Windows操作系统中是否存在零拷贝? [英] Does Zero-copy exist in Windows OS?

问题描述

阅读此零拷贝文章，

Windows OS(服务器2003、2008、2008 R2)中是否存在零拷贝?

Does Zero-copy exist in Windows OS (server 2003, 2008, 2008 R2) ?

推荐答案

是的，它通过

Yes, it is supported via the TransmitFile API.

我非常确定IIS也使用此功能.

I'm pretty sure that IIS uses this as well.

该方法是否进行真正的零复制(即甚至不从文件缓冲区复制到套接字缓冲区)都没有在文档中明确提及.但是考虑到该方法的定义方式使得绝对成为可能，如果不是这种情况，我会感到非常惊讶.

Whether or not this method does real zero-copy (i.e. doesn't even copy from the file buffers to the socket buffers) is not explicitly mentioned in the documentation. But given the fact that this method is defined in a way that definitely makes it possible, I'd be highly surprised if this were not the case.

最接近文档说明的是本段:

The closest the documentation comes to stating it clearly is this paragraph:

[...] TransmitFile通过直接从文件缓存发送数据来提高性能.

[...] TransmitFile achieves its performance gains by sending data directly from the file cache.

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