已经使用了的常驻内存 Resident size
有些变体仅在已经使用完物理内存时才使用交换空间。
Some only use swap space when the physical memory has already been used.
尽管这个命令提供一些有价值的信息，但是除非有可信的管理员已经诊断出系统中存在某种内存问题，否则我们通常不会首先使用这个命令。
While this command provides useful information, we don't usually start with this unless a trusted administrator has already diagnosed that there is a memory issue of some kind on the system.
由于可用的图形内存通常比通用内存更有限，所以已经对呈现过程进行了优化，将图形内存的使用控制在最小。
As available graphics memory is usually far more limited than general memory, the rendering process has been optimized to keep the use of graphics memory to a minimum.
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