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30 lines
909 B
C++
30 lines
909 B
C++
1 year ago
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#include <mpi.h>
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#include <iostream>
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#include <unistd.h>
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int main(int argc, char* argv[])
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{
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double start, end;
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MPI_Init(&argc, &argv); //Initialize the MPI environment //TODO perche qui non (NULL, NULL) ??
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int world_size;
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MPI_Comm_size(MPI_COMM_WORLD, &world_size); //Get the number of processes
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int world_rank;
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MPI_Comm_rank(MPI_COMM_WORLD, &world_rank); //Get the number of process
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MPI_Barrier(MPI_COMM_WORLD);
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start = MPI_Wtime(); //Microsecond precision. Can't use time(), because each process will have a different "zero" time
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sleep(30);
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MPI_Barrier(MPI_COMM_WORLD);
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end = MPI_Wtime();
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if(world_rank == 0)
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std::cout << "Process (rank " << world_rank+1 << "/" << world_size << "): time of work is " << end-start << "seconds" << std::endl;
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MPI_Finalize(); //Clean up the MPI environment
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return 0;
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}
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