用C测量执行时间（在Windows上） [英] Measure execution time in C (on Windows)

问题描述

有没有更好的函数或方法来衡量的时间比时钟（）在Windows功能？我有一个简短的操作，当我尝试时钟（）或的GetTickCount（）它说，它采取0.0秒。我需要一种方法以毫秒为单位或纳秒来衡量它。

Is there a better function or way to measure time than clock() function on Windows? I have a short operation and when I try clock() or gettickcount() it says it took 0.0 seconds. I need a way to measure it by miliseconds or nanoseconds.

推荐答案

您可以使用 QueryPerformanceCounter的和 QueryPerformanceFrequency的：

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

int main(void)
{
    LARGE_INTEGER frequency;
    LARGE_INTEGER start;
    LARGE_INTEGER end;
    double interval;

    QueryPerformanceFrequency(&frequency);
    QueryPerformanceCounter(&start);

    // code to be measured

    QueryPerformanceCounter(&end);
    interval = (double) (end.QuadPart - start.QuadPart) / frequency.QuadPart;

    printf("%f\n", interval);

    return 0;
}

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