In Erlang, F(G(X)) is used for small steps. Pipes are used for big steps. The big steps semantics is processes. It's messages between processes. Proc… - Joe Armstrong

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In Erlang, F(G(X)) is used for small steps. Pipes are used for big steps. The big steps semantics is processes. It's messages between processes. Processes are used for big computation. When you got F(G(X)) is a small step, and we map small steps on the same core. We map big steps on processes. Processes map on multi-core. The system just does it for you.