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To understand the reverse mapping technique, let's quickly go through some fundamentals of the Linux virtual memory system.
为了理解反向映射技术，让我们来首先简单了解Linux虚拟内存系统的一些基本原理。
The whole point of a virtual memory system is that you can have a virtual address space that's much bigger than the amount of physical memory on the computer.
一个虚拟内存系统的全部重点就是：你可以拥有一个虚拟的地址空间，它比计算机上的物理内存总量还要大。
Experimental results show that this method extends the problem sizes that can be efficiently solved and its performance is better than the virtual memory system while the data set is large.
实验结果表明，该方法扩展了可有效解决的核外问题规模，大数据量时的计算性能优于虚存系统。
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