[commit: ghc] master: Set default-impl of `mapM`/`sequence` methods to `traverse`/`sequenceA` (f636faa)

[Edward Kmett]

Hrmm. I wonder if that is in part caused by the inefficient use of sequence
in

https://github.com/ghc/nofib/blob/master/spectral/fibheaps/Main.lhs#L234

If that sequence . map is swapped for a traverse, what happens?

-Edward

On Mon, Sep 29, 2014 at 3:44 AM, Joachim Breitner <mail at joachim-breitner.de>
wrote:

> Hi,
>
>
> Am Samstag, den 27.09.2014, 21:07 +0000 schrieb git at git.haskell.org:
> > commit f636faa7b2b7fc1d0663f994ad08f365d39a746d
> > Author: Herbert Valerio Riedel <hvr at gnu.org>
> > Date:   Sat Sep 27 22:55:19 2014 +0200
> >
> >     Set default-impl of `mapM`/`sequence` methods to
> `traverse`/`sequenceA`
> >
> >     This is made possible by the AMP, as we don't need the `WrappedMonad`
> >     helper for that anymore.
>
> according to
>
> http://ghcspeed-nomeata.rhcloud.com/changes/?rev=f636faa7b2b7fc1d0663f994ad08f365d39a746d&exe=2&env=nomeata%27s%20buildbot
> this has caused a 11% regression in fibheaps allocation:
>
> http://ghcspeed-nomeata.rhcloud.com/timeline/?ben=nofib/allocs/fibheaps&env=1#/?exe=2&base=2+68&ben=nofib/allocs/fibheaps&env=1&revs=50&equid=on
>
> Greetings,
> Joachim
>
> --
> Joachim “nomeata” Breitner
>   mail at joachim-breitner.de • http://www.joachim-breitner.de/
>   Jabber: nomeata at joachim-breitner.de  • GPG-Key: 0xF0FBF51F
>   Debian Developer: nomeata at debian.org
>
>
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