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List:       kde-devel
Subject:    Re: session management and huge amounts of data
From:       Steffen Hansen <stefh () mip ! sdu ! dk>
Date:       1999-05-13 22:02:37
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On Thu, 13 May 1999 pbrown@redhat.com wrote:

> On Thu, 13 May 1999, Uwe Thiem wrote:
> 
> > Load a 100KB document into kless (from kdesdk/kexample - kedit or
> > kwrite won't show the behaviour because they don't save the date
> > itself but the file name resp. URL only). If you log out from KDE
> > it takes several minutes to save the data. It isn't related to
> > storing the whole data into a QString; that's fast.
> > KConfig::writeEntry() takes all the time. Same for 
> > KConfig::readEntry().
> 
> I'm working on KConfig right now, both for memory usage improvements and
> speed issues.
> 
> Speed improvement suggestions welcome. :)  I'm converting the in-memory
> storage from QDict to a QMap to improve memory usage.

As i said in a previous mail: It might be worth it to try _not_ to load
the file into a data-structure at first, and instead iterate through
the file to do lookup on a key. This will make apps start faster. After a
key/value pair has been requested for the first time, it could be put into
a QMap for fast reference later. But if we have too long files this will
of course be too slow.

Also i think it will be a good idea to use only one QMap per config file.
The key could be pair<QString,QString> for the group and the key. When
comparing two pairs the key-part should be compared first.

greetings,
--------------
Steffen Hansen                              |
email: stefh@mip.sdu.dk, stefh@imada.sdu.dk,|  
       hansen@kde.org                       | ABC...VWXKZ :)
URL:   http://www.mip.sdu.dk/~stefh         | 

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