[ihuk]

That's just not true. Before you would run into all kinds of bottlenecks after 2-4 cores. I believe it was addressed in R13A[1].

[1] http://erlang.org/download/otp_src_R13A.readme

[lelf]

Not after 2-4 cores. And R13A is 2009, that was 10 years ago. (Java 8 is 2014.)

Today’s Erlang (R22) MP support is practically the best, bar none.

[ihuk]

Hence the past tense.