擅长:python、mysql、java
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<p>This code snippet is from shutil.py</p>
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<p>这是一个标准的库模块。为什么不直接用呢?在</p>
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<p>First, it means that with each call of read() a new memory chunk is allocated and when buf is overwritten in the next iteration this memory is freed, only to allocate new memory again for the same purpose. This can slow down the whole process and put unnecessary load on the host.</p>
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<p>与从磁盘上实际获取一页数据所需的工作量相比,这是微不足道的。在</p>