我怎样才能基准C $ C $Ç容易吗？ [英] How can I benchmark C code easily?

问题描述

有一个简单的库，以基准它需要执行C code的一部分的时候？我想是这样的：

Is there a simple library to benchmark the time it takes to execute a portion of C code? What I want is something like:

int main(){
    benchmarkBegin(0);
    //Do work
    double elapsedMS = benchmarkEnd(0);

    benchmarkBegin(1)
    //Do some more work
    double elapsedMS2 = benchmarkEnd(1);

    double speedup = benchmarkSpeedup(elapsedMS, elapsedMS2); //Calculates relative speedup
}

这也将是巨大的，如果图书馆让你做很多奔跑，它们平均和定时计算方差！

It would also be great if the library let you do many runs, averaging them and calculating the variance in timing!

推荐答案

基本上，你想要的是一个高分辨率计时器。经过时间当然只是在时间差和所述加速是通过将时间为每个任务计算。我已经包括了code为高分辨率计时器应该至少Windows和UNIX上工作。

Basically, all you want is a high resolution timer. The elapsed time is of course just a difference in times and the speedup is calculated by dividing the times for each task. I have included the code for a high resolution timer that should work on at least windows and unix.

#ifdef WIN32

#include <windows.h>
double get_time()
{
    LARGE_INTEGER t, f;
    QueryPerformanceCounter(&t);
    QueryPerformanceFrequency(&f);
    return (double)t.QuadPart/(double)f.QuadPart;
}

#else

#include <sys/time.h>
#include <sys/resource.h>

double get_time()
{
    struct timeval t;
    struct timezone tzp;
    gettimeofday(&t, &tzp);
    return t.tv_sec + t.tv_usec*1e-6;
}

#endif

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