You can use some built-in modules: http://erlang.org/doc/efficiency_guide/profiling.html http://erlang.org/doc/efficiency_guide/profiling.html or some external

You can use some built-in modules: http://erlang.org/doc/efficiency_guide/profiling.html http://erlang.org/doc/efficiency_guide/profiling.html or some external tools like recon: https://ferd.github.io/recon/index.html https://ferd.github.io/recon/index.html