文件名称:123
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这段代码把搜索到的记录和第一个记录互换，如果同一个记录连续被访问，那么只用做一次比较，提高了性能。但如果两个记录交互被访问，如1 2 1 2 1 2……，那么性能就会下降了。我们来看一个模拟LRU的代码：
-The code to search for records and records of the first exchange, if a row with a record of being accessed, then just do a comparison, the improved performance. However, if two records interactive visited, such as 121,212 ... ..., then the performance will be dropped. We look at a simulated LRU code:
-The code to search for records and records of the first exchange, if a row with a record of being accessed, then just do a comparison, the improved performance. However, if two records interactive visited, such as 121,212 ... ..., then the performance will be dropped. We look at a simulated LRU code:
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123.txt