[Okular-devel] Epub qtextdocument high cpu usage

[Jaydeep Solanki]

On Sun, Jun 16, 2013 at 8:42 PM, Albert Astals Cid <aacid at kde.org> wrote:

> El Diumenge, 16 de juny de 2013, a les 20:29:37, Jaydeep Solanki va
> escriure:
> > Hello,
> > As I was finding it difficult to make progress using webkit to render
> epub,
> > I spent some time experimenting around with QTextDocument.
> > A small patch is attached which fixes the issues with the body tag (eg :
> > background color).
> >
> > It works fine with me, the only issue I'm facing is that it gives a high
> > cpu usage, which leads to lag while scrolling fast.
> >
> > I'm not getting the reason behind its high cpu usage.
>
> Have you tried running it with callgrind option of valgrind + kcachegrind?
>
Till now I didn't know anything about profiling, I'm glad you brought it up.

I looked at the stats,

   - 'okularGenerator_epub.so' collectively costs only 0.01 (self), that's
   also while loading the document.
   - impact of QTextDocument in 'libQtGui.so' is around 0.03 (self)
   - 'libokularcore.so' which contains TextDocumentUtils collectively costs
   0.68

It doesn't appear to have a major impact.

>
> Cheers,
>   Albert
>
> >
> > If you want me to create a review request, I'll do it.
> >
> > Cheers,
> > Jaydeep
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