Created
January 7, 2019 13:40
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| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <mpi.h> | |
| void f(double * b, double * e) | |
| { | |
| while(b != e) { | |
| *b += 2; | |
| ++b; | |
| } | |
| } | |
| double h(double * data) | |
| { | |
| double acc_rcv; | |
| MPI_Reduce(data, &acc_rcv, 1, MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD); | |
| return acc_rcv; | |
| } | |
| int main(int argc, char ** argv) | |
| { | |
| MPI_Init(&argc, &argv); | |
| int size = atoi(argv[1]); | |
| int ranks, rank_id; | |
| MPI_Comm_size(MPI_COMM_WORLD, &ranks); | |
| MPI_Comm_rank(MPI_COMM_WORLD, &rank_id); | |
| size /= ranks; | |
| int start = size * rank_id; | |
| double * data = (double*) malloc(sizeof(double)*size); | |
| f(data, data + size); | |
| double acc_rcv = h(data); | |
| if(rank_id == 0) | |
| printf("%f\n", acc_rcv); | |
| free(data); | |
| MPI_Finalize(); | |
| return 0; | |
| } |
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