It depends? It's easy in Ocaml to fork child processes, set up pipes, and pass messages back and forth. There are libraries that paper over the details (or you

It depends? It's easy in Ocaml to fork child processes, set up pipes, and pass messages back and forth. There are libraries that paper over the details (or you can roll your own, as I suspect many of us have done over the years). That approach is not suitable for every workload, but fine for most map/reduce applications.