页清除率，或者说总缺页率，可能导致计时上的很大不同，使得性能比较容易产生误解。
The rate of page cleaning, or the total absence of it, can cause large differences in timings which can make performance comparisons misleading.
最后把置换算法进行了综合性性能分析，如何才能把缺页率保持在一个合理的水平上。
Finally, the comprehensive performances of displacement algorithms are analyzed, and the method of keeping the rate of missing pages on a reasonable level is obtained.
增加这个缓冲区的大小允许系统映射更多的虚拟内存，其结果是使得使用大量虚拟内存的应用程序(如Oracle)的缺页率更低。
Increasing the size of this buffer allows the system to map more virtual memory, which results in a lower miss rate for applications that use a lot of virtual memory like Oracle.
增加这个缓冲区的大小允许系统映射更多的虚拟内存，其结果是使得使用大量虚拟内存的应用程序(如Oracle)的缺页率更低。
Increasing the size of this buffer allows the system to map more virtual memory, which results in a lower miss rate for applications that use a lot of virtual memory like Oracle.
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