虽然我们可以通过启用系统监视器来简单观察内存的使用量，但是它不会告诉我们比整个系统内存状态更有用的任何内容。
While we can simply watch the amount of memory used by a script by turning the system monitor on, it will not tell us anything more useful than the status of the entire system memory.
一个Screen会话正在运行(尽管看不到)，窗口A处于活动状态，它正在运行系统监视器top，每隔几秒刷新一次系统性能信息。
A Screen session is running (albeit unseen), and window a is active, running the top system monitor, which refreshes system performance information every few seconds.
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