Nuclei is a proactor-based IO system which is runtime agnostic and can work with any runtime. The proactor system's design principles are matching Boost Asio. Nuclei is not using a conventional reactor approach. It is completely asynchronous, and it's wrapping poll based IO in a proactive fashion.

Nuclei uses io_uring on Linux as the primary IO backend, secondarily you can use epoll. On MacOS, Nuclei is using kqueue. On Windows, the IOCP backend will be used.

The current io_uring implementation needs a modern Linux kernel (5.19+).

• Most of the recent IO_URING features are available, ZC and other 6.1+ features are in TODO.
• Async TCP, UDP, Unix domain sockets and files...
• The proactor system doesn't block
• Scatter/Gather operations
• Minimal allocation
• More expressive than any other runtime
• Completely asynchronous I/O system with lock free programming

Please head to examples directory to run the examples:

$ cd examples
$ cargo run --example fread-vect

$ cargo test --no-default-features --features=iouring # For iouring
$ cargo test # For others

When the iouring feature gate is not enabled, the platforms evented backend is used. For example, on Linux, epoll would be used.

Executor is using async-global-executor. Available features are:

• async-exec: Uses async-io feature of async-global-executor.
• tokio
• tokio02
• tokio03

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