The Universe at extreme scale: Multi-petaflop sky simulation on the BG/Q
The Universe at extreme scale: Multi-petaflop sky simulation on the BG/Q
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DOI：
10.1109/sc.2012.106
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发表时间：
2012-11
期刊：
影响因子：
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通讯作者：
S. Habib;V. Morozov;H. Finkel;A. Pope;K. Heitmann;Kalyan Kumaran;T. Peterka;J. Insley;David Dani
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文献类型：
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作者：
S. Habib;V. Morozov;H. Finkel;A. Pope;K. Heitmann;Kalyan Kumaran;T. Peterka;J. Insley;David Dani
显著的观测进展已经建立了一个令人信服的交叉验证的宇宙模型。然而，这个模型的两个关键支柱--暗物质和暗能量--仍然是个谜。下一代巡天将绘制数十亿个星系的地图，以探索“黑暗宇宙”的物理学。这些调查的科学要求要求在极端尺度下进行模拟;这些将由HACC（混合/硬件加速宇宙学代码）框架提供。HACC新颖的算法结构允许在不同的架构之间进行调整，包括加速和多核系统。在IBM BG/Q上，HACC达到了前所未有的可扩展性能-目前在786，432个核心（48个机架）上的峰值和92%的并行效率为6.23 PFlops-在极端问题大小下，几乎达到了两万亿个粒子，比任何宇宙学模拟都要大。在这些尺度下的HACC模拟将首次能够在整个宇宙学调查中跟踪单个星系。
Remarkable observational advances have established a compelling cross-validated model of the Universe. Yet, two key pillars of this model -- dark matter and dark energy -- remain mysterious. Next-generation sky surveys will map billions of galaxies to explore the physics of the 'Dark Universe'. Science requirements for these surveys demand simulations at extreme scales; these will be delivered by the HACC (Hybrid/Hardware Accelerated Cosmology Code) framework. HACC's novel algorithmic structure allows tuning across diverse architectures, including accelerated and multi-core systems. On the IBM BG/Q, HACC attains unprecedented scalable performance - currently 6.23 PFlops at 62% of peak and 92% parallel efficiency on 786,432 cores (48 racks) - at extreme problem sizes with up to almost two trillion particles, larger than any cosmological simulation yet performed. HACC simulations at these scales will for the first time enable tracking individual galaxies over the entire volume of a cosmological survey.