Improve performance of algorithm to determine project deps #518
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Introduces smarter tracking of deps as they are loaded. These changes help to avoid traversing the same dep sub-trees multiple times. For larger projects, including umbrella projects, the same can be traversed millions of times.
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jeremyjh
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Sep 16, 2023
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Introduces smarter tracking of deps as they are loaded. These changes help to avoid traversing the same dep sub-trees multiple times. For larger projects, including umbrella projects, the same dep can be traversed millions of times.
One of our larger projects is an umbrella project with 20 umbrella apps and a little over 200 deps in our mix.lock file. With Elixir 1.15, the time it takes for dialyzer to complete increased 3x due to this issue, from 15 minutes in our CI to over 45 minutes. In order to get dialyxir working on Elixir 1.15, I also had to follow the advice in #508 to add the dialyzer dep to each app in the umbrella. I'm not sure if that caused the increase in deps being returned, or if it's due to the new logic around optional apps.
The following table represents the time it takes to run the
Dialyxir.Project.include_deps/0function against that project on my local (faster than CI machine), and how many apps the function returns: