Force compilation of a single file/files for benchmarking purposes

[Tobias Pfeiffer]

Hi everyone and as always, thanks for your amazing work!

Jokes have been lobbied at me in the spirit of the "breaks my worlfow" XKCD [1]  - but, please here me out!

Since the (amazing!) 1.13 [2] elixir semantic recompilation changes I can't easily force recompilation on single files.

The best I know how, is adding empty comments to the files. That is fine for single tries. However, for those who know me, I like benchmarking. Particularly, I'd like to use something like hyperfine [3] to benchmark the compilation. I could write scripts to add/remove comments in between but it seems clumsy.

I might be missing a variant to get this done here.If so, I apologize for not first going to elixirforum.

As for _why_ do I want to do this: I have 3 implementations of the same module. I'd really like to compare the impact of the implementation on compilation time (one generates a bunch of functions to pattern match, the other one just uses a map, there is one variant which also does a file read) to provide general guidance on the impact.

I had hoped that I could do `mix compile --force lib/my_file.ex`, but it always compiles everything. Enabling this interface would be my proposal to remedy this, but y'all might have better ideas or tell me it's not worth it :)

Cheers + thanks,

Tobi

[1] https://xkcd.com/1172/

[2] https://hexdocs.pm/elixir/1.13/changelog.html#semantic-recompilation

[3] https://github.com/sharkdp/hyperfine

[José Valim]

Could you potentially use `mix run lib/my_file.ex` for those cases?

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[Wojtek Mach]

You can also force recompilation by defining this function:

    def __mix_recompile__?, do: true

Wiadomość napisana przez José Valim <jose....@dashbit.co> w dniu 23.02.2023, o godz. 11:20:



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[Tobias Pfeiffer]

Interesting! I always forget elixir modules are also "just" evaluated until I don't. `mix run --no-start` does indeed seem to work for this use case!

Thank you!

[Tobias Pfeiffer]

Thanks, I know :) The problem with that is wanting to run a benchmark with all examples in it, so this would always force compilation for all 3 files which doesn't help with that particular benchmarking case.