[commit: ghc] master: Fix a couple of inaccurate stack checks (3bebf3c)

Joachim Breitner mail at joachim-breitner.de
Fri Nov 7 20:07:32 UTC 2014


Am Donnerstag, den 06.11.2014, 13:44 +0100 schrieb Joachim Breitner:
> Am Mittwoch, den 05.11.2014, 18:15 +0000 schrieb git at git.haskell.org:
> > commit 3bebf3c2d92e6defc6d17ffa237cc4a9cad71dcf
> > Author: Simon Marlow <marlowsd at gmail.com>
> > Date:   Tue Nov 4 21:31:00 2014 +0000
> > 
> >     Fix a couple of inaccurate stack checks
> I observe a 5% runtime performance regression in nofib’s "integer"
> benchmark:
> http://ghcspeed-nomeata.rhcloud.com/timeline/?exe=2&base=2%2B68&ben=nofib%2Ftime%2Finteger&env=2&revs=50&equid=on
> (The graph looks weird because codespeed doesn’t get the order of
> commits right.)
> Expected? Or worth looking into?

I’m no longer sure its caused by this commit. That test suddenly behaves
rather erratic. Maybe it was something else that pushed it close to some
GC run threshold. *shrug*

Joachim Breitner
  e-Mail: mail at joachim-breitner.de
  Homepage: http://www.joachim-breitner.de
  Jabber-ID: nomeata at joachim-breitner.de

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