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ocaml-multicore
eio
OCaml2021–2026
ocaml-multicore / eio

eio

Effects-based direct-style IO for multicore OCaml

Systems & Infrastructure
Explore on GitHubRead Hacker News discussions
11Distinct people
19Mentions
0Explicit recommenders
742GitHub stars
REPOSITORY AT A GLANCE

What to know before exploring

What it is

Effects-based direct-style IO for multicore OCaml

GitHub

Where it is used

No documented product use was verified in the last source check.

What people are saying

No recommendation phrase was found in the indexed comments.

No classified warning is attached to this page. Read the discussions before treating silence as approval.

Also in these discussions

No other repository is repeatedly linked in the same discussions.

This week on Hacker News

Nov 8–Nov 15 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/15/2026, 2:59:58 PM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by year19 dated mentions

Observed mentions: 2021-03-11 16:42:12 UTC to 2026-05-15 14:08:14 UTC.

02468102021-01-01 00:00:00 UTC to 2022-01-01 00:00:00 UTC (exclusive): 5 mentions; 0 submissions, 5 comments20212022-01-01 00:00:00 UTC to 2023-01-01 00:00:00 UTC (exclusive): 9 mentions; 0 submissions, 9 comments2023-01-01 00:00:00 UTC to 2024-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments20232024-01-01 00:00:00 UTC to 2025-01-01 00:00:00 UTC (exclusive): 2 mentions; 0 submissions, 2 comments2025-01-01 00:00:00 UTC to 2026-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2026-01-01 00:00:00 UTC to 2027-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments. Incomplete calendar period.2026*

* An incomplete calendar period is marked with an outlined bar. Its count is not directly comparable with a full period.

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges
UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
PeriodStart (UTC)End (exclusive, UTC)MentionsSubmissionsComments
20212021-01-01 00:00:00 UTC2022-01-01 00:00:00 UTC505
20222022-01-01 00:00:00 UTC2023-01-01 00:00:00 UTC909
20232023-01-01 00:00:00 UTC2024-01-01 00:00:00 UTC101
20242024-01-01 00:00:00 UTC2025-01-01 00:00:00 UTC202
20252025-01-01 00:00:00 UTC2026-01-01 00:00:00 UTC101
2026 (partial)2026-01-01 00:00:00 UTC2027-01-01 00:00:00 UTC101

What Hacker News says

1 sources
avsm·May 15, 2026
Nice work! Did you ever open any open source any of it? Looking at your OCaml wishlist from back in 2017, some stuff has improved and some is on its way: - Support for read-only BigArrays (or sections) : we're starting to switch to just using bytes/string in OCaml 5+ now, since the larger allocations go into malloc'ed pools and do not relocate, so they can be used as part of an FFI (without the Bigarray C value overhead) - More support for floating-point numbers (exceptions, representation exploration): OxCaml has some of this now! https://oxcaml.org/documentation/miscellaneous-extensions/sm... - Syntax for extended BigArray indexing: now supported in OCaml https://ocaml.org/manual/5.4/indexops.html#ss:multiindexing - LaCaml remains too low-level (non-functional) and unreadable: still remains the case, but OxCaml's got initial support fo
Read the rest
r SIMD https://oxcaml.org/documentation/simd/intro - BigArray and floating-point I/O remains difficult (we would like: I/O to channels, efficient representation retrieval): much easier now with OCaml effects to build custom fast serialisers (see https://github.com/ocaml-multicore/eio) - Native top-level: ocamlnat is (I think) shipped in OxCaml, but you can also run a wasm toplevel
In O(x)Caml in Space

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