Journal of Computational Physics
MPICH-G2: a Grid-enabled implementation of the Message Passing Interface
Journal of Parallel and Distributed Computing - Special issue on computational grids
The Anatomy of the Grid: Enabling Scalable Virtual Organizations
International Journal of High Performance Computing Applications
Regular Paper: Interactive N-Body Simulations On the Grid: HLA Versus MPI
International Journal of High Performance Computing Applications
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We present performance results obtained by running a direct gravitational N-body code for astrophysical simulations across the Dutch DAS-2 and the pan-European CrossGrid computational grids. We find that the performance on large grids improves as the size of the N-body system increases because the computation to communication ratio becomes higher and a better load balance can be achieved. Communication among nodes residing in different locations across Europe becomes more evident as the number of locations increases. Nevertheless, contrary to our expectations, we find that the performance decreases only by about a factor three for a large simulation. We conclude that highly distributed computational Grid infrastructures can be used efficiently for simulating large gravitational N-body systems.