenced in the “Programming on K Computer” Fujitsu slides (which is part of the overall SC10 Presentation Download Fujitsu site). I pinged my Fujitsu colleague on the MPI Forum, Shinji Sumimoto, to ask for a few more details — does K actually use Open MPI with some customizations for their specialized network? And did Open MPI power the 8 petaflop runs at an amazing 93% efficiency?
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Tags: HPC, Open MPI, petaflop, Top500
