18BCE2182 ASSESS_3 Q2, C (gcc)

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//gcc 7.4.0

#include  <stdio.h>
#include  <stdlib.h>
#include  <time.h>
#include  <omp.h>
int main(void)
{
    int n=1024;
    int arr1[n][n];
    int arr2[n][n];
    int arr3[n][n];
    int i, j;
    for(i=0; i<n; i++) {
       for(j=0;j<n;j++) {
           arr1[i][j] = rand()%20;
           arr2[i][j] = rand()%20;
       }
    }
    double start = omp_get_wtime();
    //serial matrix addition
    for(i=0; i<n; i++) {
       for(j=0;j<n;j++) {
          arr3[i][j] = arr1[i][j]+arr2[i][j];
       }
    }
    double end = omp_get_wtime();
    printf("\nAddition in Serial is %f",end-start);
    start = omp_get_wtime();
    //serial matrix subtraction
    for(i=0; i<n; i++) {
       for(j=0;j<n;j++) {
          arr3[i][j] = arr1[i][j]-arr2[i][j];     
       }
    }
    end = omp_get_wtime();
    printf("\nSubtraction in Serial is %f",end-start);
    //addition in parallel
    start=omp_get_wtime();
    #pragma omp parallel for
    for(i=0; i<n; i++) {
       for(j=0;j<n;j++) {
          arr3[i][j] = arr1[i][j]+arr2[i][j];
       }
    }
    end=omp_get_wtime();
    printf("\nAddition in parallel is %f",end-start);
    //subtraction in parallel
    start=omp_get_wtime();
    #pragma omp parallel for
    for(i=0; i<n; i++) {
       for(j=0;j<n;j++) {
          arr3[i][j] = arr1[i][j]-arr2[i][j];
       }
    }
    end=omp_get_wtime();
    printf("\nSubtraction in parallel is %f",end-start);
    //addition in parallel static
    start=omp_get_wtime();
    #pragma omp parallel for schedule(static,16)
    for(i=0; i<n; i++) {
       for(j=0;j<n;j++) {
          arr3[i][j] = arr1[i][j]+arr2[i][j];
       }
    }
    end=omp_get_wtime();
    printf("\nAddition in parallel schedule :static is %f",end-start);
    //subtraction in parallel static
    start=omp_get_wtime();
    #pragma omp parallel for schedule(static,16)
    for(i=0; i<n; i++) {
       for(j=0;j<n;j++) {
          arr3[i][j] = arr1[i][j]-arr2[i][j];
       }
    }
    end=omp_get_wtime();
    printf("\nSubtraction in parallel schedule :static is %f",end-start);
    //addition in parallel dynamic
    start=omp_get_wtime();
    #pragma omp parallel for schedule(dynamic,16)
    for(i=0; i<n; i++) {
       for(j=0;j<n;j++) {
          arr3[i][j] = arr1[i][j]+arr2[i][j];
       }
    }
    end=omp_get_wtime();
    printf("\nAddition in parallel schedule :dynamic is %f",end-start);
    //subtraction in parallel dynamic
    start=omp_get_wtime();
    #pragma omp parallel for schedule(dynamic,16)
    for(i=0; i<n; i++) {
       for(j=0;j<n;j++) {
          arr3[i][j] = arr1[i][j]-arr2[i][j];
       }
    }
    end=omp_get_wtime();
    printf("\nSubtraction in parallel schedule :dynamic is %f",end-start);
    //addition in parallel guided
    start=omp_get_wtime();
    #pragma omp parallel for schedule(guided,16)
    for(i=0; i<n; i++) {
       for(j=0;j<n;j++) {
          arr3[i][j] = arr1[i][j]+arr2[i][j];
       }
    }
    end=omp_get_wtime();
    printf("\nAddition in parallel schedule :guided is %f",end-start);
    //subtraction in parallel guided
    start=omp_get_wtime();
    #pragma omp parallel for schedule(guided,16)
    for(i=0; i<n; i++) {
       for(j=0;j<n;j++) {
          arr3[i][j] = arr1[i][j]-arr2[i][j];
       }
    }
    end=omp_get_wtime();
    printf("\nSubtraction in parallel schedule :guided is %f",end-start);   
}

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Compilation time: 0.22 sec, absolute running time: 0.32 sec, cpu time: 0.48 sec, memory peak: 13 Mb, absolute service time: 0,7 sec