[Digikam-devel] [Bug 289204] New: General performance problems because of lacking multithreading / multicore support

[Larx]

https://bugs.kde.org/show_bug.cgi?id=289204

           Summary: General performance problems because of lacking
                    multithreading / multicore support
           Product: digikam
           Version: 2.3.0
          Platform: openSUSE RPMs
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: general
        AssignedTo: digikam-devel at kde.org
        ReportedBy: bugzilla at go4more.de


Version:           2.3.0 (using KDE 4.7.3) 
OS:                Linux

The release announcement of Digikam 1.2.0 claims the implementation of
multithreading support. However, as of 2.3.0 very basic components of Digikam
still are seemingly lacking real multicore support for modern CPUs. 

This leads to (very...) poor performance especially when handling larger albums
with hi-res photos.

Examples (on a Phenom quadcore with 2.4 Ghz each core):

Thumbnail generation definitely only uses one processor core. If it is running
in the background, Digikam can get unusable for long periods of time. This is
especially annoying as simple operations like "changing time/date of photos"
lead to a void rebuild of the thumbnails. (Should I file this as a seperate
bug?)
- Time consuming effects (like local contrast) are obviously only single-core.
- In this I'm not quite sure, but sometimes viewing pictures takes so much time
that I wonder if the picture viewer is also only single threaded.

Generally I have the feeling that during Digikam operations only one processor
core is used most of the time (according to sysinfo plasmoid and top).

Reproducible: Didn't try

Steps to Reproduce:
Do anything that requires e.g. rebuilding thumbnails in a bigger album.

Actual Results:  
Digikam gets sluggish and hangs for minutes. Only one processor cores is
working, albeit at 100%.

Expected Results:  
Smoothly background workload done by all processor cores.

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