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SCHEDULE: NOV 16-21, 2014
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24.77 Pflops on a Gravitational Tree-Code to Simulate the Milky Way Galaxy with 18600 GPUs
SESSION: ACM Gordon Bell Finalist II
EVENT TYPE: Award Presentations & Award Talks, ACM Gordon Bell Finalists
TIME: 2:00PM - 2:30PM
SESSION CHAIR: Subhash Saini
AUTHOR(S):Jeroen Bédorf, Evghenii Gaburov, Michiko S. Fujii, Keigo Nitadori, Tomoaki Ishiyama, Simon Portegies Zwart
ROOM:New Orleans Theater
ABSTRACT:
We have simulated, for the first time, the long term evolution of the Milky Way Galaxy using 51 billion particles on the Swiss Piz Daint supercomputer with our N-body gravitational tree-code Bonsai. Herein, we describe the scientific motivation and numerical algorithms. The Milky Way model was simulated for 6 billion years, during which the bar structure and spiral arms were fully formed. This improves upon previous simulations by using 1000 times more particles, and provides a wealth of new data that can be directly compared with observations. We also report the scalability on both the Swiss Piz Daint and the US ORNL Titan. On Piz Daint the parallel efficiency of Bonsai was above 95%. The highest performance was achieved with a 242 billion particle Milky Way model using 18600 GPUs on Titan, thereby reaching a sustained GPU and application performance of 33.49 Pflops and 24.77 Pflops respectively.
Chair/Author Details:
Subhash Saini (Chair) - NASA Ames Research Center
Jeroen Bédorf - Leiden University
Evghenii Gaburov - SURFsara
Michiko S. Fujii - National Astronomical Observatory of Japan
Keigo Nitadori - RIKEN
Tomoaki Ishiyama - University of Tsukuba
Simon Portegies Zwart - Leiden University
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