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#include <stdio.h>
#include <mpi.h>
typedef struct {
int value;
int rank;
} Value_rank;
int main(int argc, char **argv) {
int rank, p,myrank;
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &myrank);
MPI_Comm_size(MPI_COMM_WORLD, &p);
Value_rank pair;
Value_rank max;
if(myrank==0)
{pair.rank=0;
pair.value=33;
}
if(myrank==1)
{pair.value=13;
pair.rank=1;
}
MPI_Reduce(&pair, &max, 1, MPI_DOUBLE_INT, MPI_MAXLOC, 0, MPI_COMM_WORLD);
if ( myrank == 0 ) {
printf("value is %d, rank is %d.\n", (int)max.value, max.rank);
}
MPI_Finalize();
return 0;
} |
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