The program :
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#include <stdio.h>
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#include <mpi.h>
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int main(int argc, char *argv[])
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{
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char name[BUFSIZ];
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int length;
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MPI_Init(&argc, &argv);
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MPI_Get_processor_name(name, &length);
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printf("%s: hello world\n", name);
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MPI_Finalize();
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return 0;
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}