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smilevchy
11/10/2015 - 12:45 PM
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Some Reasons of Poor Performance.md
Some Reasons of Poor Performance.md
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被调用次数太频繁
选择了比较差的算法(algorithm,比如O(n^2) vs O(n))
做了不必要的工作或者频繁做必要工作
数据不好:数据太多或者分布于访问模式太差
clear