我如何才能找到我的C程序的一个部分的执行时间？ [英] How can I find the execution time of a section of my program in C?

问题描述

我试图找到一种方式来获得C中的code部分的执行时间，我已经尝试过了时间（）和time.h中时钟（），但似乎时间（）返回秒，时钟（）似乎给我毫秒（或厘秒？）我想更多的东西precise虽然。有没有一种方法，我可以抢时间至少微秒precision？

I'm trying to find a way to get the execution time of a section of code in C. I've already tried both time() and clock() from time.h, but it seems that time() returns seconds and clock() seems to give me milliseconds (or centiseconds?) I would like something more precise though. Is there a way I can grab the time with at least microsecond precision?

这不仅需要能够编译Linux的。

This only needs to be able to compile on Linux.

推荐答案

您简称时钟（）和时间（） - 您寻找的函数gettimeofday（）？
这将填补在 timeval结构，其中包含秒和毫秒。

You referred to clock() and time() - were you looking for gettimeofday()? That will fill in a struct timeval, which contains seconds and microseconds.

当然实际分辨率可达硬件

Of course the actual resolution is up to the hardware.

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