SMP Erlang DOES use threads, it then uses green-processes and a custom scheduler to schedule processes fairly and preemptively across those threads. It doesn't

SMP Erlang DOES use threads, it then uses green-processes and a custom scheduler to schedule processes fairly and preemptively across those threads. It doesn't use like 1 thread per process, but threads are a key component of how it works. It is absolutely nothing like spawning OS level processes. They are micro-processes, green-processes than live inside the Erlang VM.