HORIZON: Accelerated General Relativistic Magnetohydrodynamics

Burkhard Zink
Theoretical Astrophysics, Institute for Astronomy and Astrophysics, Eberhard-Karls University of Tubingen, Germany
arXiv:1102.5202 [gr-qc] (25 Feb 2011)


   author={Zink}, B.},

   title={“{HORIZON: Accelerated General Relativistic Magnetohydrodynamics}”},

   journal={ArXiv e-prints},




   keywords={General Relativity and Quantum Cosmology, Astrophysics – Instrumentation and Methods for Astrophysics, Physics – Computational Physics},




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


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We present Horizon, a new graphics processing unit (GPU)-accelerated code to solve the equations of general relativistic magnetohydrodynamics in a given spacetime. We evaluate the code in several test cases, including magnetized Riemann problems and rapidly rotating neutron stars, and measure the performance benefits of the GPU acceleration in comparison to our CPU-based code Thor. We find substantial performance gains in comparison to a quad-core CPU both in single- and double-precision accuracy, and discuss these findings in the context of future numerical modeling efforts.
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