mm_omp

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <omp.h>
#include <sys/time.h>
#define N 3200
void multiplyMatrices(int first[][N], int second[][N], int result[][N])
{
    // Multiplying first and second matrices and storing it in result
    int i,j,k;
        #pragma omp parallel for
        for (i = 0; i < N; ++i) {
          for (j = 0; j < N; ++j) {
             for (k = 0; k < N; ++k) {
                result[i][j] += first[i][k] * second[k][j];
             }
          }
        }
}

void fill_matrices(int first[][N], int second[][N], int result[][N])
{
    srand(time(NULL)); // randomize seed
    for (int i = 0; i < N; i++){
        for (int j = 0; j < N; j++){
            first[i][j] = rand() % 10;
            second[i][j] = rand() % 10;
            result[i][j] = 0;
        }
    }
}
void print(int first[][N], int second[][N], int result[][N])
{
    srand48(time(NULL)); // randomize seed
    printf("First:\n");
    for (int i = 0; i <  N; i++){
        printf("[ ");
        for (int j = 0; j < N; j++){
            printf("%d ", first[i][j]);
        }
        printf("]\n");
    }
    printf("\nSecond:\n");
    for (int i = 0; i <  N; i++){
        printf("[ ");
        for (int j = 0; j < N; j++){
            printf("%d ", second[i][j]);
        }
        printf("]\n");
    }
    printf("\nResult:\n");
    for (int i = 0; i <  N; i++){
        printf("[ ");
        for (int j = 0; j < N; j++){
            printf("%d ", result[i][j]);
        }
        printf("]\n");
    }
}

int main()
{
    double start1, start2, stop1, stop2, execution_time1, execution_time2;
    omp_set_num_threads(omp_get_num_procs());
    int first[N][N], second[N][N], result[N][N];

    start1 = omp_get_wtime();
    fill_matrices(first, second, result);
    stop1 = omp_get_wtime();

    start2 = omp_get_wtime();
    multiplyMatrices(first, second, result);
    stop2 = omp_get_wtime();

    execution_time1 = stop2 - start1;
    execution_time2 = stop2 - start2;
    //print(first, second, result);
    printf("Total execution Time in seconds: %.10lf\n", execution_time1 );
    printf("MM execution Time in seconds: %.10lf\n", execution_time2 );
    return 0;
}