SUMMARYVPP Fortran is a data parallel language that has been designed for the VPP series of supercomputers. In addition to pure data parallelism, it contains certain low-level features that were designed to extract high performance from user programs. A comparison of VPP Fortran and High-Performance Fortran (HPF) 2.0 shows that these low-level features are not available in HPF 2.0. The features include asynchronous interprocessor communication, explicit shadow, and the LOCAL directive. They were shown in VPP Fortran to be very useful in handling real-world applications, and they have been included in the HPF/JA extensions. They are described in the paper. The HPF/JA Language Specification Version 1.0 is an extension of HPF 2.0 to achieve practical performance for real-world applications and is a result of collaboration in the Japan Association for HPF (JAHPF). Some practical programming and tuning procedures with the HPF/JA Language Specification are described, using the NAS Parallel Benchmark BT as an example.

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The UXP/V HPF compiler, that has been developed for the VPP series vector-parallel supercomputers, extracts the highest performance from the hardware. However, it is getting difficult for developers to concentrate on a specific hardware. This paper describes a method of developing an HPF compiler for multiple platforms without losing performance. Advantage is taken of existing technology. The code generator and runtime system of VPP Fortran are reused for high-end computers; MPI is employed for general distributed environments, such as a PC cluster. Following a performance estimation on different systems, we discuss effectiveness of the method and open issues.