与直接访问RAM中的内存块相比，把内存块交换到磁盘并交换回来要慢得多，所以一般情况下应该避免这种做法。
Paging a memory block out and back in from disk is significantly slower than accessing it directly from RAM, so you should generally avoid this practice.
总的移动时间是直接成比例的内存交换数量。
The total transfer time is directly proportional to the amount of memory swapped.
在主机内部直接与CPU交换信息的存储器成为内存或主存。
In the mainframe, memory that directly transit information with CPU is referred to as internal memory or primary storage.
在主机内部直接与CPU交换信息的存储器成为内存或主存。
In the mainframe, memory that directly transit information with CPU is referred to as internal memory or primary storage.
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