clock测试程序运行时间问题。

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？

Shine：

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();