Exploiting Physical Parallelism Using Supercomputers: Two Examples from Chemical Physics

\r I :; 3f N ow that parallel vector processors are replacing scalar procesN sors as a computational tool, scientists must reexamine the efficiency of existing code. The algorithms used and the code developed on scalar machines should be replaced by codes optimized for vector and parallel machines. New codes adapted to parallel computing should be written for a whole range of problems in chemistry and physics. Because most scientific application programs are and will probably continue to be written in Fortran, we will have to ?