sreesasu, C (gcc) - rextester

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#include <stdio.h>
#include<stdlib.h>
#include<time.h>

void multiply(int siz,int frst[][siz], int scnd[][siz], int xt[][siz]);
 
int main()
{
FILE* newfile;
newfile=fopen("file.csv","w");
for(int size=1;size<=1000;size+=10){
    int siz=size;
    double time;
    clock_t start;
    int frst[siz][siz];
    int scnd[siz][siz];
    int p,q;
    for(p=0;p<siz;p++)
    {
	    for(q=0;q<siz;q++)
	    {
	        frst[p][q]=1;
	        scnd[p][q]=1;
	    }
    }
    int xt[siz][siz]; 
    int i, j;
    start=clock();
    for(i=0;i<5;i++){
	multiply(size,frst, scnd, xt);
    }
    time= (double)(clock()-start)/(CLOCKS_PER_SEC*5); 
    printf("\nsize:%d  time:%.12f\n",size,time);
    fprintf(newfile,"%d,%d,%d,%.12f\n",siz,siz*siz,3*siz*siz,time);
}
fclose(newfile);
return 0;
}

void multiply(int siz,int frst[][siz], int scnd[][siz], int xt[][siz])
{
    int i, j, k;
    for (i = 0; i < siz; i++)
    {
        for (j = 0; j < siz; j++)
        {
            xt[i][j] = 0;
            for (k = 0; k < siz; k++)
                xt[i][j] += frst[i][k]*scnd[k][j];
        }
    }
}

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Compilation time: 0.24 sec, absolute running time: 5.38 sec, cpu time: 8.94 sec, memory peak: 3 Mb, absolute service time: 5,63 sec