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A number of scientific numerical codes can currently exploit GPUs withremarkable performance. In astrophysics, Enzo and Ramses are prime examples ofsuch applications. The two codes have been ported to GPUs adopting differentstrategies and programming models, Enzo adopting CUDA and Ramses using OpenACC.We describe here the different solutions used for the GPU implementation ofboth cases. Performance benchmarks will be presented for Ramses. The results ofthe usage of the more mature GPU version of Enzo, adopted for a scientificproject within the CHRONOS programme, will be summarised.

Numerical cosmology on the GPU with Enzo and Ramses