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List:       kde-devel
Subject:    Re: KDE4 is a memory hog
From:       Ferdinand Gassauer <gassauer () kde ! org>
Date:       2009-07-16 5:44:58
Message-ID: 200907160744.58804.gassauer () kde ! org
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On Tuesday 14 July 2009 15:58:48 Thiago Macieira wrote:
just want to say that after installing the latest Factory builds KDE bacame 
really snappy. - and much reduced memory requirements and much more shared mem 
used.
> Em Terça-feira 14 Julho 2009, às 10:40:11, Ferdinand Gassauer escreveu:
> > On Monday 13 July 2009 23:27:13 Thiago Macieira wrote:
> > > The use of MySQL in Amarok and Akonadi increases the memory usage by
> > > another 30 MB (just by starting MySQL). The use of the NVidia driver
> > > consumes another 10 MB *per* *process*: amarok, plasma, ksmserver, kwin
> > > (unless you're using KDE 4.3).
> >
> > I just uninstalled the nvidia driver .... - seems that memory consumption
> > decreases and preceived speed increases significantly (due to no more
> > swaping)
>
> Swapping shouldn't be an issue, but memory consumption definitely.
>
> First of all, don't use the NVidia driver with KDE 4.2. Use 4.3, since it
> includes Lubo¨'s fix to share it. (so instead of having 3 or 4 applications
> with libGL.so loaded, we have ALL KDE applications doing that, but sharing
> it)
>
> Second, I think that the most memory used by X and by kwin is due to pixmap
> caching. Then remember Qt applications do double-buffering too, which leads
> to triple buffering of everything. There was even a bug in Oxygen that
> caused KWin to enable double-buffering of its own, which would lead to
> quadruple-buffering, but I think that has been fixed for a year.
>
> If you run xrestop, you'll see the number of pixmaps in use. Up until last
> week, plasma would leak a lot of pixmaps. KWin too, until this weekend in
> trunk. Those leakages cause the process memory space to grow as well as X's
> own.
>
> Since Plasma and KWin were fixed, the biggest aggressors for me are Kontact
> (mostly Akregator, which btw can't do KIO correctly, launching a hundred
> kio_http) and Skype. Now, we can't fix Skype unless it's a leak inside Qt,
> but Kontact we can.
>
> res-base Wins  GCs Fnts Pxms Misc   Pxm mem  Other   Total   PID Identifier
> 4200000    45   39    0 2569 2677    42744K     64K  42809K 30060 skype
> 4c00000    29    9    0  614  852     8877K     20K   8898K 23117 E-mail -
> Kontact
>
> (this kontact is not running akregator; if I run it, it eventually exhausts
> the X pixmap memory)
>
> In my current setup, X is holding 128 MB of pixmaps. So no wonder:
>
> F   UID   PID  PPID PRI  NI    VSZ   RSS WCHAN  STAT TTY        TIME
> COMMAND 4     0  7760  5810  20   0 524676 184420 poll_s Ss+ tty7    
> 571:56 /etc/X11/X

-- 
cu
ferdinand

["memusage1.png" (image/png)]

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