Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 17: Poster Session II

P 17.15: Poster

Mittwoch, 2. April 2025, 16:15–18:15, ZHG Foyer 1. OG

Towards efficient accelerated 3D nonlinear MHD simulations with the finite element code JOREK — •Patrik Rác, Matthias Hölzl, and Ihor Holod — Max Planck Institute for Plasma Physics, Garching, Germany

Enabling next-generation simulations of realistic magnetic confinement fusion devices is crucial for understanding and controlling large-scale plasma instabilities. Current simulation codes, such as JOREK, are designed to run on traditional supercomputers but have yet to be optimized for efficient execution on modern accelerated platforms. With the increasing prevalence of accelerator architectures, like GPUs, in high-performance clusters, JOREK requires adaptation to harness the performance of these new systems. We ported the matrix construction and the iterative solver of the time-stepping loop to GPUs. Our approach aims for portability and minimal code changes, allowing scientists to continue working on the code and easily integrate future changes. We achieve this by combining OpenMP and highly optimized GPU libraries. By optimizing the code structure for GPU offloading and eliminating synchronization overhead through coloring the finite element mesh, we obtain comparable performance to the original CPU implementation, paving the way for fully integrated JOREK simulations on GPU-accelerated clusters. Future work will explore novel preconditioning methods, designed to run efficiently on accelerated hardware, with the possibility of harnessing machine learning for further acceleration.

Keywords: JOREK; MHD; GPU; HPC