# monoio-rs/monoio

Rust async runtime based on io-uring.

Repository: https://github.com/monoio-rs/monoio
Canonical: https://ross.abutalabs.com/products/monoio
Language: Rust
License: Apache-2.0
License Family: permissive
Last push: 2026-07-20T12:52:37+00:00

## Health v2 (maintenance only)
Score: 65/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 93, release rhythm 8, longevity 100
- inputs: {"age_days": 1737, "days_push": 44, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 5081, forks 295 (observed 2026-08-28T04:09:09.561259+00:00)

## What it is
Monoio is a thread-per-core asynchronous Rust runtime built on io_uring (with epoll/kqueue fallbacks), originally developed at ByteDance. Unlike Tokio-uring, it runs standalone rather than atop another runtime, and its thread-per-core model removes the need for Send/Sync bounds on tasks.

## Use cases
- build a high-performance network server in Rust
- write a load balancer like NGINX with thread-per-core architecture
- maximize throughput for io-bound socket workloads
- avoid Send/Sync constraints on async tasks
- use io_uring for native async I/O on Linux

## When to choose
- you are building io-bound network servers on Linux with kernel 5.6+
- you want thread-per-core semantics and thread-local data without sharing across threads
- you need better performance than Tokio for your specific server workloads

## When to avoid
- you need a general-purpose runtime with work-stealing and cross-thread task migration
- you require broad ecosystem compatibility with Tokio-based crates
- your target platform lacks io_uring and you need Windows support
- you want to avoid nightly/unstable Rust features

## Facets
- artifact type: library
- maturity: active
- function: concurrency, http-server, networking
- domain: developer-tools, backend, performance, microservices
- platform: rust
- tags: async-runtime, io-uring, thread-per-core, epoll, kqueue, linux, macos

## Member repositories
- monoio-rs/monoio (main) score 65

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:09.561259+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 2026-08-29T18:02:34.640378+00:00, confidence not recorded.
  - readme: https://github.com/monoio-rs/monoio (fetched 2026-08-28T04:09:09.561259+00:00, sha d370a754b5c1)
- Data as of 2026-08-30T08:39:29.467469+00:00.