Astrophysical particle simulations with large custom GPU clusters on three continents

K. R. Spurzem, P. Berczik, T. Hamada, K. Nitadori, G. Marcus, A. Kugel, R. Manner, I. Berentzen, J. Fiestas, R. Banerjee, R. Klessen,
National Astronomical Observatories of China, Chinese Academy of Sciences, 20A Datun Rd., Chaoyang District, Beijing 100012, China
Computer Science – Research and Development Vol. 26 No. 3-4, 2011 page(s): 145-151


   title={Astrophysical particle simulations with large custom GPU clusters on three continents},

   author={Spurzem, R. and Berczik, P. and Berentzen, I. and Nitadori, K. and Hamada, T. and Marcus, G. and Kugel, A. and M{\"a}nner, R. and Fiestas, J. and Banerjee, R. and others},

   journal={Computer Science-Research and Development},





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We present direct astrophysical N-body simulations with up to six million bodies using our parallel MPI-CUDA code on large GPU clusters in Beijing, Berkeley, and Heidelberg, with different kinds of GPU hardware. The clusters are linked in the cooperation of ICCS (International Center for Computational Science). We reach about one third of the peak performance for this code, in a real application scenario with hierarchically block time-steps and a core-halo density structure of the stellar system. The code and hardware is used to simulate dense star clusters with many binaries and galactic nuclei with supermassive black holes, in which correlations between distant particles cannot be neglected.
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