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We're working on it. You can install and play around with Multicore compiler today though the wider library ecosystem is yet to catch up. https://github.com/ocamllabs/ocaml-multicore

Multicore support is imho nowhere near OCaml's top problem :-) that would probably be a toolchain that lends itself to easy reproducible package management. But we're getting there.

It's even great to draw nice fractals: https://github.com/cedricbonhomme/iterated-function-systems ;-)

Not everything needs to be usable for a Web server. I also wouldn't use C or C++ for anything directly plugged into the network. Morris worm proved what happens 30 years ago.

Besides, there are also multiple processes as possible solution.