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In recent years several implementations of molecular dynamics Ž . Ž . MD codes have been reported on multiple instruction multiple data MIMD machines. However, very few implementations of MD codes on single instruction Ž . multiple data SIMD machines have been reported. The difficulty in using pair lists of nonbonded interactions is the major problem with MD codes for SIMD machines, such that, generally, the full connectivity computation has been used. Ž . We present an algorithm, the global cut-off algorithm GCA , which permits the use of pair lists on SIMD machines. GCA is based on a probabilistic approach and requires the cut-off condition to be simultaneously verified on all nodes of the machine. The MD code used was taken from the GROMOS package; only the routines involved in the pair lists and in the computation of nonbonded interactions were rewritten for a parallel architecture. The remaining calculations were performed on the host computer. The algorithm has been tested on Quadrics computers for configurations of 32, 128, and 512 processors and for systems of 4000, 8000, 15,000, and 30,000 particles. Quadrics was developed by Ž . Istituto Nazionale di Fisica Nucleare INFN and marketed by Alenia Spazio. Q 1998 John Wiley & Sons, Inc. J Comput Chem 19: 685]694, 1998

Development of a parallel molecular dynamics code on SIMD computers: Algorithm for use of pair list criterion