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    <p>The example of parallelized server that you cite is one of those embarassingly parallel problem that are well solved with a simple multiprocessing model, using <code>fork</code>. This has been doable in OCaml for decades, and yes, you will an almost linear speedup using all the cores of your machine if you need.</p> <p>To do that using the simple primitives of the standard library, see <a href="http://ocamlunix.forge.ocamlcore.org/processes.html" rel="noreferrer">this Chapter</a> of the online book "Unix system programming in OCaml" (first released in 2003), and/or <a href="http://caml.inria.fr/pub/docs/oreilly-book/html/book-ora187.html" rel="noreferrer">this chapter</a> of the online book "Developing Applications with OCaml" (first released in 2000).</p> <p>You may also want to use higher-level libraries such as Gerd Stolpmann's <a href="http://projects.camlcity.org/projects/ocamlnet.html" rel="noreferrer">OCamlnet</a> library mentioned by rafix, which provides a lot of stuff from direct helper for the usual client/server design, to lower-level multiprocess communication libraries; see <a href="http://projects.camlcity.org/projects/dl/ocamlnet-3.6.3/doc/html-main/index.html" rel="noreferrer">the documentation</a>.</p> <p>The library <a href="https://github.com/rdicosmo/parmap" rel="noreferrer">Parmap</a> is also interesting, but maybe for slightly different use case (it's more that you have a large array of data available all at the same time, that you want to process with the same function in parallel): a drop-in remplacement of <code>Array.map</code> or <code>List.map</code> (or <code>fold</code>) that parallelizes computations.</p>
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    1. POWhat libraries should I use for better OCaml Threading?
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    1. COOk, so if we can use `fork` in this kind of scenario, why `lwt` or `async_core` exist? I mean what are the differences between them and `fork`? Are `lwt` or `async_core` multi-core enabled?
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    2. COJackson i've answered the last question already
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    3. CO@rgrinberg I was confused by your answer, sorry, maybe it is because I really don't understand what is `thread` now. From my understanding from Java world, `threading` was born with the ability to utilise multi-cpu. But from your answer or from what I have read some documents so far, it is not.
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