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mmap + memcpy
hi buaazp:
我最近在看google的4k视频的一个备份技术的时候。我们使用的是将解码之后的数据放在ion中，然后mmap这个文件节点，然后将数据memcpy到内存的一个地址上。
whatever～～
我们首先使用的是mmap + memcpy，但是不知道做了什么 修改memcpy的使用时间增加了300ms。
copy的数据12M，一开始还是130ms左右，后来到了430ms。我想请问对于这个memcpy时间的增加，性能的下降，您有什么思路吗？一般是什么设置导致的性能的下降呢？
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