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DTSTAMP:20211207T054722Z
LOCATION:240-241-242
DTSTART;TZID=America/Chicago:20211116T160000
DTEND;TZID=America/Chicago:20211116T163000
UID:submissions.supercomputing.org_SC21_sess247_gb105@linklings.com
SUMMARY:A 400 Trillion-Grid Vlasov Simulation on Fugaku Supercomputer: Lar
 ge-Scale Distribution of Cosmic Relic Neutrinos in a Six-Dimensional Phase
  Space
DESCRIPTION:ACM Gordon Bell Finalist, Awards Presentation\n\nA 400 Trillio
 n-Grid Vlasov Simulation on Fugaku Supercomputer: Large-Scale Distribution
  of Cosmic Relic Neutrinos in a Six-Dimensional Phase Space\n\nYoshikawa, 
 Tanaka, Yoshida\n\nWe report a Vlasov simulation of cosmic relic neutrinos
  combined with N-body simulation of cold dark matter in the context of lar
 ge-scale structure formation in the universe performed on Fugaku supercomp
 uter. Gravitational dynamics of the neutrinos is followed, for the first t
 ime, by directly integrating the Vlasov equation in six-dimensional phase 
 space. Our largest simulation combines the Vlasov simulation on 400 trilli
 on grids and 330 billion-body calculations in a self-consistent manner, an
 d reproduces accurately the nonlinear dynamics of neutrinos in the univers
 e. The novel high-order Vlasov solver is optimized by combining an array o
 f state-of-the-art numerical schemes and fully utilizing the SIMD instruct
 ions on the A64FX processors.\n\nTime-to-solution of our simulation is an 
 order of magnitude shorter than the largest N-body simulations. The perfor
 mance scales excellently up to 147,456 nodes (7 million CPU cores) on Fuga
 ku; weak and strong scaling efficiencies are 82% to 96% and 82% to 93%, re
 spectively.\n\nTag: Accelerator-based Architectures, Applications, Computa
 tional Science, Extreme Scale Computing, Green Computing, Performance, Sci
 entific Computing\n\nRegistration Category: Tech Program Reg Pass
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