4929

A 3D radiative transfer framework: XIII. OpenCL implementation

Peter H. Hauschildt, E. Baron
Hamburger Sternwarte, Gojenbergsweg 112, 21029 Hamburg, Germany
arXiv:1107.5719v1 [astro-ph.IM] (28 Jul 2011)

@article{2011arXiv1107.5719H,

   author={Hauschildt}, P.~H. and {Baron}, E.},

   title={"{A 3D radiative transfer framework: XIII. OpenCL implementation}"},

   journal={ArXiv e-prints},

   archivePrefix={"arXiv"},

   eprint={1107.5719},

   primaryClass={"astro-ph.IM"},

   keywords={Astrophysics – Instrumentation and Methods for Astrophysics, Astrophysics – Earth and Planetary Astrophysics, Astrophysics – Solar and Stellar Astrophysics},

   year={2011},

   month={jul},

   adsurl={http://adsabs.harvard.edu/abs/2011arXiv1107.5719H},

   adsnote={Provided by the SAO/NASA Astrophysics Data System}

}

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We discuss an implementation of our 3D radiative transfer (3DRT) framework with the OpenCL paradigm for general GPU computing. We implement 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 $Lstar$ and the operator splitting step. We present the results of a small and a large test case and compare the timing of the 3DRT calculations for serial CPUs and various GPUs. 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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