代码说明： 计算执行一个测试函数的处理器周期数，这是一个执行算法的好的方法，因为它独立于cpu的速度 What the component do is to count the number of processor cycles used to executed a test function. This is a good way of profiling algorithms because it is independent to the speed of the processor. The component uses a Pentium instruction RDTSC that read a counter (pentium time stamp counter) containing the number of cycles executed since power up.

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