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Explicit Message Passing as in PVM or MPI
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User breaks program into parts and the parts send messages between them to implement communication necessary for synchronization and integration of parts into solution of a single program
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This matches hardware but is not particularly natural for problem and can be machine dependent
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Object Oriented programming is like message passing but now objects and not programs communicate
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Very good when objects are natural from the problem and represent functional parallelism
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However in data parallel problems tackled with object oriented approach, one must break problem up into a number of objects that depends on number of processors and so reflects machine and not problem
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