# tidwall/evio

Fast event-loop networking for Go

Repository: https://github.com/tidwall/evio
Canonical: https://ross.abutalabs.com/products/evio
Language: Go
License: MIT
License Family: permissive
Topics: networking
Last push: 2026-05-19T13:29:02+00:00

## Health v2 (maintenance only)
Score: 70/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 83, release rhythm 35, longevity 100
- inputs: {"age_days": 3347, "days_push": 106, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 6040, forks 492 (observed 2026-08-28T04:09:34.542369+00:00)

## What it is
evio is a fast, small event-loop networking framework for Go that makes direct epoll and kqueue syscalls instead of using the standard net package, similar to libuv and libevent. It provides a simple event-driven API for building high-performance TCP, UDP, and Unix socket servers.

## Use cases
- build a high-performance TCP server in Go
- write a Redis-like packet-handling server
- create a low-latency UDP server
- implement a custom L7 proxy
- handle thousands of concurrent connections with low memory
- build an echo or protocol server with an event loop

## When to choose
- you need performance on par with Redis or HAProxy for packet handling
- you want direct epoll/kqueue event-loop networking instead of Go's net goroutine-per-connection model
- you're building a custom protocol server, proxy, or network foundation
- low memory usage per connection is critical

## When to avoid
- you need a drop-in replacement for net or net/http
- you're building a standard HTTP/REST API where net/http is sufficient
- your team is unfamiliar with event-loop programming and callback-style APIs
- you rely on features of the standard library like HTTP middleware ecosystems

## Facets
- artifact type: library
- maturity: stable
- function: http-server, networking, concurrency
- domain: networking, backend, performance, developer-tools
- platform: go, cross-platform
- tags: event-loop, epoll, kqueue, tcp, udp, unix-sockets, high-performance, non-blocking-io, linux, macos

## Member repositories
- tidwall/evio (main) score 70

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:34.542369+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:48:58.237313+00:00, confidence not recorded.
  - readme: https://github.com/tidwall/evio (fetched 2026-08-28T04:09:34.542369+00:00, sha 3c242148cb81)
- Data as of 2026-08-30T08:39:29.467469+00:00.