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  1. 防災科研関係論文

A 1.8 trillion degrees-of-freedom, 1.24 petaflops global seismic wave simulation on the K computer

https://nied-repo.bosai.go.jp/records/4979
https://nied-repo.bosai.go.jp/records/4979
f2b983ba-030e-4c67-a872-5dfd52c0cd69
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル A 1.8 trillion degrees-of-freedom, 1.24 petaflops global seismic wave simulation on the K computer
言語
言語 eng
著者 Seiji Tsuboi

× Seiji Tsuboi

en Seiji Tsuboi

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Kazuto Ando

× Kazuto Ando

en Kazuto Ando

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Takayuki Miyoshi

× Takayuki Miyoshi

en Takayuki Miyoshi

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Daniel Peter

× Daniel Peter

en Daniel Peter

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Dimitri Komatitsch

× Dimitri Komatitsch

en Dimitri Komatitsch

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Jeroen Tromp

× Jeroen Tromp

en Jeroen Tromp

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抄録
内容記述タイプ Other
内容記述 We present high-performance simulations of global seismic wave propagation with an unprecedented accuracy of 1.2?s seismic period for a realistic three-dimensional Earth model using the spectral element method on the K computer. Our seismic simulations use a total of 665.2 billion grid points and resolve 1.8 trillion degrees of freedom. To realize these large-scale computations, we optimize a widely used community software code to efficiently address all hardware parallelization, especially thread-level parallelization to solve the bottleneck of memory usage for coarse-grained parallelization. The new code exhibits excellent strong scaling for the time stepping loop, that is, parallel efficiency on 82,134 nodes relative to 36,504 nodes is 99.54%. Sustained performance of these computations on the K computer is 1.24 petaflops, which is 11.84% of its peak performance. The obtained seismograms with an accuracy of 1.2?s for the entire globe should help us to better understand rupture mechanisms of devastating earthquakes.
言語 en
書誌情報 en : The International Journal of High Performance Computing Applications

巻 30, 号 4, p. 411-422, 発行日 2016-11
出版者
言語 en
出版者 SAGE Publications
ISSN
収録物識別子タイプ EISSN
収録物識別子 1741-2846
DOI
関連識別子 10.1177/1094342016632596
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