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63 lines
1.4 KiB
63 lines
1.4 KiB
#include <stdio.h>
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#include "mpi.h"
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main(int argc, char** argv)
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{
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int my_rank;
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int p, k;
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int b, size;
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int root;
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int matrixA[100];
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int loc_num;
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int loc_matrix[100];
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int loc_res[100];
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int final_res[100];
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int namelen;
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char proc_name[MPI_MAX_PROCESSOR_NAME];
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MPI_Init(&argc, &argv);
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MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
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MPI_Comm_size(MPI_COMM_WORLD, &p);
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MPI_Get_processor_name(proc_name, &namelen);
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if (my_rank == 0)
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{
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printf("YPOLOGISMOS THS PARASTASHS b * A \n\n");
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printf("DOSE THN TIMH TOY B:\n");
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scanf("%d", &b);
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printf("DOSE TO MHKOS TOY PINAKA A:\n");
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scanf("%d", &size);
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printf("DOSE TA STOIXEIA TOY PINAKA A MHKOYS %d:\n", size);
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for (k=0; k<size; k++)
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scanf("%d", &matrixA[k]);
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}
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root = 0;
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MPI_Bcast(&size, 1, MPI_INT, root, MPI_COMM_WORLD);
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MPI_Bcast(&b, 1, MPI_INT, root, MPI_COMM_WORLD);
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loc_num = size/p;
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root = 0;
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MPI_Scatter(matrixA, loc_num, MPI_INT, loc_matrix, loc_num, MPI_INT, root, MPI_COMM_WORLD);
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for (k=0; k<loc_num; k++)
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loc_res[k] = b*loc_matrix[k];
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printf("\n Process %d on %s : local results are : ", my_rank, proc_name);
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for (k=0; k<loc_num; k++) printf("%d ", loc_res[k]);
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printf("\n\n");
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root = 0;
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MPI_Gather(loc_res, loc_num, MPI_INT, final_res, loc_num, MPI_INT, root, MPI_COMM_WORLD);
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if (my_rank == 0)
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{
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printf("\n TELIKO APOTELESMA %d * A =\n", b);
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for (k=0; k<size; k++) printf("%d ", final_res[k]);
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printf("\n\n");
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}
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MPI_Finalize();
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}
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