Restructuring sequential Fortran code into a parallel/distributed application

A workable approach for modernization of existing software into parallel/distributed applications is through coarse-grain restructuring. If, for instance, entire subroutines of legacy code can be plugged into the new structure, the investment required for the re-discovery of the details of what they do can be spared. The resulting renovated software can then take advantage of the improved performance ooered by modern parallel/distributed computing environments, without rethinking or rewriting the bulk of their existing code. In this paper, we discuss one of our experiments using the new coordination language MANIFOLD to restructure an existing sequential numerical application written in Fortran 77, into a parallel/distributed application.