In order to provide a grid programming environment for RPC-based master-worker type task parallelization of existing sequential application programs, we have designed a set of compiler directives called OpenGR, and been implementing this compiler system based on the Omni OpenMP compiler system and a grid-enabled RPC system, Ninf-G, as a parallel execution mechanism. With OpenGR directives, some existing sequential applications can easily be adapted to the grid environment as master-worker type parallel programs using RPC. Furthermore, using both OpenGR directives and the OpenMP directives enables "Hybrid parallelization" of the sequential programs.
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