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High Performance Fortran (HPF) is an informal standard for extensions to Fortran 90 to assist its implementation on parallel architectures, particularly for data-parallel computation. Among other things, it includes directives for specifying data distribution across multiple memories, and concurrent execution features. This article provides a tutorial introduction to the main features of HPF.Any opinions and rccomrnendations containPd hPrPin arT those of the authors. and do not nece"arih repreH"nt the vir·w, of the High Perforrnancc Fortran Forum.

SUMMARYThis is the first of a series of papers on the Genesis distributed-memory benchmarks, which were developed under the European ESPRIT research program. The benchmarks provide a standard reference Fortran77 uniprocessor version, a distributed memory MIMD version, and in some cascs a Fortran90 vcrsion suitable for SIMD computers. The problems selected all have a scientific origin (mostly from physics or theoretical chemistry), and range from synthetic code fragments dcsigncd to mcasurc the basic hardware properties of the computer (especially communication and synchronisation overheads), through commonly used library submutines, to full application codes. This first paper defines the methodology to be used to analyse the benchmark results, and gives an example of a fully analysed application benchmark from General Relativity (CR1). First, suitable absolute performance metrics are carefully defined, then thc pcrformance analysis treats the execution time and absolute pcrformance as functions of at least two variables, namely the problem size and the number of proecssors. The theoretical predictions are compared with, or fitted to, the measured results, and then used to predict (with due caution) how the performance might scale for larger problems and more processors than were actually available during the benchmarking. Benchmark measurements are given primarily for the Geman SUPRENUM computer, but also for the IBM 30835, Convcx C210 and a Parsys Supernode with 32 T800-20 transputers.

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