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Re: Emacs 23.0 is much slower starting than Emacs 22.3
From: |
Stefan Monnier |
Subject: |
Re: Emacs 23.0 is much slower starting than Emacs 22.3 |
Date: |
Fri, 24 Oct 2008 14:42:52 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (gnu/linux) |
>>> Most of the latter is in "hack-project-variables", and most of /that/ is
>>> "project-find-settings-file", and most of that is the
>>> "locate-dominating-file" walk.
>> locate-dominating-file (or rather some equivalent code) is also used in
>> VC to detect the revision control system used for the file.
>> It's actually used 5 times there (once each for Bzr Git Hg Mtn Arch), so
>> are you sure only the one in project-find-settings-file costs us
>> the slowdown?
> Not all of it, but it seems to be significant.
> taking out locate-dominating-file with:
> (defun locate-dominating-file (file regexp) nil)
> runs just now (one after the other, no reboot, so probably
> from OS cache anyway)
> emacs l-d-f realtime
> 22 n/a 4.921
> 23 off 6.188
> 23 on 7.500
> Taking out hack-project-variables as a whole similarly
> emacs h-p-v realtime
> 23 off 6.079
> So it's about 1/2 the slowdown?
> Then I set vc-handled-backends to nil (not sure that stops
> vc searching totally, mind):
> emacs vc-h-b h-p-v realtime
> 23 off off 5.503
> 23 off on 7.189
Setting vc-handled-backends to nil should indeed stop VC from doing
those directory walks. So now I don't understand why the walks done by
VC are so much cheaper than the ones done by locate-dominating-file.
Could it be that all the files you opened were under CVS control (so
the VC search stops before having to walk up the directories)?
Stefan
- Re: Emacs 23.0 is much slower starting than Emacs 22.3, (continued)
- Re: Emacs 23.0 is much slower starting than Emacs 22.3, Alan Mackenzie, 2008/10/24
- Re: Emacs 23.0 is much slower starting than Emacs 22.3, David De La Harpe Golden, 2008/10/24
- Re: Emacs 23.0 is much slower starting than Emacs 22.3, Alan Mackenzie, 2008/10/24
- Re: Emacs 23.0 is much slower starting than Emacs 22.3, David De La Harpe Golden, 2008/10/24
- Re: Emacs 23.0 is much slower starting than Emacs 22.3, Stefan Monnier, 2008/10/24
- Re: Emacs 23.0 is much slower starting than Emacs 22.3, David De La Harpe Golden, 2008/10/24
- Re: Emacs 23.0 is much slower starting than Emacs 22.3,
Stefan Monnier <=
- Re: Emacs 23.0 is much slower starting than Emacs 22.3, David De La Harpe Golden, 2008/10/24
- Re: Emacs 23.0 is much slower starting than Emacs 22.3, David De La Harpe Golden, 2008/10/24
- Re: Emacs 23.0 is much slower starting than Emacs 22.3, Stefan Monnier, 2008/10/25
- Re: Emacs 23.0 is much slower starting than Emacs 22.3, David De La Harpe Golden, 2008/10/25
- Re: Emacs 23.0 is much slower starting than Emacs 22.3, Eli Zaretskii, 2008/10/24
- Re: Emacs 23.0 is much slower starting than Emacs 22.3, Eli Zaretskii, 2008/10/24
- Re: Emacs 23.0 is much slower starting than Emacs 22.3, Eli Zaretskii, 2008/10/24
- Re: Emacs 23.0 is much slower starting than Emacs 22.3, Miles Bader, 2008/10/22
- Re: Emacs 23.0 is much slower starting than Emacs 22.3, Alan Mackenzie, 2008/10/23
Re: Emacs 23.0 is much slower starting than Emacs 22.3, Eli Zaretskii, 2008/10/22