[Okular-devel] [okular] [Bug 341161] New: Utilize more than one CPU core

[richardlm]

https://bugs.kde.org/show_bug.cgi?id=341161

Bug ID: 341161
Summary: Utilize more than one CPU core
Product: okular
Version: 0.20.60
Platform: Chakra
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: PDF backend
Assignee: okular-***@kde.org
Reporter: ***@gmail.com

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

[sebastian]

https://bugs.kde.org/show_bug.cgi?id=341161

sebastian <***@outlook.com> changed:

What |Removed |Added
----------------------------------------------------------------------------
CC| |***@outlook.com

--- Comment #1 from sebastian <***@outlook.com> ---
I think that you should vote on your bug. I am interested in your bug too

[sebastian]

https://bugs.kde.org/show_bug.cgi?id=341161

--- Comment #2 from sebastian <***@outlook.com> ---
i am not a member, i too post my bugs

[Rigo Wenning via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=341161

Rigo Wenning <***@w3.org> changed:

What |Removed |Added
----------------------------------------------------------------------------
CC| |***@w3.org

--- Comment #3 from Rigo Wenning <***@w3.org> ---
I can confirm this bug. I really wonder about okular's usage of the underlying
framework. The QT framework should use all CPU

[Sebastian]

https://bugs.kde.org/show_bug.cgi?id=341161

Sebastian <***@tum.de> changed:

What |Removed |Added
----------------------------------------------------------------------------
Status|REPORTED |RESOLVED
CC| |***@tum.de
Resolution|--- |DUPLICATE
Keywords| |investigated, triaged
Severity|normal |wishlist

--- Comment #4 from Sebastian <***@tum.de> ---
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 ***