SCHEDULE: NOV 12-18, 2011

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Performance Evaluations of Gyrokinetic Eulerian Code GT5D on Massively Parallel Multi-Core Platforms

SESSION: State of the Practice - Performance II

EVENT TYPE: State of the Practice

TIME: 1:30PM - 2:00PM

SESSION CHAIR: Yunquan Zhang

AUTHOR(S):Yasuhiro Idomura, Sebastien Jolliet

ROOM:TCC 202

ABSTRACT:
A gyrokinetic toroidal five dimensional Eulerian code GT5D [Y.Idomura et. al., Comput. Phys. Commun 179, 391 (2008)] is ported on five advanced massively parallel platforms and comprehensive benchmark tests are performed. Sustained performances of the GT5D kernel and their dependency on the memory bandwidth are discussed. By using a novel multi-layer hybrid parallelization model, the size of MPI communicators can be suppressed below ~100 up to ~10^7 cores, and the scalability is improved on multi-core platforms. In strong scaling tests, a good scalability is confirmed up to several thousands cores on every platforms, and the maximum sustained performance of ~19.4 Tflops (the peak ratio of ~10.1%) is achieved using 16384 cores of BX900.

Chair/Author Details:

Yunquan Zhang (Chair) - Lab. of Parallel Computing, ISCAS

Yasuhiro Idomura - Japan Atomic Energy Agency

Sebastien Jolliet - Japan Atomic Energy Agency

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The full paper can be found in the ACM Digital Library