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DTSTAMP:20181221T160731Z
LOCATION:C140/142
DTSTART;TZID=America/Chicago:20181114T133000
DTEND;TZID=America/Chicago:20181114T140000
UID:submissions.supercomputing.org_SC18_sess204_pap502@linklings.com
SUMMARY:Simulating the Wenchuan Earthquake with Accurate Surface Topograph
 y on Sunway TaihuLight
DESCRIPTION:Paper\nAlgorithms, Applications, Computational Physics, Scient
 ific Computing, Tech Program Reg Pass\n\nSimulating the Wenchuan Earthquak
 e with Accurate Surface Topography on Sunway TaihuLight\n\nChen, Fu, Wei, 
 He, Zhang...\n\nThis paper reports our efforts on performing 50-m resoluti
 on earthquake simulation of the Wenchuan Earthquake (Ms 8.0, China) on Sun
 way TaihuLight. To accurately capture the surface topography, we adopt a c
 urvilinear grid finite-difference method with a traction image free surfac
 e implementation and redesign the algorithm to reduce memory access costs 
 for heterogeneous many-core architectures. We then derive a performance mo
 del of our algorithm to guide and drive the further optimization and tunin
 g of various parameters using a genetic algorithm. A data layout transform
 ation is also proposed to improve the direct memory access (DMA) efficienc
 y further. Our efforts improve the simulation efficiency from 0.05% to 7.6
 %, with a sustained performance of 9.07 Pflops using the entire machine of
  the Sunway TaihuLight (over 10 million cores), and a large-scale simulati
 on of the Wenchuan earthquake with accurate surface topography and improve
 d coda wave effects.
URL:https://sc18.supercomputing.org/presentation/?id=pap502&sess=sess204
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