Erlang brew package has the JIT disabled - should it be enabled by default?

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:wave:

Hey folks!

So, this may be me not knowing how to interact with brew maintainers or Mac.

It seems like current versions of erlang on brew do not have the JIT enabled, despite being 26.2.2.

How do I know? Well, there is a benchee test thatā€™s failing :sweat: And emu_flavor is returning :emu instead of :jit:

"26.2.2"
emu flavor: :emu

It used to work but seems to have broken in the past weeks. I canā€™t find anything suspicious in the brew formula. Other OSs also work fine, naturally.

I checked that this isnā€™t just a github action/CI behavior by running brew install erlang on my partnersā€™ mac (still an intel mac) and it also reported the emu flavor.

Does anyone have an idea where to dig/report/fix this behavior or why it is like that? I donā€™t think itā€™s on purpose, the default experience should be the ā€œJITā€ experience by now.

Iā€™m asking for the erlang experience on Mac, Iā€™m going ahead and disabling the test on mac now :sweat_smile:

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Thatā€™s expected as of 26.2.2, which disabled the jit on intel based macs: asmjit+macos+x86: ephemeral "Verifying shm-id-XXXXXXXXXXXXXXXX" security popups appear during each invocation of erlang Ā· Issue #8043 Ā· erlang/otp Ā· GitHub

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This is related to the super annoying small popup you get on Intel Macs when JIT is enabled.

Check this thread for context: Popup appears for a fraction of a second whenever a mix task is run (verifying shm-id-F8BD8E...)

Disabling the JIT is a workaround to avoid the popup. A proper fix will come in OTP 27 which is I think due in May 2024.

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@LostKobrakai @dimitarvp thank you as always! I read the changelog to identify that this isnā€™t wanted behavior but couldnā€™t find anything but maybe I was too tired :sweat_smile:

So, thanks a lot for solving this mystery for me :dancer:

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FYI, in OTP 27 can Allow explicit enabling the JIT on Intel Macs by bjorng Ā· Pull Request #8219 Ā· erlang/otp Ā· GitHub, here are my steps to enable JIT for my macOS/intel case.

Step 1

brew uninstall --ignore-dependencies erlang

Step 2

brew edit erlang

Add --enable-jit option to configure

    args = %W[
      --enable-dynamic-ssl-lib
      --enable-jit
      --enable-hipe
      --enable-shared-zlib
      --enable-smp-support
      --enable-threads
      --enable-wx
      --with-odbc=#{Formula["unixodbc"].opt_prefix}
      --with-ssl=#{Formula["openssl@3"].opt_prefix}
      --without-javac
    ]

Step 3

export HOMEBREW_NO_INSTALL_FROM_API=1
brew install erlang --build-from-source

brew install ignores locally edited casks and formulae if
HOMEBREW_NO_INSTALL_FROM_API is not set, so we temporarily export the env argument, reinstall erlang via brew installer and my local erlang formulae file occurred conflict with the above edited "--enable-jit", resolve the conflict by rerun brew edit erlang and save it.

The above steps enable JIT for my case macOS Sonama(intel) with Erlang/OTP 27.2.1

āžœ  ~ erl -eval 'io:format("~p~n", [erlang:system_info(emu_flavor)]), halt().'
Erlang/OTP 27 [erts-15.2.1] [source] [64-bit] [smp:16:16] [ds:16:16:10] [async-threads:1] [jit:ns] [dtrace]

jit
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