[Digikam-devel] [Bug 149485] Advanced image resize for the digikam editor

Joe Auman brain.recall at gmail.com
Tue Jun 2 23:27:27 CEST 2009


https://bugs.kde.org/show_bug.cgi?id=149485


Joe Auman <brain.recall at gmail.com> changed:

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                 CC|                            |brain.recall at gmail.com




--- Comment #204 from Joe Auman <brain recall gmail com>  2009-06-02 23:27:13 ---
(In reply to comment #187)
> Parallelising the the energy computation and the seam removal in LqR can be
> done right away (a single OpenMP pragma is enough): I have now tried to
> parallelise the carving operation and, to my surprise, I actually got a
> performance loss. I have tested this on 2 and 4 core PC's and my results are
> that more threads -> less performance, suggesting that the overhead cost for
> this  operation is too high. I could still try something a little more
> sophisticated, though.

Hi Carlo. Your results kind of alarmed me, so I went back and checked over some
things. It's been quite awhile since I multithreaded Energy_Map(), so I rebuilt
it running without any threads. To my surprise, I gained a significant
performance boost. I hope I haven't wasted too much of your time on this.

At this point I'm out of ideas.

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