The Tprof tool is a timer profiler that identifies what code is running on the CPU during a user-specified time interval.

Tprof 工具是一个计时器剖析器，可以识别出在用户指定的一个时间间隔内哪些代码在 CPU 上运行。

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The optimized code is now running faster than the non-optimized code, which you can see by comparing the interval times of each run.

现在优化的代码比未优化的代码运行速度更快，您可以通过比较每次运行的时间间隔看到这一点。

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Note that you can extend the code shown in Listing 3 to allow additional management operations, such as stopping or modifying the interval between successive message transfers.

注意，可以扩展清单3的代码来加入更多的管理操作，例如停止消息传递或修改成功消息传递之间的时间间隔。

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By reading the encrypted data off of two cards and testing thousands of potential site codes against both cards until the decoded data displays a predictable interval between the two, he can find the site code and use it to create more card keys with a magnetizing device.

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