From: Kenichi Handa <handa@m17n.org>
To: Jason Rumney <jasonr@gnu.org>
Cc: eliz@gnu.org, lennart.borgman@gmail.com,
monnier@IRO.UMontreal.CA, emacs-devel@gnu.org
Subject: Re: Memory leak
Date: Mon, 19 May 2008 17:05:42 +0900 [thread overview]
Message-ID: <E1Jy0NK-0000I6-BP@etlken.m17n.org> (raw)
In-Reply-To: <482D8332.5030908@gnu.org> (message from Jason Rumney on Fri, 16 May 2008 13:50:58 +0100)
In article <482D8332.5030908@gnu.org>, Jason Rumney <jasonr@gnu.org> writes:
> If the leak is coming from the font cache, then I wouldn't expect it to
> be released when the frame is deleted, as the font cache is shared
> between all frames on w32 (and I think between all frames on the same
> display on X). Stefan is seeing 10x the increase as you are on Windows,
> which could be explained by xft loading fonts into Emacs's process
> space, while on Windows the font itself stays in system owned memory,
> and only Emacs's internal info that it associates with the font
> contributes to the growth. That also points to fonts being responsible
> (though circumstantial).
I've just installed a fix in font-cache handling. Now, even
when I create many new frames, the memory usage doesn't
increase that much. Though it still increases several
handreds K-bytes each time a new frame is created, and it is
not reduced when I delete the frames. So, I think there
still be a problem somewhere.
FYI, when I compile Emacs without gtk, the amount of
(non-freed) memory increase becomes smaller.
> There is another similar problem when we get text extents - each redraw
> cycle can call w32font_text_extents a number of times for the same
> glyph_string (from compute_glyph_string_overhangs, left_overwriting and
> right_overwriting in quick succession in draw_glyphs, with nested
> compute_overhangs_and_x within some of the if statements that cause
> extra calls for preceding and following glyph_strings if there is
> overhang, which there often is with antialising enabled). Perhaps this
> operation is cheap with the X font backends, but on Windows it is
> expensive (even with caching of metrics), and I suspect this is a major
> cause of the slowdown reported by Windows users.
I remember that I modified x_draw_glyph_string for such a
font-backend as xft that can't do foreground-only drawing
because of antialiasing, which increases the count of
overhang-checking. Perhaps we should study the code of
draw_glyphs and x_draw_glyph_string and find a solution.
---
Kenichi Handa
handa@ni.aist.go.jp
next prev parent reply other threads:[~2008-05-19 8:05 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-15 22:50 Memory leak Stefan Monnier
2008-05-15 23:06 ` David Kastrup
2008-05-16 0:25 ` Lennart Borgman (gmail)
2008-05-16 8:35 ` Eli Zaretskii
2008-05-16 9:03 ` Juanma Barranquero
2008-05-16 9:25 ` Eli Zaretskii
2008-05-16 9:29 ` Juanma Barranquero
2008-05-16 9:46 ` Eli Zaretskii
2008-05-16 9:49 ` Juanma Barranquero
2008-05-16 20:13 ` Stephen J. Turnbull
2008-05-16 21:15 ` [OT, silly] " Thomas Lord
2008-05-16 20:41 ` David Robinow
2008-05-16 21:36 ` Lennart Borgman (gmail)
2008-05-17 7:10 ` Eli Zaretskii
2008-05-16 9:43 ` Eli Zaretskii
2008-05-16 12:50 ` Jason Rumney
2008-05-19 8:05 ` Kenichi Handa [this message]
2008-05-19 8:45 ` YAMAMOTO Mitsuharu
2008-05-19 11:13 ` Kenichi Handa
2008-05-19 11:59 ` YAMAMOTO Mitsuharu
2008-05-23 2:24 ` Kenichi Handa
2008-05-19 13:34 ` David Hansen
2008-05-19 19:42 ` David Hansen
2008-05-24 2:30 ` calculation of text extents [Re: Memory leak] Kenichi Handa
2008-05-16 2:19 ` Memory leak Stefan Monnier
2008-05-16 0:38 ` YAMAMOTO Mitsuharu
2008-05-17 15:16 ` Evil Boris
2008-05-17 19:11 ` Stephen J. Turnbull
2008-05-17 19:17 ` Eric Hanchrow
2008-05-18 11:26 ` Jan Djärv
2008-05-18 11:29 ` David Kastrup
2008-05-20 6:46 ` Jan Djärv
2008-05-18 13:34 ` Werner LEMBERG
2008-05-20 6:48 ` Jan Djärv
2008-05-19 2:44 ` Stephen J. Turnbull
2008-05-20 6:50 ` Jan Djärv
2008-05-21 6:10 ` Stephen J. Turnbull
2008-05-21 17:32 ` Stefan Monnier
2008-05-23 13:54 ` Evil Boris
-- strict thread matches above, loose matches on Subject: below --
2008-05-30 22:39 memory leak Drew Adams
2008-05-31 7:57 ` David Kastrup
2008-05-24 23:02 Memory leak Nick Roberts
2006-04-28 17:51 memory leak Robert J. Chassell
2006-04-28 18:10 ` Andreas Schwab
2006-04-28 20:25 ` Robert J. Chassell
2006-04-29 1:56 ` Luc Teirlinck
2006-04-29 11:16 ` Robert J. Chassell
2006-04-29 14:06 ` Luc Teirlinck
2006-04-29 16:41 ` Robert J. Chassell
2006-04-29 17:07 ` Luc Teirlinck
2006-04-29 19:32 ` Robert J. Chassell
2006-04-30 3:03 ` Richard Stallman
2006-04-30 4:15 ` Luc Teirlinck
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