Caution: Requires large amount of memory and swap memory.
注意：需要大量的内存和交换分区。
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 display changes when you swap memory pages so you need not copy an Image object from program memory to video memory; you merely change video Pointers and the display changes.
当交换内存页时显示就发生更改，所以您不需要将Image对象从程序内存复制到显示内存；您只要更改视频指针，显示就会发生更改。
The display changes when you swap memory pages so you need not copy an Image object from program memory to video memory; you merely change video Pointers and the display changes.
当交换内存页时显示就发生更改，所以您不需要将Image对象从程序内存复制到显示内存；您只要更改视频指针，显示就会发生更改。
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