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34 lines
802 B
34 lines
802 B
4 years ago
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#include "mpi.h"
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#include <stdio.h>
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int main(argc,argv)
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int argc;
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char *argv[]; {
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int numtasks, rank, next, prev, buf[2], tag1=1, tag2=2;
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MPI_Request reqs[4];
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MPI_Status stats[4];
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MPI_Init(&argc,&argv);
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MPI_Comm_size(MPI_COMM_WORLD, &numtasks);
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MPI_Comm_rank(MPI_COMM_WORLD, &rank);
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prev = rank-1;
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next = rank+1;
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if (rank == 0) prev = numtasks - 1;
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if (rank == (numtasks - 1)) next = 0;
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MPI_Irecv(&buf[0], 1, MPI_INT, prev, tag1, MPI_COMM_WORLD, &reqs[0]);
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MPI_Irecv(&buf[1], 1, MPI_INT, next, tag2, MPI_COMM_WORLD, &reqs[1]);
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MPI_Isend(&rank, 1, MPI_INT, prev, tag2, MPI_COMM_WORLD, &reqs[2]);
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MPI_Isend(&rank, 1, MPI_INT, next, tag1, MPI_COMM_WORLD, &reqs[3]);
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MPI_Waitall(4, reqs, stats);
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printf("Process %d: Parelava ta stoixeia %d and %d\n", rank, buf[0], buf[1]);
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MPI_Finalize();
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}
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