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I believe Java's NIO library will use epoll on Linux machines. What are all the advantages of using Epoll instead of NIO on Linux machines.
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Netty's epoll transport uses epoll edge-triggered while java's nio library uses level-triggered. Beside this the epoll transport expose configuration options that are not present with java's nio like TCP_CORK, SO_REUSEPORT and more.
Netty supports the use of native-epoll-connection by adding an optional dependency. If the driver is not present, Netty will fallback to using NIO instead of the native protocol .
Netty's epoll transport uses epoll edge-triggered while java's nio library uses level-triggered. Beside this the epoll transport expose configuration options that are not present with java's nio like TCP_CORK, SO_REUSEPORT and more.
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There are some information about this in netty's docs:
Netty provides the following platform specific JNI transports:
Linux (since 4.0.16) MacOS/BSD (since 4.1.11)These JNI transports add features specific to a particular platform, generate less garbage, and generally improve performance when compared to the NIO based transport.
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