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Erschienen in:
2009 | OriginalPaper | Buchkapitel
A Particle-Mesh Integrator for Galactic Dynamics Powered by GPGPUs
verfasst von : Dominique Aubert, Mehdi Amini, Romaric David
Erschienen in: Computational Science – ICCS 2009
Verlag: Springer Berlin Heidelberg
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We present a particle-mesh N-body integrator running on GPU using CUDA. Relying on a grid-based description of the gravitational potential, it can simulate the evolution of self-interacting ‘stars’ in order to model e.g. galaxies. All the steps of the application have been ported on the GPU , namely 1/ an histogramming algorithm with CUDPP, 2/ of the resolution of the Poisson equation by means of FFT with CUFFT and multi-grid relaxation, 3/ of an optimized finite difference scheme to compute the accelerations of stars and 4/ of an update procedure for positions and velocities. We present several tests at different resolution, and reach a speedup from 2 to 50 depending on the resolution and on the test case.