如何在Windows上测量C ++的CPU时间，并包括调用system（）？ [英] How can I measure CPU time in C++ on windows and include calls of system()?

问题描述

我想在C ++算法上运行一些基准测试，并想要获得CPU所需的时间，具体取决于输入。我在Windows 7上使用Visual Studio 2012.我已经发现一种方法来计算Windows中的CPU时间：

I want to run some benchmarks on a C++ algorithm and want to get the CPU time it takes, depending on inputs. I use Visual Studio 2012 on Windows 7. I already discovered one way to calculate the CPU time in Windows: How can I measure CPU time and wall clock time on both Linux/Windows?

但是，我在我的算法中使用 system（）命令，这是不是这样测量的。那么，如何测量CPU时间，并通过system（）包括我的脚本调用的时间？

However, I use the system() command in my algorithm, which is not measured that way. So, how can I measure CPU time and include the times of my script calls via system()?

我应该添加一个小例子。这是我的get_cpu_time函数（从上面的链接）：

I should add a small example. This is my get_cpu_time-function (From the link described above):

double get_cpu_time(){
    FILETIME a,b,c,d;
    if (GetProcessTimes(GetCurrentProcess(),&a,&b,&c,&d) != 0){
        //  Returns total user time.
        //  Can be tweaked to include kernel times as well.
        return
            (double)(d.dwLowDateTime |
            ((unsigned long long)d.dwHighDateTime << 32)) * 0.0000001;
    }else{
        //  Handle error
        return 0;
    }
}

到目前为止工作正常，程序，排序某些数组（或做一些其他的东西，需要一些时间），它工作正常。但是，当我在这种情况下使用system（）命令时，它不会：

That works fine so far, and when I made a program, that sorts some array (or does some other stuff that takes some time), it works fine. However, when I use the system()-command like in this case, it doesn't:

int main( int argc, const char* argv[] )
{
    double start = get_cpu_time();
    double end;
    system("Bla.exe");
    end = get_cpu_time();

    printf("Everything took %f seconds of CPU time", end - start);

    std::cin.get();

}

给定exe文件的执行在同样的方式，大约需要5秒。当我通过system（）运行它，整个事情需要一个0秒的CPU时间，这显然不包括exe文件的执行。

The execution of the given exe-file is measured in the same way and takes about 5 seconds. When I run it via system(), the whole thing takes a CPU time of 0 seconds, which obviously does not include the execution of the exe-file.

推荐答案

你也可以给外部抽样剖析器一个镜头。我使用免费的困[ http://sleepy.sourceforge.net/]and 更好的非常困[ http://www.codersnotes.com/sleepy/] 分析器

You might also give external sampling profilers a shot. I've used the freebie "Sleepy" [http://sleepy.sourceforge.net/]and even better "Very Sleepy" [http://www.codersnotes.com/sleepy/] profilers under Windows and been very happy with the results -- nicely formatted info in a few minutes with virtually no effort.

有一个类似的项目叫做Shiny[ http://sourceforge.net/projects/shinyprofiler/] 应该在Windows和*

There is a similar project called "Shiny" [http://sourceforge.net/projects/shinyprofiler/] that is supposed to work on both Windows and *nix.

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