[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
bug#18522: 24.4.50; mapcar is very slow
From: |
Eli Zaretskii |
Subject: |
bug#18522: 24.4.50; mapcar is very slow |
Date: |
Fri, 19 Feb 2016 10:38:59 +0200 |
> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Fri, 19 Feb 2016 16:15:08 +1100
> Cc: 18522@debbugs.gnu.org
>
> Peter Münster <pmlists@free.fr> writes:
>
> >> (benchmark-run 1
> >> (dotimes (i 10000)
> >> (parse-time-string "Fri, 13 Feb 2015 14:40:02 +0000")))
> >>
> >> run faster in a newly started Emacs than in one that has been running
> >> for a long time?
> >
> > Hi Lars,
> >
> > It becomes slower and slower:
>
> [...]
>
> Cool! Then at least we've found the culprit. :-)
>
> Now we just have to find out why. Does anybody have any idea? Could
> somebody else also try running the benchmark form up there in a newly
> started Emacs and one that's been running for a while to see if they can
> reproduce this bug?
IMO, the benchmark needs to be changed to factor out GC, because the
time a GC takes depends on the number and structure of objects you
have in your session, and that has nothing to do with the issue at
hand.
So a better benchmark is this:
(let ((gc-cons-threshold most-positive-fixnum))
(benchmark-run 1
(dotimes (i 10000)
(parse-time-string "Fri, 13 Feb 2015 14:40:02 +0000"))))
FWIW, this takes 1.2 sec in a fresh "emacs -Q", and 2.0 sec in a
full-blown session running for 5 days. That's clearly different from
the data presented by Peter (but I don't use Gnus).
- bug#18522: 24.4.50; mapcar is very slow, Lars Ingebrigtsen, 2016/02/07
- bug#18522: 24.4.50; mapcar is very slow, Peter Münster, 2016/02/17
- bug#18522: 24.4.50; mapcar is very slow, Lars Ingebrigtsen, 2016/02/19
- bug#18522: 24.4.50; mapcar is very slow, Peder O. Klingenberg, 2016/02/19
- bug#18522: 24.4.50; mapcar is very slow,
Eli Zaretskii <=
- bug#18522: 24.4.50; mapcar is very slow, Nicolas Richard, 2016/02/19
- bug#18522: 24.4.50; mapcar is very slow, Peder O. Klingenberg, 2016/02/19
- bug#18522: 24.4.50; mapcar is very slow, Lars Ingebrigtsen, 2016/02/19
- bug#18522: 24.4.50; mapcar is very slow, Eli Zaretskii, 2016/02/20
- bug#18522: 24.4.50; mapcar is very slow, Peter Münster, 2016/02/20
- bug#18522: 24.4.50; mapcar is very slow, Eli Zaretskii, 2016/02/20
- bug#18522: 24.4.50; mapcar is very slow, Peter Münster, 2016/02/21
- bug#18522: 24.4.50; mapcar is very slow, Andreas Schwab, 2016/02/21
- bug#18522: 24.4.50; mapcar is very slow, martin rudalics, 2016/02/21
- bug#18522: 24.4.50; mapcar is very slow, Peter Münster, 2016/02/21