34 lines
623 B
C
34 lines
623 B
C
#include "mpi.h"
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#include <stdio.h>
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int main(int argc, char **argv) {
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int rank, size, err, n, sum;
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MPI_Init(&argc, &argv);
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MPI_Comm_size(MPI_COMM_WORLD, &size);
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MPI_Comm_rank(MPI_COMM_WORLD, &rank);
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printf("rank=%d size=%d\n", rank, size);
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n = rank + 1;
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sum = 4710;
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MPI_Barrier(MPI_COMM_WORLD);
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MPI_Reduce(&n, &sum, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);
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printf("Received in reduction=%d\n", sum);
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MPI_Barrier(MPI_COMM_WORLD);
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sum = 3710;
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MPI_Allreduce(&n, &sum, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD);
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printf("Received in allreduction =%d\n", sum);
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MPI_Finalize();
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return 0;
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}
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