What type of performance regression testing does GHC go through?

Tom Ellis tom-lists-haskell-cafe-2017 at jaguarpaw.co.uk
Thu Mar 11 10:32:30 UTC 2021

A user posted the following to the ghc-proposals repository.  Both JB
and RAE suggested ghc-devs as a more appropriate forum.  Since I have
no idea whether the user has even ever used a mailing list before I
thought I would lower the activation energy by posting their message
for them.


> Hi,
> Does the GHC release or development process include regression
> testing for performance?
> Is this the place to discuss ideas for implementing such a thing and
> to eventually craft a proposal?
> I believe the performance impact of changes to GHC needs to be
> verified/validated before release. I also believe this would be
> feasible if we tracked metrics on building a wide variety of
> real-world packages. Using real-world packages is one of the best
> ways to see the actual impact users will experience. It's also a
> great way to broaden the scope of tests, particularly with the
> combination of language pragmas and enabled features within the
> compiler.

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