VFC The Vienna Fortran Compiler

摘要

High Performance Fortran (HPF) offers an attractive high- level language interface for programming scalable parallel architectures providing the user with directives for the speci- fication of data distribution and delegating to the compiler the task of generating an explicitly parallel program. Available HPF compilers can handle regular codes quite efficiently, but dramatic performance losses may be encountered for ap- plications which are based on highly irregular, dynamically changing data structures and access patterns. In this paper we introduce the Vienna Fortran Compiler (VFC), a new source- to-source parallelization system for HPF+, an optimized ver- sion of HPF, which addresses the requirements of irregular applications. In addition to extended data distribution and work distribution mechanisms, HPF+ provides the user with language features for specifying certain information that de- cisively influence a program's performance. This comprises data locality assertions, non-local access specifications and the possibility of reusing runtime-generated communication schedules of irregular loops. Performance measurements of kernels from advanced applications demonstrate that with a high-level data parallel language such as HPF+ a perfor- mance close to handwritten message-passing programs can be achieved even for highly irregular codes.