18BCE2182 ASSESS_1 Q2-3, C (gcc)

18BCE2182 ASSESS_1 Q2-3

#include <stdio.h>
#include <stdlib.h>
#include <omp.h>
#define M 5
#define N 5

int main(int argc, char *argv)
{
    omp_set_num_threads(8);
    int i,j,k;
    double sum;
    double start, end, start_p, end_p;
    double **A, **B, **C;
    
    A= malloc(M*sizeof(double *));
    B= malloc(M*sizeof(double *));
    C= malloc(M*sizeof(double *));
    
    for(i=0; i<M; i++)
    {
        A[i]= malloc(N*sizeof(double));
        B[i]= malloc(N*sizeof(double));
        C[i]= malloc(N*sizeof(double));
    }
    for(i=0; i<M; i++)
    {
        for(j=0; j<N; j++)
        {
            A[i][j]=rand();
            B[i][j]=rand();
            C[i][j]=rand();
        }
    }
    start= omp_get_wtime();
    for(i=0; i<M; i++)
    {
        for(j=0; j<N; j++)
        {
            sum=0;
            for(k=0; k<M; k++)
            {
                sum+=A[i][k]*B[k][j];
            }
            C[i][j]=sum;
        }
    }
    end= omp_get_wtime();
    printf("Serial Execution Time: %f\n\n",(end-start));
    //////////////////////////////////
    start_p= omp_get_wtime();
    #pragma omp parallel for private(j)
    for(i=0; i<M; i++)
    {
        for(j=0; j<N; j++)
        {
            sum=0;
            for(k=0; k<M; k++)
            {
                sum+=A[i][k]*B[k][j];
            }
            C[i][j]=sum;
        }
    }
    end_p= omp_get_wtime();
    printf("Parallel Execution Time: %f\n\n",(end_p-start_p));
    return 0;
}


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