Some only use swap space when the physical memory has already been used.
有些变体仅在已经使用完物理内存时才使用交换空间。
The command displays the total amount of free, used physical, and swap memory in the system, as well as the buffers used by the kernel.
该命令显示系统中的空闲内存、已使用的物理内存和交换内存的总量，以及内核所使用的缓冲区。
The way in which physical memory is used can greatly affect performance.
物理内存的使用方式能够显著地影响性能。
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