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This article details a breakthrough in Earth system modeling where GPU acceleration via OpenACC enabled a 145.7x speedup on the JUPITER supercomputer, yet it highlights the emerging portability bottleneck of directive-based approaches for exascale computing. The core technical challenge discussed is the need to shift from compiler directives to Kokkos-based frameworks to maintain performance across heterogeneous hardware architectures like AMD and Intel systems.

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Kilometer-scale Earth modeling has supercomputers SCREAM under limits

Quantum ZeitgeistSeptember 3, 20266 min read

Simulating Earth systems at kilometer-scale resolution is now a critical need, demanding a throughput of 100+ simulated days per day.

To understand the physically coupled cycles of water, energy, and carbon, simulating the Earth system at kilometer-scale resolution is now a critical technical requirement. Achieving this demands a throughput of at least 100 simulated days per day, a threshold pushing the limits of current high-performance computing. The German effort is the Icosahedral Nonhydrostatic (ICON) model; however, researchers suggest a fundamental shift in ICON’s development is needed to thrive on European supercomputers like JUPITER, with breakthroughs made possible by the Simple Cloud-Resolving E3SM Atmosphere Model (SCREAM) and a Kokkos-based approach. ICON Achieves 1.25km Global Simulation with OpenACC on JUPITER Taking full advantage of NVIDIA’s Grace Hopper superchips on both Alps and JUPITER, researchers achieved the first…

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