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List: kwin
Subject: Re: Review Request: Fixing massive memory consumption in KWin using
From: "Commit Hook" <null () kde ! org>
Date: 2011-08-17 16:13:55
Message-ID: 20110817161355.4879.52793 () vidsolbach ! de
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This review has been submitted with commit 66b2cc4d31e380e3b2bc7e47477029fc39fb7ac7 \
by Philipp Knechtges to branch KDE/4.7.
- Commit
On June 26, 2011, 1:27 p.m., Philipp Knechtges wrote:
>
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> http://git.reviewboard.kde.org/r/101385/
> -----------------------------------------------------------
>
> (Updated June 26, 2011, 1:27 p.m.)
>
>
> Review request for kwin and Plasma.
>
>
> Summary
> -------
>
> The intention of this patch is to lower the heap fragmentation in KWin when using \
> the raster backend.
> One can illustrate the issue with the following testcase: If one currently uses the \
> raster backend and switches back to non-compositing mode one gets easily a similar \
> memory usage like the following:
> Situation: 14 windows, QtCurve
> KWin started with compositing: 40 MB
> KWin switched to non-compositing : more than 70 MB
>
> The first guess might be, that this is due to a memleak because of not properly \
> released pixmaps. But calling malloc_stats() sheds some more light on the subject \
> (non-compositing mode):
> Arena 0:
> system bytes = 72232960
> in use bytes = 8180512
> Arena 1:
> system bytes = 135168
> in use bytes = 4784
> Total (incl. mmap):
> system bytes = 73080832
> in use bytes = 8898000
> max mmap regions = 13
> max mmap bytes = 36343808
>
> In other words, the glibc has allocated more than 70 MB memory although KWin uses \
> only less than 10 MB. The problem is that glibc only resizes the heap if the heap \
> has more than 128 KB of free space at the end, but many decoration pixmaps are \
> smaller. Using mallopt to tune the threshold to 20 KB (i'm open for other \
> suggestions?) fixes the issue. After the patch:
>
> KWin in compositing mode: 19 MB
> KWin switched to non-compositing: 13 MB
>
>
> Arena 0:
> system bytes = 12374016
> in use bytes = 6894544
> Arena 1:
> system bytes = 135168
> in use bytes = 4784
> Total (incl. mmap):
> system bytes = 13750272
> in use bytes = 8140416
> max mmap regions = 67
> max mmap bytes = 99463168
>
> Are there some negative effects?
> The only negative effect i am aware of is, that Glibc free() is calling the sbrk \
> syscall more often. But this should not be a bottleneck.
>
>
> Diffs
> -----
>
> ConfigureChecks.cmake e8b64a2
> config-workspace.h.cmake fabe7fa
> kwin/main.cpp f767f54
> libs/kworkspace/kworkspace.h f24ea42
> libs/kworkspace/kworkspace.cpp 5e9afb9
>
> Diff: http://git.reviewboard.kde.org/r/101385/diff
>
>
> Testing
> -------
>
> Tested using a standard Fedora 14.
> Would be nice to know, whether other OSes have similar issues?
> Martin Gräßlin had some concerns about the portability?
>
>
> Thanks,
>
> Philipp
>
>
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This is an automatically generated e-mail. To reply, visit:
<a href="http://git.reviewboard.kde.org/r/101385/">http://git.reviewboard.kde.org/r/101385/</a>
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<br />
<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: \
-pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This review has been \
submitted with commit 66b2cc4d31e380e3b2bc7e47477029fc39fb7ac7 by Philipp Knechtges \
to branch KDE/4.7.</pre> <br />
<p>- Commit</p>
<br />
<p>On June 26th, 2011, 1:27 p.m., Philipp Knechtges wrote:</p>
<table bgcolor="#fefadf" width="100%" cellspacing="0" cellpadding="8" \
style="background-image: \
url('http://git.reviewboard.kde.org/media/rb/images/review_request_box_top_bg.png'); \
background-position: left top; background-repeat: repeat-x; border: 1px black \
solid;"> <tr>
<td>
<div>Review request for kwin and Plasma.</div>
<div>By Philipp Knechtges.</div>
<p style="color: grey;"><i>Updated June 26, 2011, 1:27 p.m.</i></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
<table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" style="border: \
1px solid #b8b5a0"> <tr>
<td>
<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: \
-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: \
break-word;">The intention of this patch is to lower the heap fragmentation in KWin \
when using the raster backend.
One can illustrate the issue with the following testcase: If one currently uses the \
raster backend and switches back to non-compositing mode one gets easily a similar \
memory usage like the following:
Situation: 14 windows, QtCurve
KWin started with compositing: 40 MB
KWin switched to non-compositing : more than 70 MB
The first guess might be, that this is due to a memleak because of not properly \
released pixmaps. But calling malloc_stats() sheds some more light on the subject \
(non-compositing mode):
Arena 0:
system bytes = 72232960
in use bytes = 8180512
Arena 1:
system bytes = 135168
in use bytes = 4784
Total (incl. mmap):
system bytes = 73080832
in use bytes = 8898000
max mmap regions = 13
max mmap bytes = 36343808
In other words, the glibc has allocated more than 70 MB memory although KWin uses \
only less than 10 MB. The problem is that glibc only resizes the heap if the heap has \
more than 128 KB of free space at the end, but many decoration pixmaps are smaller. \
Using mallopt to tune the threshold to 20 KB (i'm open for other suggestions?) \
fixes the issue. After the patch:
KWin in compositing mode: 19 MB
KWin switched to non-compositing: 13 MB
Arena 0:
system bytes = 12374016
in use bytes = 6894544
Arena 1:
system bytes = 135168
in use bytes = 4784
Total (incl. mmap):
system bytes = 13750272
in use bytes = 8140416
max mmap regions = 67
max mmap bytes = 99463168
Are there some negative effects?
The only negative effect i am aware of is, that Glibc free() is calling the sbrk \
syscall more often. But this should not be a bottleneck.</pre>
</td>
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</table>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
<table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" style="border: \
1px solid #b8b5a0"> <tr>
<td>
<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: \
-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: \
break-word;">Tested using a standard Fedora 14. Would be nice to know, whether other \
OSes have similar issues? Martin Gräßlin had some concerns about the \
portability?</pre> </td>
</tr>
</table>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
<ul style="margin-left: 3em; padding-left: 0;">
<li>ConfigureChecks.cmake <span style="color: grey">(e8b64a2)</span></li>
<li>config-workspace.h.cmake <span style="color: grey">(fabe7fa)</span></li>
<li>kwin/main.cpp <span style="color: grey">(f767f54)</span></li>
<li>libs/kworkspace/kworkspace.h <span style="color: grey">(f24ea42)</span></li>
<li>libs/kworkspace/kworkspace.cpp <span style="color: grey">(5e9afb9)</span></li>
</ul>
<p><a href="http://git.reviewboard.kde.org/r/101385/diff/" style="margin-left: \
3em;">View Diff</a></p>
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