I have just merged tried the ARM JIT PR (jit: Add support for 64-bit ARM processors by jhogberg · Pull Request #4869 · erlang/otp · GitHub) into the OTP 24.1.3 release, which gives me OTP 24 + JIT on ARM

You can try it out with the following (using ASDF):

export OTP_GITHUB_URL="https://github.com/qdentity/otp"
asdf install erlang ref:v24.1.3
asdf local erlang ref:v24.1.3

Running the snippet from https://twitter.com/akoutmos/status/1453558037063639040

{time, _} = :timer.tc(fn -> 1..5_000_000 |> Enum.reduce(0, fn number, acc -> acc + number end) end)
System.convert_time_unit(time, :microsecond, :millisecond)

finishes in 1s, which is very nice compared to the 1.7s the AMD Ryzen 9 3950X in the tweet achieved! Someone also ran it with the OTP 25 development branch and achieved the same same result (1s).

Other improvements to mention here: full recompile on a large project:

37 seconds (Macbook Pro 2017 best i7)
vs
23 seconds (Macbook Pro M1 16 inch 10-core)

Partial recompile on same project (recompiling 42 files):

17 seconds (Macbook Pro 2017 best i7)
vs
5 seconds (Macbook Pro M1 16 inch 10-core)

Overall, very nice speed-ups

For anyone that comes by later, you can dramatically speed up compilation times by either:

1. Using the Homebrew version of Erlang
2. Using the KERL_CONFIGURE_OPTIONS from the Homebrew formula.

I used:

export KERL_CONFIGURE_OPTIONS="
      --disable-debug \
      --disable-silent-rules \
      --enable-dynamic-ssl-lib \
      --enable-hipe \
      --enable-shared-zlib \
      --enable-smp-support \
      --enable-threads \
      --enable-wx \
      --with-ssl=$(brew --prefix openssl@1.1) \
      --without-javac
      --enable-darwin-64bit \
      --enable-kernel-poll \
      --with-dynamic-trace=dtrace \
      "

my thinking is that --enable-darwin-64bit is doing the heavy lifting

That same compile that took 10 minutes now takes about 1:30, so about 2x faster than the macbook air.