foap4 shows that adaptive mesh refinement for Euler gas dynamics runs efficiently on GPUs via OpenACC and MPI even with small 8^3 or 16^3 cell blocks.
H-AMR: A New GPU-accelerated GRMHD Code for Exascale Computing with 3D Adaptive Mesh Refinement and Local Adaptive Time Stepping
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foap4: Adaptive mesh refinement with OpenACC, MPI, and p4est
foap4 shows that adaptive mesh refinement for Euler gas dynamics runs efficiently on GPUs via OpenACC and MPI even with small 8^3 or 16^3 cell blocks.