A 3D radiative transfer framework. VIII. OpenCL implementation

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Radiative Transfer, Methods: Numerical

Scientific paper

Aims: We discuss an implementation of our 3D radiative transfer (3DRT) framework with the OpenCL paradigm for general GPU computing. Methods: We implemented the kernel for solving the 3DRT problem in Cartesian coordinates with periodic boundary conditions in the horizontal (x,y) plane, including the construction of the nearest neighbor Λ∗ and the operator splitting step. Results: We present the results of both a small and a large test case and compare the timing of the 3DRT calculations for serial CPUs and various GPUs. Conclusions: The latest available GPUs can lead to significant speedups for both small and large grids compared to serial (single core) computations.

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