[Bug 296768] New: when creating thumbnails, digiKam uses 80% CPU - quadcore 3800, 9GB RAM

[Axel Krebs]

https://bugs.kde.org/show_bug.cgi?id=296768

            Bug ID: 296768
          Severity: major
           Version: 2.5.0
          Priority: NOR
          Assignee: [hidden email]
           Summary: when creating thumbnails, digiKam uses 80% CPU -
                    quadcore 3800, 9GB RAM
    Classification: Unclassified
                OS: other
          Reporter: [hidden email]
          Hardware: Ubuntu Packages
            Status: UNCONFIRMED
         Component: Albums GUI
           Product: digikam

User-Agent:      
Build Identifier:

when creating my thumbnail database, digikam sucks about 80% power on a fast
quadcore (9 GB RAM)- why?

This seems to be heavily wrong- can someone help to turn my machine operatable
again??

Reproducible: Always

Steps to Reproduce:
1. just start Extras -> "alle Vorschaubilder neu erzeugen"
2.
3.


Expected Results:  
should run even in backround with loading under 10-20 %!

If someone need further info, please let me know.

I take this for a sevre malfunction, as it limits regular operation on a strong
machine unacceptable!

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[Francesco Riosa-2]

https://bugs.kde.org/show_bug.cgi?id=296768

Francesco Riosa <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEEDSINFO
                 CC|                            |[hidden email]
         Resolution|---                         |WAITINGFORINFO

--- Comment #1 from Francesco Riosa <[hidden email]> ---
A modern linux should be very responsive with only 80% load, what it can make
it slow is exceed memory and so start using swap or disk usage.
Anyway try:
ionice 3 nice digikam
to make it use only spare cpu and disk to see if help

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[Gilles Caulier-4]

https://bugs.kde.org/show_bug.cgi?id=296768

Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[hidden email]

--- Comment #2 from Gilles Caulier <[hidden email]> ---
For me, this is not reproducible here (i5 computer). Cleaning all thumbnails
DB, and rebuild it (250 Gb of images) do not break computer like this. It still
suitable as well.

Gilles Caulier

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[Marcel Wiesweg]

https://bugs.kde.org/show_bug.cgi?id=296768

--- Comment #3 from Marcel Wiesweg <[hidden email]> ---
I would see it as a bug if digikam only uses 20% for a CPU-intensive task -
that means it does not use the available hardware.
Now thumbnail regeneration is older code, multithreaded but not prepared for
multicore. In fact, there is only one thread. (code can be optimized by
removing the need to generate a pixmap - this is only a toy for the progress
dialog - and using the prepare... method).

So while I would like to see the thumbnail creation make use of all you four
core, it cannot at the moment, and a load of 80% means load on all four cores.
Which tool did you use to measure per-process or per-thread CPU use?

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[Axel Krebs]

https://bugs.kde.org/show_bug.cgi?id=296768

--- Comment #4 from Axel Krebs <[hidden email]> ---
Under Kubuntu 11.10, I use system Monitor, showing only "CPU". It
appears to be an average value of the overall load.

If possible, I´d linke to provide more detailed information- just don´t
know, how.

Axel

Am 26.03.2012 21:39, schrieb Marcel Wiesweg:

> https://bugs.kde.org/show_bug.cgi?id=296768
>
> --- Comment #3 from Marcel Wiesweg <[hidden email]> ---
> I would see it as a bug if digikam only uses 20% for a CPU-intensive task -
> that means it does not use the available hardware.
> Now thumbnail regeneration is older code, multithreaded but not prepared for
> multicore. In fact, there is only one thread. (code can be optimized by
> removing the need to generate a pixmap - this is only a toy for the progress
> dialog - and using the prepare... method).
>
> So while I would like to see the thumbnail creation make use of all you four
> core, it cannot at the moment, and a load of 80% means load on all four cores.
> Which tool did you use to measure per-process or per-thread CPU use?
>

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[Axel Krebs]

https://bugs.kde.org/show_bug.cgi?id=296768

--- Comment #5 from Axel Krebs <[hidden email]> ---
Dilles:

what specific info do you need for reproducing?

By the way: what is "suitable" for your understanding? if you make one
single click and you have to wait for seconds before reaction- if any?


Axel

Am 25.03.2012 23:20, schrieb Gilles Caulier:

> https://bugs.kde.org/show_bug.cgi?id=296768
>
> Gilles Caulier <[hidden email]> changed:
>
>            What    |Removed                     |Added
> ----------------------------------------------------------------------------
>                  CC|                            |[hidden email]
>
> --- Comment #2 from Gilles Caulier <[hidden email]> ---
> For me, this is not reproducible here (i5 computer). Cleaning all thumbnails
> DB, and rebuild it (250 Gb of images) do not break computer like this. It still
> suitable as well.
>
> Gilles Caulier
>

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[Axel Krebs]

https://bugs.kde.org/show_bug.cgi?id=296768

--- Comment #6 from Axel Krebs <[hidden email]> ---
Francesco,

what is "ionice 3 nice digikam"?

I have no idea. So sorry.


Axel
Am 25.03.2012 23:16, schrieb Francesco Riosa:

> https://bugs.kde.org/show_bug.cgi?id=296768
>
> Francesco Riosa <[hidden email]> changed:
>
>            What    |Removed                     |Added
> ----------------------------------------------------------------------------
>              Status|UNCONFIRMED                 |NEEDSINFO
>                  CC|                            |[hidden email]
>          Resolution|---                         |WAITINGFORINFO
>
> --- Comment #1 from Francesco Riosa <[hidden email]> ---
> A modern linux should be very responsive with only 80% load, what it can make
> it slow is exceed memory and so start using swap or disk usage.
> Anyway try:
> ionice 3 nice digikam
> to make it use only spare cpu and disk to see if help
>

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[Francesco Riosa-2]

https://bugs.kde.org/show_bug.cgi?id=296768

Francesco Riosa <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDSINFO                   |RESOLVED
         Resolution|WAITINGFORINFO              |WORKSFORME

--- Comment #7 from Francesco Riosa <[hidden email]> ---
(In reply to comment #6)
> Francesco,
> what is "ionice 3 nice digikam"?
> I have no idea. So sorry.

ionice - set or get process I/O scheduling class and priority
  (make the acces to the disk of a particular program wait for other processes
finish their work)
nice - run a program with modified scheduling priority
  (make the usage of the cpu of a particular program wait for other processes
to do their work)
basically composing the command like that digikam will be the last to use disk
and cpu
you may need to install them and to launch digikam from the command line (a
shell)

Axel, this very much seem a system problem, more than a digikam problem.
you may be more lucky in the ubuntu forums, possibly
http://ubuntuforums.org/forumdisplay.php?f=331

try asking there specifying the kubuntu version, the file system used for
/home, maybe the digikam version, and other programs which are running at the
same time

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https://bugs.kde.org/show_bug.cgi?id=296768

[hidden email] changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|AlbumsView                  |Thumbs-Engine

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