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Computational challenges towards strong scaling gyrokinetic Eulerian codes at Exa-scale

Idomura, Yasuhiro   

To study fusion plasma turbulence, the Gyrokinetic Toroidal 5D full-f Eulerian code GT5D has been developed. On the K-computer, inter-node parallelization techniques such as multi-dimensional/-layer domain decomposition and communication-computation overlap were developed, and strong scaling of GT5D was improved up to 73,728 nodes. However, extensions of GT5D towards burning plasmas including kinetic electrons and multi-species ions require greater computing power. Under the post-K project, we have developed computing techniques for the next generation platforms such as GPUs and MICs. In this talk, we discuss computational challenges related to complicated intra-node memory hierarchy on many core processors and relatively limited inter-node communication performance compared with accelerated computation.

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