Fast event-loop networking for #golang

Evio is an event loop networking framework that is fast and small. It makes direct epoll and kqueue syscalls rather than using the standard Go net package, and works in a similar manner as libuv and libevent.

The goal of this project is to create a server framework for Go that performs on par with Redis and Haproxy for packet handling. My hope is to use this as a foundation for Tile38 and a future L7 proxy for Go… and a bunch of other stuff.

Just to be perfectly clear

This project is not intended to be a general purpose replacement for the standard Go net package or goroutines. It’s for building specialized services such as key value stores, L7 proxies, static websites, etc.

You would not want to use this framework if you need to handle long-running requests (milliseconds or more). For example, a web api that needs to connect to a mongo database, authenticate, and respond; just use the Go net/http package instead.

There are many popular event loop based applications in the wild such as Nginx, Haproxy, Redis, and Memcached. All of these are single-threaded and very fast and written in C.

The reason I wrote this framework is so I can build certain network services that perform like the C apps above, but I also want to continue to work in Go.


  • Fast single-threaded event loop
  • Simple API
  • Low memory usage
  • Supports tcp4, tcp6, and unix sockets
  • Allows multiple network binding on the same event loop
  • Flexible ticker event
  • Fallback for non-epoll/kqueue operating systems by simulating events with the net package
  • Ability to wake up connections from long running background operations

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