multicore is still getting developed. you can watch the repo at https://github.com/ocaml-multicore/ocaml-multicore
> use algebraic effects to compose concurrency and supports parallelism through domains and incremental GC. Rather than adding a specific multicore scheduler into the runtime system, we’re providing the minimum required toolset in the form of pluggable schedulers.
Care to elaborate?
Sure, but at the end of the day what it means is 5 years into the effort OCaml still as limited threading-wise as it was at the start of the effort. And that is what most users (and non-users) care about in a world where 2/4 is your mobile baseline and where AMD's R3-3300G is expected to be 6/12 for $99.