blocks|key|2629573|text|据我所知，在Windows上最好的方法是使用QueryPerformanceCounter和QueryPerformanceFrequency。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2629574|QueryPerformanceCounter(LARGE_INTEGER*)将性能计数器的值放入传递的LARGE_INTEGER中。|2629575|QueryPerformanceFrequency(LARGE_INTEGER*)将性能计数器递增的频率放入传递的LARGE_INTEGER中。|2629576|然后，您可以通过在执行开始时记录计数器，然后在执行结束时记录计数器来查找执行时间。从末尾减去起始值，得到计数器的变化，然后除以频率，得到以秒为单位的时间。|2629577|LARGE_INTEGER+start,+finish,+freq;
QueryPerformanceFrequency(&freq);
QueryPerformanceCounter(&start);
//+Do+something
QueryPerformanceCounter(&finish);
std::cout+<<+"Execution+took+"+
++++<<+((finish.QuadPart+-+start.QuadPart)+/+(double)freq.QuadPart)+<<+std::endl;|code-block|syntax|javascript|2629578|entityMap^0|M|N|1A|P|0|0|13|0|0|15|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|13|8|@]|D|@]|E|$]]|$1|L|3|M|5|N|7|14|8|@]|D|@]|E|$O|P]]|$1|Q|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|R|$]]

The best way on Windows, as far as I know, is to use <code>QueryPerformanceCounter</code> and <code>QueryPerformanceFrequency</code>.

<code>QueryPerformanceCounter(LARGE_INTEGER*)</code> places the performance counter's value into the LARGE_INTEGER passed.

<code>QueryPerformanceFrequency(LARGE_INTEGER*)</code> places the frequency the performance counter is incremented into the LARGE_INTEGER passed.

You can then find the execution time by recording the counter as execution starts, and then recording the counter when execution finishes. Subtract the start from the end to get the counter's change, then divide by the frequency to get the time in seconds.

<pre><code>LARGE_INTEGER start, finish, freq;
QueryPerformanceFrequency(&amp;freq);
QueryPerformanceCounter(&amp;start);
// Do something
QueryPerformanceCounter(&amp;finish);
std::cout &lt;&lt; "Execution took " 
 &lt;&lt; ((finish.QuadPart - start.QuadPart) / (double)freq.QuadPart) &lt;&lt; std::endl;
</code></pre>

blocks|key|4037642|text|这在Windows下也很简单--事实上，在<ctime>中定义的两个std::clock,+d上的函数都是相同的|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4037643|entityMap|0|LINK|mutability|MUTABLE|url|http://www.cplusplus.com/reference/clibrary/ctime/clock/^0|L|7|Y|D|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

It's pretty easy under Windows too - in fact it's the same function on both <a href="http://www.cplusplus.com/reference/clibrary/ctime/clock/" rel="nofollow noreferrer">std::clock, d</a>efined in <code>&lt;ctime&gt;</code>

blocks|key|4037752|text|您可以使用Windows+API函数GetTickCount()比较开始和结束时的值。分辨率在16ms的范围内。如果出于某种原因，您需要更细粒度的计时，则需要考虑QueryPerformanceCounter。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4037753|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/ms724408(VS.85).aspx|1|http://msdn.microsoft.com/en-us/library/ms644904(v=VS.85).aspx)^0|I|E|0|29|N|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

You can use the Windows API Function <a href="http://msdn.microsoft.com/en-us/library/ms724408(VS.85).aspx" rel="nofollow noreferrer">GetTickCount()</a> and compare the values at start and end. Resolution is in the 16 ms ballpark. If for some reason you need more fine-grained timings, you'll need to look at <a href="http://msdn.microsoft.com/en-us/library/ms644904(v=VS.85).aspx" rel="nofollow noreferrer">QueryPerformanceCounter</a>.

blocks|key|833836|text|C%2B%2B没有用于高粒度测量代码执行时间的内置函数，您必须求助于特定于平台的代码。对于Windows系统，请尝试QueryPerformanceCounter：http://msdn.microsoft.com/en-us/library/ms644904(VS.85).aspx|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|833837|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/ms644904(VS.85).aspx^0|26|1O|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

C++ has no built-in functions for high-granularity measuring code execution time, you have to resort to platform-specific code. For Windows try QueryPerformanceCounter: <a href="http://msdn.microsoft.com/en-us/library/ms644904(VS.85).aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/ms644904(VS.85).aspx</a>

blocks|key|4037715|text|您应该使用的函数取决于您需要的定时器的分辨率。其中一些给出了10毫秒的分辨率。这些函数更易于使用。其他的需要更多的工作，但提供更高的分辨率(在某些环境中可能会让您头疼)。不过，您的dev机器可能工作得很好)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4037716|http://www.geisswerks.com/ryan/FAQS/timing.html|offset|length|4037717|这篇文章提到：|4037718|4037719|timeGetTime|unordered-list-item|4037720|RDTSC+(处理器功能，而不是操作系统feature)|4037721|QueryPerformanceCounter|4037722|4037723|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1B|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Y|8|@]|9|@$D|Z|E|10|1|11]]|A|$]]|$1|F|3|G|5|6|7|12|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|13|8|@]|9|@]|A|$]]|$1|I|3|J|5|K|7|14|8|@]|9|@]|A|$]]|$1|L|3|M|5|K|7|15|8|@]|9|@]|A|$]]|$1|N|3|O|5|K|7|16|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|17|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|C]]]]

The functions you should use depend on the resolution of timer you need. Some of them give 10ms resolutions. Those functions are easier to use. Others require more work, but give much higher resolution (and might cause you some headaches in some environments. Your dev machine might work fine, though).

<a href="http://www.geisswerks.com/ryan/FAQS/timing.html" rel="nofollow noreferrer">http://www.geisswerks.com/ryan/FAQS/timing.html</a>

This articles mentions:

<ul>
<li>timeGetTime</li>
<li>RDTSC (a processor feature, not an OS feature)</li>
<li>QueryPerformanceCounter</li>
</ul>

blocks|key|4037867|text|C%2B%2B可以在许多平台上运行。为什么不使用在许多平台上也可以工作的东西，比如Boost库。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4037868|请查看Boost+Timer+Library的文档|4037869|我相信它是一个仅包含头文件的库，这意味着它的设置和使用都很简单……|4037870|entityMap|0|LINK|mutability|MUTABLE|url|http://www.boost.org/|1|http://www.boost.org/doc/libs/1_43_0/libs/timer/timer.htm^0|11|5|0|0|3|J|1|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]]|C|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@$A|W|B|X|1|Y]]|C|$]]|$1|F|3|G|5|6|7|Z|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|10|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]|P|$5|K|L|M|C|$N|Q]]]]

C++ works on many platforms. Why not use something that also works on many platforms, such as the <a href="http://www.boost.org/" rel="nofollow noreferrer">Boost</a> libraries.

Look at the documentation for the <a href="http://www.boost.org/doc/libs/1_43_0/libs/timer/timer.htm" rel="nofollow noreferrer">Boost Timer Library</a>

I believe that it is a header-only library, which means that it is simple to setup and use...

I am curious if there is a build-in function in C++ for measuring the execution time?
I am using Windows at the moment. In Linux it's pretty easy...

find c++ execution time

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我很好奇C++中是否有一个内置的函数来测量执行时间？我现在用的是Windows。在Linux中，这非常简单……

问查找c++执行时间
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