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Computing, Networking, Storage and Analysis
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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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Paper provided by the ACM Digital Library

Paper also available from IEEE Computer Society