60: Compile Faster with Marc-André Lafortune

We talk with Marc-André Lafortune about reducing Elixir project compile times. On larger projects, when a single file like a view template is changed and over 100 files get recompiled, there is something wrong. Marc-André explains how he identified the problems in his project and contributed to Elixir’s mix xref tool making it easier for us to find those problems in our own projects! We cover how these tooling improvements were used to improve the upcoming Phoenix 1.6 and Elixir 1.13! An additional mix xref flag was added to run CI checks on our code to prevent accidentally adding code that slows our compile times. Show Notes online - http://podcast.thinkingelixir.com/60 Elixir Community News https://insights.stackoverflow.com/survey/2021#most-loved-dreaded-and-wanted-language-love-dread – Elixir is number 4 among the "most loved" languages on Stack Overflow's developer survey https://insights.stackoverflow.com/survey/2021#section-top-paying-technologies-top-paying-technologies – Elixir is number 3 in highest paid languages on Stack Overflow's developer survey https://github.com/nvim-treesitter/nvim-treesitter/pull/1645 – Neovim adds tree-sitter (a syntax parser) support for the Surface library https://github.com/surface-ui/surface_tailwind/issues/1#issuecomment-884981076 – Surface Catalogue to continue and may redesign the UI using TailwindCSS https://github.com/phoenixframework/phoenix/issues/4403#issuecomment-895354673 – Phoenix 1.6 possibly released this week? Do you have some Elixir news to share? Tell us at @ThinkingElixir or email at [email protected] Discussion Resources https://twitter.com/josevalim/status/1421912595456569351 – Thread talks about the change https://groups.google.com/g/elixir-lang-core/c/Hmg5y8S3v4E/m/FVK50RWBAQAJ?pli=1 – Elixir core mailing list where feature was discussed https://hexdocs.pm/mix/master/Mix.Tasks.Xref.html#module-understanding-the-printed-graph https://github.com/elixir-lang/elixir/pull/11044 – Add "--label compile-connected" option to mix xref graph https://github.com/elixir-lang/elixir/pull/11048 – Add "--fail-above" option to mix xref making it good for CI systems https://github.com/elixir-lang/elixir/pull/11049 – Support multiple sinks and sources in mix xref graph https://github.com/elixir-lang/elixir/pull/11162 – Update docs https://github.com/elixir-lang/elixir/pull/11080 – Rely on modification time and hash to determine modified sources https://dashbit.co/blog/speeding-up-re-compilation-of-elixir-projects – Blog post on recompilations https://github.com/phoenixframework/phoenix/issues/4408 – Example 1 of sneaky macros introducing compile-time dependencies https://github.com/phoenixframework/phoenix/issues/4409 – Example 2 of sneaky macros introducing compile-time dependencies https://exercism.io/tracks/elixir https://github.com/rbenv/rbenv https://rvm.io/ https://www.super.mx/ https://xkcd.com/303/ --label compile-connected --fail-above Guest Information https://twitter.com/malafortune – on Twitter https://github.com/marcandre/ – on Github http://blog.marc-andre.ca/ – Blog Find us online Message the show - @ThinkingElixir Email the show - [email protected] Mark Ericksen - @brainlid David Bernheisel - @bernheisel Cade Ward - @cadebward