Red Hat Bugzilla – Bug 481800
pidgin gtk-spell excessive memory use
Last modified: 2010-06-28 07:09:17 EDT
Description of problem:
When running pidgin with like 20 tabs and 50+ (mostly offline) contacts in couple of XMPP accounts, pidgin runs in whole day session way above 1.5GB VIRT RAM in a day and computer is almost unusable.
After lengthy discussion on #performance channel of irc.gnome.org I run valgrind with the suggested paramters
G_SLICE=always-malloc G_DEBUG=gc-friendly valgrind --leak-check=full \
--show-reachable=yes --leak-resolution=high pidgin
over night. Unfortunately on computer with 1GB hardware RAM, I hit OOM killer, but results seems to be interesting anyway.
What's the deal with pidgin_setup_gtkspell() being called a zillion times?
Attached all results of my analysis.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.run pidgin whole day
top shows over 1.5 GB VIRT RAM in top and computer crawls for its life
memory consumption of memory shouldn't go over couple of hundred megs.
Created attachment 330119 [details]
dmesg from the analysis
Created attachment 330120 [details]
dmesg.out from the analysis
Created attachment 330121 [details]
messages from the analysis
Created attachment 330122 [details]
messages-20090127 from the analysis
Created attachment 330123 [details]
performance-irc-gnome-org-log.txt from the analysis
Created attachment 330125 [details]
pidgin-valgrind-03.txt.bz2 from the analysis
Created attachment 330305 [details]
first log with the idea to switch off spellchecker
After more discussions on #pidgin I tried to switch off spellchecker-as-you-go in pidgin and the memory consumption went drastically down to the level that pidgin is useful to me again.
attaching relevant logs of #pidgin on this.
Created attachment 330306 [details]
second log confirming that switching off spellchecker helped
It turns out that GtkSpell isn't using enchant in such a way that allows it to reuse dictionaries between multiple instances: https://sourceforge.net/tracker/index.php?func=detail&aid=2642198&group_id=7896&atid=107896
Maybe it could be useful to copy here verbatim the IRC conversation from the Sourceforge ticket:
Here is an IRC conversation with the enchant maintainer about the subject:
09:08 < datallah> dom: https://bugzilla.redhat.com/show_bug.cgi?id=481800
that is the bug report relating to the enchant memory usage issues a few
09:09 < datallah> There is a lot of irrelevant information there, but the
problem as far as I can see is that the dictionary isn't shared between
multiple gtkspell instances (which is perhaps a gtkspell problem, but I
thought that the caching would occur at the enchant layer).
09:10 < dom> some significant caching does happen at the enchant layer
09:10 < dom> all dictionaries are cached at the "broker" level
09:10 < dom> if pidgin or gtkspell is creating lots of brokers, it's going
to load lots of dictionaries
09:11 < dom> the broker was meant to be a singleton, and is documented as
09:11 < dom> but there's nothing enforcing you to use it as such
09:11 < datallah> ok, i'll check how gtkspell does it.
09:31 < datallah> gtkspell uses a broker per instance
09:33 < dom> that would explain it
This bug appears to have been reported against 'rawhide' during the Fedora 11 development cycle.
Changing version to '11'.
More information and reason for this action is here:
GtkSpell 2.0.16 has been released with a fix for this issue:
This message is a reminder that Fedora 11 is nearing its end of life.
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