The difference between Tokio tasks and OS threads

Stop treating tokio::spawn as a thread! I launched 1000 tasks in 2 seconds and the system stayed calm

Follow Rexai Programming on WeChat to learn Rust the easy way. Forget the heavy “thread” mental model from your OS class. Today, I’ll show you a delightful trick about Tokio. You think tokio::spawn creates a thread? Nope. It gives you something smarter, lighter, and frankly a little sneaky: the ability to harness massive concurrency at a shockingly low cost. This is one of Rust’s secret weapons in backend development. Ready? Let’s reveal the trick. ...

August 11, 2025 · 4 min · 818 words · Rexai Programming