Abstract
We have prepared a cosmological N-body code based on the Ahmad-Cohen method for vectorization on the FACOM VP-200 vector processor. The modifications are relatively simple, leaving the main algorithms essentially unchanged. Comparison with the scalar version shows an overall gain in speed of the particle integration exceeding a factor of 10 for test calculations with N=4000 particles. Similar principles can readily be applied to more complicated codes including two-body regularization, although the net gain will be somewhat less.
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References
Aarseth, S.J. (1985). Multiple Time Scales, eds. J.U. Brackbill and B.I. Cohen, (Academic Press, New York), p. 377.
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© 1986 Springer-Verlag
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Aarseth, S.J., Inagaki, S. (1986). Vectorization of N-body codes. In: Hut, P., McMillan, S.L.W. (eds) The Use of Supercomputers in Stellar Dynamics. Lecture Notes in Physics, vol 267. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0116414
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DOI: https://doi.org/10.1007/BFb0116414
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