From: Alan Mackenzie <acm@muc.de>
To: martin rudalics <rudalics@gmx.at>
Cc: Eli Zaretskii <eliz@gnu.org>, John Wiegley <johnw@gnu.org>,
emacs-devel@gnu.org
Subject: Re: 33% speed up in CC Mode scrolling.
Date: Mon, 27 Jun 2016 18:44:30 +0000 [thread overview]
Message-ID: <20160627184430.GD4526@acm.fritz.box> (raw)
In-Reply-To: <57716257.5040304@gmx.at>
Hello, Martin.
On Mon, Jun 27, 2016 at 07:28:55PM +0200, martin rudalics wrote:
> > font-lock-maximum-decoration elapsed average
> > 3 1.999 0.012
> > 2 1.765 0.010
> > 1 1.466 0.009
> > In comparison the optimized build with ‘font-lock-maximum-decoration’ 3
> > gets me:
> > 3 0.409 0.002
> These tests actually time scrolling only so they are misleading. Using
> the modified attached file the results below are more accurate: R stands
> for the release branch, M for master, and O for an optimized build of
> master. The following number is the ‘font-lock-maximum-decoration’
> value - 1, 2 or 3. So R3 stands for the release branch with decoration
> level 3. The second column is the elapsed, the third the average time.
> R3 109.61000000 0.6485798816
> M3 79.62599999 0.4711597633
> O3 11.516 0.0681420118
> R2 23.71799999 0.1403431952
> M2 25.35900000 0.1500532544
> R1 19.32799999 0.1143668639
> M1 20.406 0.1207455621
> So there is a significant speed up from R3 to M3 .....
This is the 33% speedup of the Subject: line.
> ....., and the speed up of M3 to M2 is by a factor of 3 approximately.
I see this, too. The point is that fontification can hardly go faster
than level 1, which is mainly just syntactic fontification (i.e. strings
and comments). The difference between levels 2 and 1 is probably small
enough that one might as well use level 2.
> With decoration levels 2 and 1 master is slightly slower than the
> release branch here.
I should keep an eye on this to make sure "slightly" is as far as it
goes. It is interesting that the optimised compilation wins as much as
a factor of ~7.
My timing on this is (M-x foofoo on .../src/frame.c):
O3 7.1140785890 0.0817710182
Q3 8.939460839 0.1027524234
, where "Q3" is an optimised build from the release branch.
> martin
--
Alan Mackenzie (Nuremberg, Germany).
next prev parent reply other threads:[~2016-06-27 18:44 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-15 22:20 33% speed up in CC Mode scrolling Alan Mackenzie
2016-06-16 0:41 ` John Wiegley
2016-06-16 1:02 ` Clément Pit--Claudel
2016-06-16 23:15 ` Richard Stallman
2016-06-17 15:38 ` Alan Mackenzie
2016-06-19 17:21 ` Richard Stallman
2016-06-20 0:44 ` Stefan Monnier
2016-06-20 23:04 ` Richard Stallman
2016-06-21 0:47 ` Stefan Monnier
2016-06-22 6:34 ` Richard Stallman
2016-06-27 6:31 ` martin rudalics
2016-06-27 12:49 ` Alan Mackenzie
2016-06-27 16:10 ` martin rudalics
2016-06-27 17:28 ` martin rudalics
2016-06-27 18:44 ` Alan Mackenzie [this message]
2016-06-28 8:23 ` martin rudalics
2016-06-28 10:27 ` Alan Mackenzie
2016-06-27 16:28 ` Eli Zaretskii
2016-06-27 16:57 ` martin rudalics
2016-06-27 19:31 ` Eli Zaretskii
2016-06-28 8:23 ` martin rudalics
2016-06-28 9:18 ` Alan Mackenzie
2016-06-28 13:03 ` bug#23861: 25.1.50; fast-but-imprecise-scrolling: What does "somewhat inaccurate" mean? Phil Sainty
2016-06-28 16:14 ` Eli Zaretskii
2019-10-14 12:35 ` Stefan Kangas
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