Eio 1.0 – Effects-based IO for OCaml 5
summary
Effects-based direct-style IO for OCaml 5 that exposes three core effects suspend, fork, get_context and multiple backends (POSIX, Linux io_uring, Windows, JS, Solo5). Claims: single-core read benchmark runs in 0.38s vs 1.49s (~4x) compared with Lwt; lock-free synchronization improves multicore throughput; resource lifetimes handled by switches to avoid cancellation leaks. Bridges let Eio interoperate with Lwt, Async and Domainslib; real ports include the OCaml CI solver (68 target platforms, port halved LOC) and several libraries; OCaml 5.1 event tracing and a Meow-style monitor are pending.
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chapters (13)
- 0:00Introduction to Eio
- 0:28Motivation for Eio
- 1:32Eio Architecture
- 2:35Eio Backends
- 4:04Performance and Benchmarks
- 5:23Interoperability with LWT
- 7:30Async and Other Libraries
- 8:58Resource Management
- 10:06Capabilities and Security
- 12:27Porting Experiences
- 14:01Porting Strategies
- 15:47Future Work and Community
- 17:17Q&A
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