Vector calculation of particle code (Q1067755)

The development of a vector computer requires the modification of the algorithm into a suitable form for vector calculation. Among many algorithms, the particle code is a typical example which has suffered damage in the calculation on supercomputers owing to its possibility of recurrent data access in collecting cell-wise quantities from particle quantities. In this article, we report a new method to liberate the particle code from recurrent calculations. But it should be noticed that the method may depend on the architecture of the supercomputer, and works well on FACOM VP-100 and VP-200: the indirect data accessing must be vectorized and its speed should be fast.