HIGH-PERFORMANCE FORTRAN LANGUAGES - ADVANCED APPLICATIONS AND THEIR IMPLEMENTATION

High Performance Fortran Languages such as Vienna Fortran and High Per formance Fortran (HPF) allow the programming of massively parallel mac hines at a relatively high level of abstraction, based on a user-speci fied distribution of data across the processors of the machine. In thi s paper we examine the parallelization of two advanced applications - which require irregular data and work distributions - in Vienna Fortra n and identify the reasons why the current version of HPF does not pro vide adequate functionality for formulating efficient parallel version s of these codes.