[Haskell-cafe] long-range performance comparisons (GHC over the years)

[Thomas Miedema]

Hi Johannes,

see also this wiki page:
https://ghc.haskell.org/trac/ghc/wiki/Performance/Runtime.

It mentions the  `gcd` regression that you found (and has some analysis),
but not the others (`tak` and `exp3_8`). Maybe you could start with
updating that page.

Thomas

On Thu, Jan 7, 2016 at 9:55 AM, Simon Peyton Jones <simonpj at microsoft.com>
wrote:

> Yes we’d love help with investigating, characterising, and fixing
> performance bugs.
>
>
>
> Simon
>
>
>
> *From:* Haskell-Cafe [mailto:haskell-cafe-bounces at haskell.org] *On Behalf
> Of *Thomas Miedema
> *Sent:* 07 January 2016 00:52
> *To:* Johannes Waldmann <johannes.waldmann at htwk-leipzig.de>
> *Cc:* Joachim Breitner <mail at joachim-breitner.de>; Haskell cafe <
> haskell-cafe at haskell.org>
> *Subject:* Re: [Haskell-cafe] long-range performance comparisons (GHC
> over the years)
>
>
>
> I recently noticed a performance problem
>
> ...
>
> What worries me is that such a regression
> had been sitting there for over a year
>
>
>
> There are 215 open *runtime performance
> <https://ghc.haskell.org/trac/ghc/query?status=!closed&failure=Runtime+performance+bug&order=id>* tickets
> (out of a total of 1655 open tickets, that makes 13%).
>
>
>
> Compared to say new typesystem features, they don't get much attention.
> Only a few were fixed
> <https://ghc.haskell.org/trac/ghc/query?failure=Runtime+performance+bug&resolution=fixed&milestone=8.0.1&milestone=7.10.3&milestone=7.10.2> this
> year, most of them by Joachim Breitner (the new performance tsar
> <https://ghc.haskell.org/trac/ghc/wiki/CodeOwners#CurrentOwners>?). He
> also created https://perf.haskell.org/ghc
> <https://na01.safelinks.protection.outlook.com/?url=https%3a%2f%2fperf.haskell.org%2fghc%2f&data=01%7c01%7csimonpj%40064d.mgd.microsoft.com%7cc3af688d2c234b3c19b608d316fcb626%7c72f988bf86f141af91ab2d7cd011db47%7c1&sdata=Ik7nCUHxNalCIxrv9E8dq2od9ed%2bbbLXJ%2fJJyHLCIhQ%3d>
> .
>
>
>
> In case you want to help out, start here:
> https://ghc.haskell.org/trac/ghc/wiki/Newcomers.
>
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