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DTSTART:19700308T020000
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DTSTAMP:20260522T150116Z
LOCATION:D161
DTSTART;TZID=America/Chicago:20181112T113000
DTEND;TZID=America/Chicago:20181112T115000
UID:submissions.supercomputing.org_SC18_sess158_ws_lasalss120@linklings.co
 m
SUMMARY:Communication Reduced Multi-Timestep Algorithm for Real-Time Wind 
 Simulation on GPU-Based Supercomputers
DESCRIPTION:Naoyuki Onodera, Yasuhiro Idomura, and Yussuf Ali (Japan Atomi
 c Energy Agency) and Takashi Shimokawabe (University of Tokyo)\n\nWe devel
 op a communication reduced multi-time-step (CRMT) algorithm for a Lattice 
 Boltzmann method (LBM) based on a block-structured adaptive mesh refinemen
 t (AMR). This algorithm is based on the temporal blocking method, and can 
 improve computational efficiency by replacing a communication bottleneck w
 ith additional computation. The proposed method is implemented on an extre
 me scale airflow simulation code CityLBM, and its impact on the scalabilit
 y is tested on GPU based supercomputers, TSUBAME and Reedbush. Thanks to t
 he CRMT algorithm, the communication cost is reduced by ∼ 64%, and weak an
 d strong scalings are improved up to ∼ 200 GPUs. The obtained performance 
 indicates that real time airflow simulations for about 2km square area wit
 h the wind speed of ∼ 5m/s is feasible using 1m resolution.\n\nTag: Algori
 thms, Heterogeneous Systems, Resiliency\n\nRegistration Category: Workshop
  Reg Pass\n\nSession Chairs: Vassil Alexandrov (Hartree Centre, STFC); Jac
 k Dongarra (University of Tennessee, Knoxville; Oak Ridge National Laborat
 ory (ORNL)); Christian Engelmann (Oak Ridge National Laboratory (ORNL)); a
 nd Al Geist (Oak Ridge National Laboratory (ORNL))\n\n
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