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Load modules for mix recompile in parallel #14004

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Load modules for mix recompile in parallel #14004

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15 changes: 12 additions & 3 deletions lib/mix/lib/mix/compilers/elixir.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -373,8 +373,7 @@ defmodule Mix.Compilers.Elixir do
Map.has_key?(stale_modules, module) ->
{[module | modules_to_recompile], modules_to_mix_check}

recompile? and Code.ensure_loaded?(module) and
function_exported?(module, :__mix_recompile__?, 0) ->
recompile? ->
{modules_to_recompile, [module | modules_to_mix_check]}

true ->
Expand All @@ -385,7 +384,17 @@ defmodule Mix.Compilers.Elixir do
modules_to_recompile =
modules_to_recompile ++
for {:ok, {module, true}} <-
Task.async_stream(modules_to_mix_check, &{&1, &1.__mix_recompile__?()},
Task.async_stream(
modules_to_mix_check,
fn mod ->
# Since loading the modules themselves can be expensive,
# we want to do it inside the task too. Modules being deleted
# are uncommon, so this optimizes the common case.
{mod,
Code.ensure_loaded?(mod) and
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Won't that effectively synchronize on code_server?

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@josevalim josevalim Nov 20, 2024 •
edited
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Code loading happens mostly on the caller since Erlang/OTP 26, serializing only if there are on_load callbacks.

function_exported?(mod, :__mix_recompile__?, 0) and
mod.__mix_recompile__?()}
end,
ordered: false,
timeout: :infinity
) do
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