Async IO

io_uring

Ringing in a new asynchronous I/O API & The rapid growth of io_uring

  • Map a program’s IO buffers into the kernel; this prevents repeated mapping / unmapping.
  • https://github.com/tokio-rs/io-uring exists
  • Completions can be delivered or polled for. A fully-polled mode that lasts “forever” OR until one full idle second. The kernel will maintain a polling thread that delivers completions.

While the kernel has had support for asynchronous I/O (AIO) since the 2.5 development cycle, it has also had people complaining about AIO for about that long.

  • What about epoll? How is AIO different from epoll?
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