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List:       koffice-devel
Subject:    Re: Faster saving (Re: Global save method option)
From:       David Faure <faure () kde ! org>
Date:       2004-02-15 22:57:34
Message-ID: 200402152357.34075.faure () kde ! org
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On Sunday 15 February 2004 16:56, Nicolas Goutte wrote:
> It has taken (rounded values):
> QCString: 19s
> QTextStream: 55s
> KBufferedIODevice( 8KB ): 41s
> KBufferedIODevice( 64KB ): 35s
> KBufferedIODevice( 128KB ): 34s
> 
> So something is still worng.

valgrind-calltree/KCachegrind explains it. It's the unicode->utf8 conversion 
that takes too much time with the QTextStream solutions, because the codec is 
triggered for every character - whereas with the QCString solution it's only 
triggered once, for the whole of the data.

I also agree with waiting for Qt 4, we'll optimize then, depending on how it 
does it.

-- 
David Faure, faure@kde.org, sponsored by Trolltech to work on KDE,
Konqueror (http://www.konqueror.org), and KOffice (http://www.koffice.org).
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