Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Idomura, Yasuhiro
no journal, ,
Under the Post-K project, a Gyrokinetic Toroidal 5D full-f Eulerian code GT5D has been developed towards exascale burning plasma simulations on the Post-K machine. In this talk, we review the present status on new computational techniques on GT5D. The main computing part of GT5D is given by Krylov based sparse matrix solvers for a semi-implicit time integration. We have ported computing kernels of these solvers on a prototype machine of FUGAKU and on V100 GPU, and confirmed that almost ideal performance gains are achieved on these state-of-the-art many core and GPU architectures.
Ali, Y.*; Onodera, Naoyuki; Idomura, Yasuhiro; Ina, Takuya*; Imamura, Toshiyuki*
no journal, ,
Krylov solvers can account for up to 
90% of the total computing cost in extreme scale nuclear CFD simulations. In order to accelerate such CFD codes, we ported the conventional Preconditioned Conjugate Gradient (PCG) and the two latest communication avoiding algorithms, the Preconditioned Chebyshev Basis communication-avoiding Conjugate Gradient (P-CBCG) and the Communication-Avoiding Generalized Minimal RESidual (CA-GMRES) methods, on to GPUs. In this talk, we discuss a trade-off between the performance portability and the performance improvement for implementations using OpenACC and CUDA, and show performance tests on the latest GPU supercomputers.