From kde-devel  Tue Jul 14 13:50:40 2009
From: Thiago Macieira <thiago () kde ! org>
Date: Tue, 14 Jul 2009 13:50:40 +0000
To: kde-devel
Subject: Re: KDE4 is a memory hog
Message-Id: <200907141550.40584.thiago () kde ! org>
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Em Ter=E7a-feira 14 Julho 2009, =E0s 09:34:34, Boudewijn Rempt escreveu:
> On Tuesday 14 July 2009, Thiago Macieira wrote:
> > Christian Weilbach wrote:
> > >PLEASE help improve the situation so I can use KDE4 in the future here.
> > >Any ideas how to keep the issue focused?
> >
> > I don't think we'll be able to reduce the memory usage by much. Besides
> > the gross problems, we'll probably stay at current levels.
>
> One thing I noticed when profiling KOffice was that the kconfig seem to
> take quite a bit of memory (our biggest leak was pigmentcms, which took
> 20mb on startup, according to massif kword now needs 10mb of heap for an
> empty document).
>
> I might be misinterpreting the massif output, but to me it looks as if
> kconfig takes about 2-4 mb of those 10mb left.

Depends on what it's trying to parse.

I've tried massif on Dolphin here and the biggest hogs are the font stuff=20
(freetype, fontconfig and harfbuzz), followed by QIODevice's internal buffe=
rs=20
(sockets and kDebug) and painter caches.

The largest block (20-25%), however, is from small allocations, between 150=
0=20
and 2000 of them. Those allocations average 1000 to 1200 bytes.

Running massif at the standard threshold (1%) will limit the display to=20
allocations over 50 kB or more. You need to run with a lower threshold to s=
ee=20
the bunch of small stuff.

=2D-=20
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Software
      PGP/GPG: 0x6EF45358; fingerprint:
      E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358

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