tokio-rs/mio

Health v2 · maintenance only

Adoption not part of the score

7109 stars · 877 forks observed · 2026-10-01

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Mio is a fast, low-level I/O library for Rust providing non-blocking APIs and OS event notification (epoll, kqueue, IOCP) for building high-performance networked applications. It is the foundation layer underneath Tokio and other async runtimes.

Use cases

• build a high-performance non-blocking TCP server in Rust
• write a custom event loop over epoll/kqueue/IOCP
• implement an async runtime or executor from scratch
• handle thousands of concurrent sockets with minimal overhead
• wrap OS I/O readiness events in a portable API

When to choose

• you need maximum I/O performance with minimal abstraction overhead
• you are building your own async runtime or low-level networking library
• you want direct, portable access to OS readiness events

When to avoid

• you want an easy high-level async API - use Tokio instead
• you need blocking I/O or simple synchronous networking
• you want built-in tasks, timers, or channels - Mio only provides event notification

Facets

library · maturity stable

networking concurrency developer-tools networking developer-tools performance rust windows cross-platform non-blocking-io event-loop epoll kqueue iocp async-runtime-foundation linux macos

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markdown · JSON · MCP: product_card(name="tokio-rs/mio")