CO_assign_q4, C (gcc)

CO_assign_q4

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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main() {
	FILE * fp;
	fp = fopen ("output.csv","w");
	srand ((unsigned int ) time (NULL));
    double timeTaken;
    clock_t start;
    for (int size = 5; size <= 250; size +=5){// decrease the time if you get Kill signal (SIGKILL)
		int n = size;
		int a1[n][n];
		int a2[n][n];
		int amul[n][n];
		for(int ro1 =0; ro1<n; ro1++){
			for(int co1 = 0; co1<n; co1++ ){
				a1[ro1][co1] = rand()%10 ;
				int p = rand()%2;
				if (p==1)
					a1[ro1][co1] *= -1;
				}
			}
		for(int ro2 =0; ro2<n; ro2++){
			for(int co2 = 0; co2<n; co2++ ){
				a2[ro2][co2] = rand()%10;
				int q = rand()%2;
				if (q==1)
					a2[ro2][co2]*=-1;
				}
			}
		start = clock();
		for (int i = 1; i<= 5; i++){
			for(int ia = 0; ia <n; ia ++ ){
				for(int ib = 0; ib <n; ib++){
					amul[ia][ib] = 0;
					for(int ic = 0; ic<n; ic++){
						amul[ia][ib] +=a1[ia][ic] * a2[ic][ib];
						}	
					}
				}		
			}
    	timeTaken = (double)(clock() - start)/(CLOCKS_PER_SEC * 5);
    	printf("Time for %d: %.12f \n", n, timeTaken);
    	fprintf(fp,"%d,%d,%d,%.12f\n",n,n*n,3*n*n,timeTaken);
    }
    return 0;
}

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Compilation time: 0.25 sec, absolute running time: 1.95 sec, cpu time: 3.11 sec, memory peak: 3 Mb, absolute service time: 2,21 sec

Time for 5: 0.000001000000 Time for 10: 0.000007200000 Time for 15: 0.000019800000 Time for 20: 0.000031000000 Time for 25: 0.000038800000 Time for 30: 0.000078200000 Time for 35: 0.000158800000 Time for 40: 0.000256800000 Time for 45: 0.000300800000 Time for 50: 0.000475200000 Time for 55: 0.000631800000 Time for 60: 0.000800000000 Time for 65: 0.001006000000 Time for 70: 0.001225600000 Time for 75: 0.001507800000 Time for 80: 0.001846000000 Time for 85: 0.002235600000 Time for 90: 0.002669600000 Time for 95: 0.003078800000 Time for 100: 0.003562200000 Time for 105: 0.004313000000 Time for 110: 0.001355200000 Time for 115: 0.001554400000 Time for 120: 0.001731800000 Time for 125: 0.005549200000 Time for 130: 0.003249800000 Time for 135: 0.002603600000 Time for 140: 0.010274600000 Time for 145: 0.012130400000 Time for 150: 0.013364000000 Time for 155: 0.015460600000 Time for 160: 0.013762600000 Time for 165: 0.004521200000 Time for 170: 0.005854800000 Time for 175: 0.010085000000 Time for 180: 0.006675400000 Time for 185: 0.007350200000 Time for 190: 0.011802800000 Time for 195: 0.011670400000 Time for 200: 0.017728200000 Time for 205: 0.013935600000 Time for 210: 0.009899800000 Time for 215: 0.013804000000 Time for 220: 0.011028400000 Time for 225: 0.016635400000 Time for 230: 0.017409200000 Time for 235: 0.018636000000 Time for 240: 0.017644200000 Time for 245: 0.019768000000 Time for 250: 0.029781600000