Regarding the multicore thing it had been answered already: if you have to run a distributed service in a 8 cores machine then just run 8 binaries. If you are u

Regarding the multicore thing it had been answered already: if you have to run a distributed service in a 8 cores machine then just run 8 binaries. If you are using threads to write more elegant synchronous-like code in replacement of even driven asynchronous io then you do not need a concurrent runtime for that. Now, regarding the availability of libraries to build distributed system in ocaml you are totally right. For years it seams everybody was happy with mpi, then we had some sort of map reduce framework, and that's it as far as I'm aware. I would expect the growing popularity of mirage OS to improve this situation, though.