Erlang OTP is a complex system. It can be a bit hard to find out where to look if you want to know the details of some implementation. This page is a simple routemap to the interesting parts of the Erlang OTP source code. With ‘interesting’ I mean for users who are interested in the internal workings of Erlang for example for performance reasons and networking.
Erlang Run-Time System Application.This tree includes the virtual machine, the garbage collector, and the port mapper daemon. The documentation about ERTS shows that erl_driver, erl_nif, zlib, epmd, erl and erlang all belong to this basic application.
Erlang’s Beam VM: contains .c and .h files such as:
Erlang’s native code compiler. Interaction between Beam and Native code
Contains the Erlang libraries. That means: lots of files written in Erlang code to implement lots of functions you use every day.
Note: feel free to edit and point out more interesting parts of the source code.