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HPF runs on SIMD and MIMD machines and is high level as it expresses a style of programming or problem architecture
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MPI runs on MIMD machines (in principle it could run on SIMD but unnatural and inefficient) -- it expresses a machine architecture
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Traditional Software Model is
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Problem --> High Level Language --> Assembly Language --> Machine
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Expresses Problem Expresses Machine
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So in this analogy MPI is universal "machine-language" of Parallel processing
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MPI can be built efficiently at low risk whereas HPF compiler is difficult project with many unsolved issues
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