33 lines
691 B
C
33 lines
691 B
C
#include <stdio.h>
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#include <mpi.h>
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int main(int argc, char *argv[]) // ring
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{
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int size, rank;
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int partner_left, partner_right;
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int sum, sbuf, rbuf;
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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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partner_left = (rank - 1 + size) % size;
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partner_right = (rank + 1) % size;
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sum = 0;
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sbuf = rank;
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do {
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MPI_Sendrecv(&sbuf, 1, MPI_INT, partner_right, 0,
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&rbuf, 1, MPI_INT, partner_left, 0,
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MPI_COMM_WORLD, MPI_STATUS_IGNORE);
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sum += rbuf;
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sbuf = rbuf;
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} while (rbuf != rank);
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printf("%d %d\n", rank, sum);
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MPI_Finalize();
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return 0;
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}
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