[sinancepel]

You can have multi-threaded OCaml (our server actually has two threads), but only one can run at a time currently. We solve this problem by having a multi-process architecture where workers only communicate through a lock-free hash table in shared memory.

[leshow]

Is it fair to say that it runs in parallel if only one thread may run at a time? Isn't that concurrent, but not parallel?

[platinumrad]

Both responses to your original question mention that multiple processes are run.