IAU01448
Presentation type requested: EITHER
COSMOLOGICAL SIMULATIONS USING A SPECIAL PURPOSE COMPUTER
Ryutaro Susukita
Computational Science Division, RIKEN (The institute of Physical and Chemical Research)

Gravitational N-body simulation is a important tool for deriving observable predictions from cosmological models where analytical approach is difficult. Particle-particle-particle-mesh (P3M) is one of widely used algorithms for such simulations. We implemented a P3M code that uses a special-purpose computer MDGRAPE-2, which has been recently developed and calculates arbitrary central force accurately (the typical error is 10^-7) and fast. In P3M code, particle-particle force calculation for clustered particles is the most heavy, however, it is accelerated by MDGRAPE-2. It has been confirmed that basic statistics (correlation function, peculiar velocity, etc.) are correctly obtained for standard cosmological models. We simulated two million particles and compared the timing with that of an adaptive P3M code, a sophisticated variant of P3M, on a Pentium PC (2 GHz). The MDGRAPE-2 P3M code was more than 10 times faster for highly clustered particles, competitive with adaptive P3M on parallel computers. P3M using a special-purpose computer with low accuracy was previously implemented and timing comparison was reported only with the conventional P3M. Since MDGRAPE-2 can calculates other types of force than P3M, one MDGRAPE-2 hardware is available for various scientific simulations. For example, tree code, a different popular N-body algorithm also runs on MDGRAPE-2.

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