VIENNA FORTRAN m A FORTRAN LANGUAGE EXTENSION FOR DISTRIBUTED MEMORY MULTIPROCESSORS

Exploiting the performance potential of distributed memory machines requires a careful distribution of data across the processors. Vienna Fortran is a language extension of Fortran which provides the user with a wide range of facilities for such mapping of data structures. However, programs in Vienna Fortran are written using global data references. Thus, the user has the advantages of a shared memory programming paradigm while explicitly controlling the placement of data. In this paper, we present the basic features of Vienna Fortran along with a set of examples illustrating the use of these features. *The work described in this paper is being carried out as part of the research project "Virtual Shared Memory for Multiprocessor Systems with Distributed Memory" funded by the Austrian Research Foundation (FWF) under the grant number P7576-TEC and the ESPRIT project "An Automatic Parallelization System for Genesis" funded by the Austrian Ministry for Science and Research (BMWF). This research was also supported by the National Aeronautics and Space Administration under NASA contract NAS1-18605 while the authors were in residence at ICASE, Mail Stop 132C, NASA Langley Research Center, Hampton, VA 23666. The authors assume all responsibility for the contents of the paper. tDepartment of Statistics and Computer Science, University of Vienna, Rathausstrasse 19/II/3, A1010 Vienna AUSTRIA tICASE, MS 132C, NASA Langley Research Center, Hampton VA. 23666 USA