Bug 341161 - Utilize more than one CPU core
Summary: Utilize more than one CPU core
Status: RESOLVED DUPLICATE of bug 185908
Alias: None
Product: okular
Classification: Applications
Component: PDF backend (show other bugs)
Version: 0.20.60
Platform: Chakra Linux
: NOR wishlist
Target Milestone: ---
Assignee: Okular developers
URL:
Keywords: investigated, triaged
Depends on:
Blocks:
 
Reported: 2014-11-21 14:09 UTC by Richard Llom
Modified: 2018-11-17 20:21 UTC (History)
3 users (show)

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Description Richard Llom 2014-11-21 14:09:48 UTC
Example PDF:
http://oneplus.net/downloads/presentations/oneplus-one-keynote.pdf
160 MB / 122 Slides

I wanted to view the above mentioned "heavy" presentation slide by slide. No fast scrolling through, but just a quick glance at every slide.
However this was not possible, because the rendering wasn't fast enough and I had to wait a little for each slide.

During the scrolling Okular used 100% CPU but only on one of my 4 CPU cores. So I was wondering if it wasn't possible to use more than one core?

My CPU: AMD Phantom X4 955 @ 3.2 GHz

Possible related bugs:
Okular:
bug 185908

Poppler: 
https://bugs.freedesktop.org/show_bug.cgi?id=50993
Comment 1 sebastian 2015-09-25 21:18:47 UTC
I think that you should vote on your bug. I am interested in your bug too
Comment 2 sebastian 2015-09-25 21:23:35 UTC
i am not a member, i too post my bugs
Comment 3 Rigo Wenning 2016-03-09 16:31:05 UTC
I can confirm this bug. I really wonder about okular's usage of the underlying framework. The QT framework should use all CPU
Comment 4 Sebastian 2018-11-17 20:21:03 UTC
Hey richard,

as you already noted yourself this is a very similar if not same wish as another wishlist report.

Unfortunately it seems that this is a very hard improvement that is not doable at the current state because the backends are not threadsafe.

I hope someone will someday work on this issue.
If you are interested yourself feel free to contribute and thank you very much for reporting this idea and trying to improve okular!

Note: I am no maintainer but from the KDE Bugsquad

*** This bug has been marked as a duplicate of bug 185908 ***