The OCaml 5 update brought much-anticipated support for programming on multiple cores. It also introduced support for concurrency via effect…

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Eio 1.0 is a new effects-based I/O library for OCaml 5 that provides improved performance and security. It features a direct-style I/O stack, support for concurrency via effect handlers, and compatibility with modern kernel I/O advancements. The release focuses on performance and security, with optimizations for parallelism efficiency and distinct high-level and low-level interfaces. Eio differentiates itself from predecessors like Async and Lwt by using effect handlers, which enable natural direct-style coding for asynchronous I/O. The post also discusses the history of Eio, its main features, and plans for future iterations.

Eio 1.0 Release: Introducing a new Effects-Based I/O Library for OCaml