Particle simulations were among the first applications to be implemented on scalar computers over forty years ago, and have since played an important role in many science and engineering applications [1,4]. Because of the inherent parallelism in all particle algorithms the advent of parallel computers has revolutionized this field: basically, the same set of calculations has to be performed for every particle in the system. At present, realistic simulations with a few million particles are possible using large parallel computers.
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