> Wait, async is multithreaded by default in Rust? For me the whole point of using async in JavaScript or Python (originally with Twisted's @inlineCallbacks) w

> Wait, async is multithreaded by default in Rust? For me the whole point of using async in JavaScript or Python (originally with Twisted's @inlineCallbacks) was to get concurrency without threads. Async in rust is nothing by default because it doesn't have a runtime. You need to use a runtime/executor for async to work, the most popular being Tokio, which can be configured to be single-threaded or multi-threaded. EDIT: But in a way since Rust make 0 assumption about how async function are going to be executed, it does design around the fact that they might be multi-threaded.