SCHEDULE: NOV 10-16, 2012
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Communication Overlap Techniques for Improved Strong Scaling of Gyrokinetic Eulerian Code Beyond 100k Cores on K-Computer
SESSION: Research Poster Reception
EVENT TYPE: Posters and Electronic Posters
TIME: 5:15PM - 7:00PM
SESSION CHAIR: Torsten Hoefler
AUTHOR(S):Yasuhiro Idomura, Motoki Nakata, Susumu Yamada, Toshiyuki Imamura, Tomohiko Watanabe, Masahiko Machida, Masanori Nunami, Hikaru Inoue, Shigenobu Tsutsumi, Ikuo Miyoshi, Naoyuki Shida
ROOM:East Entrance
ABSTRACT:
A plasma turbulence research based on 5D gyrokinetic simulations is one of the most critical and demanding issues in fusion science. To pioneer new physics regimes both in problem sizes and in time scales, an improvement of strong scaling is essential. Overlap of computations and communications is a promising approach, but it often fails on practical applications with conventional MPI libraries. In this work, this classical issue is clarified, and resolved by developing communication overlap techniques with mpi_test and communication threads, which work even on conventional MPI libraries and hardwares. These techniques dramatically improve the parallel efficiency of a gyrokinetic Eularian code GT5D on K and Helios, which adopt dedicated and commodity networks. On K, excellent strong scaling is confirmed beyond 10^5 cores with keeping the peak ratio of 10% (307 TFlops at 196,608 cores), and simulations for ITER-size fusion devices are significantly accelerated.
Chair/Author Details:
Torsten Hoefler (Chair) - ETH Zurich
Yasuhiro Idomura - Japan Atomic Energy Agency
Motoki Nakata - Japan Atomic Energy Agency
Susumu Yamada - Japan Atomic Energy Agency
Toshiyuki Imamura - RIKEN
Tomohiko Watanabe - National Institute for Fusion Science
Masahiko Machida - Japan Atomic Energy Agency
Masanori Nunami - National Institute for Fusion Science
Hikaru Inoue - Fujitsu
Shigenobu Tsutsumi - Fujitsu
Ikuo Miyoshi - Fujitsu
Naoyuki Shida - Fujitsu
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Communication Overlap Techniques for Improved Strong Scaling of Gyrokinetic Eulerian Code Beyond 100k Cores on K-Computer
SESSION: Research Poster Reception
EVENT TYPE:
TIME: 5:15PM - 7:00PM
SESSION CHAIR: Torsten Hoefler
AUTHOR(S):Yasuhiro Idomura, Motoki Nakata, Susumu Yamada, Toshiyuki Imamura, Tomohiko Watanabe, Masahiko Machida, Masanori Nunami, Hikaru Inoue, Shigenobu Tsutsumi, Ikuo Miyoshi, Naoyuki Shida
ROOM:East Entrance
ABSTRACT:
A plasma turbulence research based on 5D gyrokinetic simulations is one of the most critical and demanding issues in fusion science. To pioneer new physics regimes both in problem sizes and in time scales, an improvement of strong scaling is essential. Overlap of computations and communications is a promising approach, but it often fails on practical applications with conventional MPI libraries. In this work, this classical issue is clarified, and resolved by developing communication overlap techniques with mpi_test and communication threads, which work even on conventional MPI libraries and hardwares. These techniques dramatically improve the parallel efficiency of a gyrokinetic Eularian code GT5D on K and Helios, which adopt dedicated and commodity networks. On K, excellent strong scaling is confirmed beyond 10^5 cores with keeping the peak ratio of 10% (307 TFlops at 196,608 cores), and simulations for ITER-size fusion devices are significantly accelerated.
Chair/Author Details:
Torsten Hoefler (Chair) - ETH Zurich
Yasuhiro Idomura - Japan Atomic Energy Agency
Motoki Nakata - Japan Atomic Energy Agency
Susumu Yamada - Japan Atomic Energy Agency
Toshiyuki Imamura - RIKEN
Tomohiko Watanabe - National Institute for Fusion Science
Masahiko Machida - Japan Atomic Energy Agency
Masanori Nunami - National Institute for Fusion Science
Hikaru Inoue - Fujitsu
Shigenobu Tsutsumi - Fujitsu
Ikuo Miyoshi - Fujitsu
Naoyuki Shida - Fujitsu
Click here to download .ics calendar file