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DTSTAMP:20210402T160105Z
LOCATION:Track 2
DTSTART;TZID=America/New_York:20201119T140000
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UID:submissions.supercomputing.org_SC20_sess148_pap508@linklings.com
SUMMARY:Acceleration of Fusion Plasma Turbulence Simulations using the Mix
 ed-Precision Communication-Avoiding Krylov Method
DESCRIPTION:Paper\n\nAcceleration of Fusion Plasma Turbulence Simulations 
 using the Mixed-Precision Communication-Avoiding Krylov Method\n\nIdomura,
  Ina, Ali, Imamura\n\nThe multi-scale full-f simulation of the next genera
 tion experimental fusion reactor ITER based on a five dimensional (5D) gyr
 okinetic model is one of the most computationally demanding problems in fu
 sion science. In this work, a Gyrokinetic Toroidal 5D Eulerian code (GT5D)
  is accelerated by a new mixed-precision communication-avoiding (CA) Krylo
 v method. The bottleneck of global collective communication on accelerated
  computing platforms is resolved using a CA Krylov method. In addition, a 
 new FP16 preconditioner, which is designed using the new support for FP16 
 SIMD operations on A64FX, reduces both the number of iterations (halo data
  communication) and the computational cost. The performance of the propose
 d method for ITER size simulations with approximately 0.1 trillion grids o
 n 1440 CPUs/GPUs on Fugaku and Summit shows 2.8x and 1.9x speedups, respec
 tively, above the conventional non-CA Krylov method, and excellent strong 
 scaling is obtained up to 5760 CPUs/GPUs.\n\nTag: Applications, Extreme Sc
 ale Computing, Mixed-precision\n\nRegistration Category: Tech Program Reg 
 Pass
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