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Title:
Distributed N-body simulation on the grid using dedicated hardware
Authors:
Groen, Derek; Portegies Zwart, Simon; McMillan, Steve; Makino, Jun
Affiliation:
AA(Section Computational Science, University of Amsterdam, Amsterdam, The Netherlands; Astronomical Institute “Anton Pannekoek”, University of Amsterdam, Amsterdam, The Netherlands), AB(Section Computational Science, University of Amsterdam, Amsterdam, The Netherlands; Astronomical Institute “Anton Pannekoek”, University of Amsterdam, Amsterdam, The Netherlands), AC(Drexel University, Department of Physics, 3141 Chestnut St., Philadelphia, PA 19104, United States), AD(Department of Astronomy, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan)
Publication:
New Astronomy, Volume 13, Issue 5, p. 348-358. (NewA Homepage)
Publication Date:
07/2008
Origin:
ELSEVIER
Keywords:
95.10.Ce, 98.10.+z, 82.20.Wt, 89.20.Ff
DOI:
10.1016/j.newast.2007.11.004
Bibliographic Code:
2008NewA...13..348G

Abstract

We present performance measurements of direct gravitational N-body simulation on the grid, with and without specialized (GRAPE-6) hardware. Our intercontinental virtual organization consists of three sites, one in Tokyo, one in Philadelphia and one in Amsterdam. We run simulations with up to 196,608 particles for a variety of topologies. In many cases, high performance simulations over the entire planet are dominated by network bandwidth rather than latency. With this global grid of GRAPEs our calculation time remains dominated by communication over the entire range of N, which was limited due to the use of three sites. Increasing the number of particles will result in a more efficient execution. Based on these timings, we construct and calibrate a model to predict the performance of our simulation on any grid infrastructure with or without GRAPE. We apply this model to predict the simulation performance on the Netherlands DAS-3 wide area computer. Equipping the DAS-3 with GRAPE-6Af hardware would achieve break-even between calculation and communication at a few million particles, resulting in a compute time of just over ten hours for 1 N-body time unit.
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