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📖 Introduction

gnet is an event-driven networking framework that is fast and lightweight. It makes direct epoll and kqueue syscalls rather than using the standard Go net package and works in a similar manner as netty and libuv, which makes gnet achieve a much higher performance than Go net.

gnet is not designed to displace the standard Go net package, but to create a networking server framework for Go that performs on par with Redis and Haproxy for networking packets handling.

gnet sells itself as a high-performance, lightweight, non-blocking, event-driven networking framework written in pure Go which works on transport layer with TCP/UDP protocols and Unix Domain Socket , so it allows developers to implement their own protocols(HTTP, RPC, WebSocket, Redis, etc.) of application layer upon gnet for building diversified network applications, for instance, you get an HTTP Server or Web Framework if you implement HTTP protocol upon gnet while you have a Redis Server done with the implementation of Redis protocol upon gnet and so on.

gnet derives from the project: evio while having a much higher performance and more features.

🚀 Features

• High-performance event-loop under networking model of multiple threads/goroutines
• Built-in goroutine pool powered by the library ants
• Built-in memory pool with bytes powered by the library bytebufferpool
• Lock-free during the entire runtime
• Concise and easy-to-use APIs
• Efficient and reusable memory buffer: Ring-Buffer
• Supporting multiple protocols/IPC mechanism: TCP, UDP and Unix Domain Socket
• Supporting multiple load-balancing algorithms: Round-Robin, Source-Addr-Hash and Least-Connections
• Supporting two event-driven mechanisms: epoll on Linux and kqueue on FreeBSD/DragonFly/Darwin
• Supporting asynchronous write operation
• Flexible ticker event
• SO_REUSEPORT socket option
• Built-in multiple codecs to encode/decode network frames into/from TCP stream: LineBasedFrameCodec, DelimiterBasedFrameCodec, FixedLengthFrameCodec and LengthFieldBasedFrameCodec, referencing netty codec, also supporting customized codecs
• Supporting Windows platform with event-driven mechanism of IOCP Go stdlib: net
• Implementation of gnet Client

📊 Performance

Benchmarks on TechEmpower

# Hardware Environment
CPU: 28 HT Cores Intel(R) Xeon(R) Gold 5120 CPU @ 2.20GHz
Mem: 32GB RAM
OS : Ubuntu 18.04.3 4.15.0-88-generic #88-Ubuntu
Net: Switched 10-gigabit ethernet
Go : go1.14.x linux/amd64

This is the top 50 on the framework ranking of all programming languages consists of a total of 422 frameworks from all over the world where gnet is the runner-up.

This is the full framework ranking of Go and gnet tops all the other frameworks, which makes gnet the fastest networking framework in Go.

To see the full ranking list, visit TechEmpower Plaintext Benchmark.

Contrasts to the similar networking libraries

On Linux (epoll)

Test Environment

# Machine information
        OS : Ubuntu 18.04/x86_64
       CPU : 8 Virtual CPUs
    Memory : 16.0 GiB

# Go version and configurations
Go Version : go1.12.9 linux/amd64
GOMAXPROCS=8

Echo Server

HTTP Server

On FreeBSD (kqueue)

Test Environment

# Machine information
        OS : macOS Mojave 10.14.6/x86_64
       CPU : 4 CPUs
    Memory : 8.0 GiB

# Go version and configurations
Go Version : go version go1.12.9 darwin/amd64
GOMAXPROCS=4

Echo Server

HTTP Server

🏛 Website

Please visit the official website for more details about architecture, usage and other information of gnet.

⚠️ License

Source code in gnet is available under the MIT License.

👏 Contributors

Please read the Contributing Guidelines before opening a PR and thank you to all the developers who already made contributions to gnet!

⚓ Relevant Articles

• A Million WebSockets and Go
• Going Infinite, handling 1M websockets connections in Go
• Go netpoll I/O 多路复用构建原生网络模型之源码深度解析
• gnet: 一个轻量级且高性能的 Golang 网络库
• 最快的 Go 网络框架 gnet 来啦！
• 字节跳动在 Go 网络库上的实践

🎡 User cases

Please feel free to add your projects here~~

🔋 JetBrains OS licenses

gnet had been being developed with GoLand IDE under the free JetBrains Open Source license(s) granted by JetBrains s.r.o., hence I would like to express my thanks here.

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