It's useful to think of the work of m Elixir processes being distributed to n cpu cores by the BEAM scheduler. An Elixir process is not a system process in the way we usually think of the word process if coming from a non-BEAM world.

Sorry for the confusion ; by Elixir process I meant a "unix Elixir process" (aka one command you run), not the lightweight Elixir "Process". The unix Elixir process uses multiple CPUs.