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clock测试程序运行时间问题。

Lisong Xu
Prodigy 20 points


程序是在omapl138中的dsp6748中运行的

 start = clock ();

 stop = clock ();

 overhead = stop - start ;

 start = clock ();

 ...(test code)

 stop = clock ();

 cycles = stop - start - overhead;

现在发现clock的返回值总是0，

这个事什么原因？

  • 0
    TI__Guru**** 357097 points

    试试下面的代码

    LgUns time1, time2, timediff;

    Float CPUcycles;

    // benchmarking the process() DSP call

    time1 = CLK_gethtime();

       ....stuff to be benchmarked...

    time2 = CLK_gethtime();

    CPUcycles = time2-time1;

    timediff = CPUcycles / CLK_countspms();