SCHEDULE: NOV 10-16, 2012
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4.45 Pflops Astrophysical N-Body Simulation on K Computer - The Gravitational Trillion-Body Problem
SESSION: ACM Gordon Bell Prize II
EVENT TYPE: ACM Gordon Bell Finalists
TIME: 2:00PM - 2:30PM
SESSION CHAIR: David H. Bailey
AUTHOR(S):Tomoaki Ishiyama, Keigo Nitadori, Junichiro Makino
As an entry for the 2012 Gorden Bell performance prize, we report performance results of astrophysical N-body simulations of one trillion particles performed on the full system of K computer. This is the first gravitational trillion-body simulation in the world. We describe the scientific motivation, the numerical algorithm, the parallelization strategy, and the performance analysis. Unlike many previous Gordon-Bell prize winners that used the tree algorithm for astrophysical N-body simulations, we used the hybrid TreePM method, for similar level of accuracy in which the short-range force is calculated by the tree algorithm, and the long-range force is solved by the particle-mesh algorithm. We developed a highly-tuned gravity kernel for short-range forces, and a novel communication algorithm for long-range forces. The average performance on 24576 and 82944 nodes of K computer are 1.53 and 4.45 Pflops, which correspond to 49% and 42% of the peak speed.
David H. Bailey (Chair) - Lawrence Berkeley National Laboratory
Tomoaki Ishiyama - Tsukuba University
Keigo Nitadori - Tsukuba University
Junichiro Makino - Tokyo Institute of Technology