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This article mainly introduces "what does Netty Zero copy mean". In daily operation, I believe many people have doubts about what Netty Zero copy means. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful for you to answer the question of "what does Netty Zero copy mean?" Next, please follow the editor to study!

Https://blog.csdn.net/tjreal/article/details/80088139

Netty zero copy is different from ordinary zero copy. Pay attention.

Normal zero copy (kafka):

TransferTo () in FileChannel

An optimized code path for transferring data from the page cache to socket

The page cache in which the operating system reads data from disk into kernel space.

The application reads data from kernel space into the user space cache

The application writes the data back to the kernel space to the socket cache

Copy the buffer to the Nic buffer

Normal copy:

Normal zero copy:

Netty zero copy

Merge multiple ByteBuf into a logical ByteBuf

These ByteBuf exist separately, and the CompositeByteBuf is logically a whole.

In this way, the copy of data is avoided and zero copy is realized.

Use direct memory (non-heap memory)

Zero copy in Netty is entirely in user mode

CompositeByteBuf (mixed buffer)

Normally, after unpacking, you need to merge the package into a buffer, which needs to be copied multiple times.

The Netty file transfer class DefaultFileRegion sends the file to the target Channel through the transferTo method

At this point, the study on "what is the meaning of Netty zero copy" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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