小编Ali*_*gna的帖子

从这篇文章开始--Igor Ostrovsky 的处理器缓存效果库 - 我想在我自己的机器上玩他的例子.这是我的第一个示例的代码,它查看不同缓存行如何影响运行时间:

#include <iostream>
#include <time.h>

using namespace std;

int main(int argc, char* argv[])
{
    int step = 1;

    const int length = 64 * 1024 * 1024;
    int* arr = new int[length];

    timespec t0, t1;
    clock_gettime(CLOCK_REALTIME, &t0);
    for (int i = 0; i < length; i += step) 
        arr[i] *= 3;
    clock_gettime(CLOCK_REALTIME, &t1);

    long int duration = (t1.tv_nsec - t0.tv_nsec);
    if (duration < 0)
        duration = 1000000000 + duration;

    cout<< step << ", " << duration …