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
ROOM:155-E
ABSTRACT:
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.
Chair/Author Details:
David H. Bailey (Chair) - Lawrence Berkeley National Laboratory
Tomoaki Ishiyama - Tsukuba University
Keigo Nitadori - Tsukuba University
Junichiro Makino - Tokyo Institute of Technology
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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:
TIME: 2:00PM - 2:30PM
SESSION CHAIR: David H. Bailey
AUTHOR(S):Tomoaki Ishiyama, Keigo Nitadori, Junichiro Makino
ROOM:155-E
ABSTRACT:
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.
Chair/Author Details:
David H. Bailey (Chair) - Lawrence Berkeley National Laboratory
Tomoaki Ishiyama - Tsukuba University
Keigo Nitadori - Tsukuba University
Junichiro Makino - Tokyo Institute of Technology
Click here to download .ics calendar file