Abstract
We have analyzed the effect of vectorization on several schemes of direct N-body integration. We find that an Aarseth-type code with a neighbour scheme, which is the fastest on a scalar processor, is still the fastest on vector processors for large N. For N=1000, the overall gain in speed is found to be a factor of 10 both in theory and experiment. In the presence of hard binaries, however, the gain is reduced significantly.
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References
Aarseth, S. J. (1985), in Multiple Time Scales, eds J. U. Brackbill and B. I. Cohen (Academic Press, New York), p 377.
Aarseth, S. J. (1963), Mon. Not. Roy. Astron. Soc., 126, 223.
Ahmad, A. and Cohen, L. (1973), J. Comp. Phys., 12, 389.
Makino, J. and Hut, P. (1986), in preparation.
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© 1986 Springer-Verlag
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Makino, J. (1986). Direct N-body simulation on supercomputers. 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/BFb0116405
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DOI: https://doi.org/10.1007/BFb0116405
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