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说明：  MPI is a language-independent communications protocol used to program parallel computers. Both point-to-point and collective communication are supported. MPI "is a message-passing application programmer interface, together with protocol and semantic specifications for how its features must behave in any implementation."[1] MPI s goals are high performance, scalability, and portability. MPI remains the dominant model used in high-performance computing today.[2] MPI is not sanctioned by any major standards body nevertheless, it has beco