The rate of page cleaning, or the total absence of it, can cause large differences in timings which can make performance comparisons misleading.
页清除率，或者说总缺页率，可能导致计时上的很大不同，使得性能比较容易产生误解。
The performance of the individual component timings can be extracted, graphed, and viewed over time.
可以提取各个组件的计时性能数据并绘制图表，以及观察随时间推移的变化趋势。
JUnit timings reporting how long each test case takes to run will give an idea of where any performance problems lie.
JUnit计时结果报告了每个测试用例运行了多长时间，这将将我们对任何性能问题的方位有一个大致判断。
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