4 ms·

Async is running many tasks on many less threads, using polling. See https://rust-lang.github.io/async-book/01_getting_started/02_why_async.html https://rust-l

• steveklabnik 5y ago
  (but note that this doesn't mean busy-loop polling, while that will be used in "my first executor" tutorials, production executors don't call a future until it's ready to have more progress made via an event, often from an epoll/kqueue/iocp or similar mechanism.)
  • bruce343434 5y ago
    this sounds like a lot of overhead, though
    • DenseComet 5y ago
      Rather, Rust just makes this overhead explicit. Go, Node, etc do the same thing, but just hide what actually happens.
    • Groxx 5y ago
      It is, relative to not doing it. But it's quite a lot less overhead than a native thread.
    • chmod775 5y ago
      As opposed to what?