數組分頁導致的效能損失驗證程式

#include <iostream>#include <ctime>using namespace std;#define N 4096void main(){int **a = new int*[N];for(int i = 0; i < N; i++) a[i] = new int[N];int **b = new int*[N];for(i = 0; i < N; ++i) b[i] = new int[N];int j;clock_t begin1 = clock();for(i = 0; i < N; ++i)for(j = 0; j < N; ++j)a[i][j] = 2;//為了避免new運算子執行時間的影響，先將兩個空間分配好clock_t end1 = clock();clock_t begin2 = clock();for(i = 0; i< N; ++i)for(j = 0; j < N; ++j)a[j][i] = 2;clock_t end2 = clock();cout << end1 - begin1 << endl;cout << end2 - begin2 << endl;}