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The demo of uiaTutorial_1_StellarisLM4F232H5QD worked wrong?

I run  the demo of uiaTutorial_1_StellarisLM4F232H5QD with LM4F232H5QD  eval board .  

demo tutorial_1B:benchmark your application code so that you can see how long it takes to execute code on a running system

I found the time don't change! why?