tokio (async runtime)

The industry-standard event loop for Rust, providing a multi-threaded scheduler, non-blocking I/O, and timers for high-performance networking.

Tokio serves as the foundational runtime for Rust’s asynchronous ecosystem, powering critical infrastructure like the Hyper HTTP library and the Linkerd service mesh. It delivers a work-stealing scheduler that optimizes CPU utilization across multi-core systems while maintaining sub-microsecond overhead for task spawning. By wrapping system-level APIs (epoll, kqueue, and IOCP) through the Mio crate, Tokio enables developers to handle tens of thousands of simultaneous TCP connections with minimal memory footprints. Its integrated toolset includes specialized primitives for synchronization, filesystem operations, and high-resolution timers (down to millisecond precision) to ensure predictable performance under heavy load.

https://tokio.rs