Perfomance example [b]

gistfile1.c

#include <string.h>


enum {
    BIG = 1000000,
    SMALL = 1000
};

int main() {
    int i, j;
    unsigned a[BIG], b[BIG];
    memset(a, 0, BIG);
    memset(b, 0, BIG);

    for (i = 0 ; i < BIG ; i++) {
        for (j = 0 ; j < SMALL ; j++) {
            a[i] += b[i] + 10;
        }
    }
}


/*
 * $ gcc -o b.out b.c
 * $ time ./b.out
 * ./b.out  2.93s user 0.01s system 99% cpu 2.943 total
 *
 */