算法运行的时间 [英] Time for an algorithm to run

问题描述

我正在尝试对算法计时，但时间始终显示为零。这是我的代码：

I'm trying to time my algorithm but the time always shows up as zero. Here is my code:

steady_clock::time_point start = steady_clock::now();
ReverseArray(list1, 1000000);
steady_clock::time_point end = steady_clock::now();
auto totalTime = end - start;
cout << duration_cast<microseconds>(totalTime).count()<< "\n";

推荐答案

如果您使用的是Windows，请使用此资源。

If you're on Windows, use this resource.

这对于亚微秒精度是有好处的。使用此命令：

It is good for sub-microsecond accuracy. Use this:

LARGE_INTEGER StartingTime, EndingTime, ElapsedMicroseconds;
LARGE_INTEGER Frequency;
QueryPerformanceFrequency(&Frequency); 
QueryPerformanceCounter(&StartingTime);
ReverseArray(list1, 1000000);
QueryPerformanceCounter(&EndingTime);
ElapsedMicroseconds.QuadPart = EndingTime.QuadPart - StartingTime.QuadPart;

ElapsedMicroseconds.QuadPart *= 1000000;
ElapsedMicroseconds.QuadPart /= Frequency.QuadPart;

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