[Okular-devel] Epub qtextdocument high cpu usage

[Jaydeep Solanki]

On Mon, Jun 17, 2013 at 11:31 PM, Albert Astals Cid <aacid at kde.org> wrote:

> El Dilluns, 17 de juny de 2013, a les 21:42:23, Jaydeep Solanki va
> escriure:
> > 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.
>
> When you say high cpu usage you mean that top gives you high numbers? Or
> you
> are saying high cpu usage because it lags?
>
When scrolling quickly, the core on which Okular is running hits 100% usage
(stats obtained using System Monitor).
+ it lags.

>
> Cheers,
>   Albert
>
> >
> > > Cheers,
> > >
> > >   Albert
> > >
> > > > If you want me to create a review request, I'll do it.
> > > >
> > > > Cheers,
> > > > Jaydeep
> > >
> > > _______________________________________________
> > > Okular-devel mailing list
> > > Okular-devel at kde.org
> > > https://mail.kde.org/mailman/listinfo/okular-devel
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