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A trial to improve parallel performance with these HPF/JA extensions has been also carried out. We have selected three-dimensional fluid code originally written in Fortran77 and have investigated the compatibility for these machines, using the same HPF source codes. In this paper, we have compared the HPF capability among Japanese HPF compilers that were implemented on NEC SX-4, SX-5, Fujitsu VPP800 and Hitachi SR8000. JAHPF is now expanded into a new organization, HPF Promoting Consortium (HPFPC) 5, where various HPF promotion activities are supported. The extensions include parallelization of loops with complicated reductions, asynchronous communication, user-controllable shadow, and communication pattern reuse for irregular remote data accesses. JAHPF has defined HPF/JA 4 as a set of HPF extensions to give users more control over sophisticated parallelization and communication optimizations. One of JAHPF’s purposes is to preserve the compatibility between Japanese HPF compilers and to make it possible for the users to program parallel codes easily, efficiently, and portably. JAHPF (Japan Association for HPF) 3, which has started in 1997, is an informal coalition of HPC users and computer vendors in Japan to promote the HPF language.
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#SIMPLY FORTRAN PURCHASE PORTABLE#
This situation forces inconveniences on scientific application users for developing portable programs, and it prevents the spread of parallel computing into the computational science community, even parallel programming is general to the computer science community. High Performance Fortran (HPF) 1, 2 was defined as a standard language that has described parallel paradigms, but there are practically many incompatibilities depending on vender implementations. Shingo Furubayashi, in Parallel Computational Fluid Dynamics 2002, 2003 1 INTRODUCTION