[Bug 277257] New: Lousy performance when moving images inside digikam

[Simon-2]

https://bugs.kde.org/show_bug.cgi?id=277257

           Summary: Lousy performance when moving images inside digikam
           Product: digikam
           Version: 1.9.0
          Platform: Debian testing
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: [hidden email]
        ReportedBy: [hidden email]


Version:           1.9.0 (using KDE 4.6.4)
OS:                Linux

I select 120 images and move them to a different folder on the _same_
partition.
* 0.5 s when done in dolphin
* 60 s when done in digikam
Half a second for one image? This is quite some time. I also wait 5 s when
moving 10 images. Why is this?

I'm on a Core2Duo 3.16 GHz, Samsung F4 EG (2 TB).

Reproducible: Always

Steps to Reproduce:
Move files.


Expected Results:  
...

OS: Linux (x86_64) release 2.6.39-2.slh.1-aptosid-amd64
Compiler: gcc

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[Gilles Caulier-4]

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--- Comment #1 from Gilles Caulier <caulier gilles gmail com>  2011-07-07 05:11:03 ---
There is no reason for that. In both case, KDE KIOSlave are used in
background...

Also, it's not reproducible on my computer (digiKam 2.0.0 RC)

Gilles Caulier

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[Simon-2]

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--- Comment #2 from Simon <simon eu gmail com>  2011-07-07 05:41:31 ---
I'll test again when 2.0 is out. Cannot explain it either; it is the same when
renaming or deleting pictures as well.
Is it maybe related to thumbnail generation which digikam tries to run at the
same time? I just noticed that the first few images are renamed very quickly,
then it again takes 0.5 s per image (and the album view constantly changes).

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[Gilles Caulier-4]

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--- Comment #3 from Gilles Caulier <caulier gilles gmail com>  2011-07-07 06:46:34 ---
If it's the case, it's abnormal. Thumbs are generated in a separated thread, it
don't must slowdown GUI. Here it's not the case (single our double core
computer)

Run kdebugdialog and turn on digiKam debug space including kioslave and kexiv2
and kdcraw. run digiKam in a console and look trace.

Also, which image format you use ? JPEG or RAW ?

Gilles Caulier

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[Simon-2]

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--- Comment #4 from Simon <simon eu gmail com>  2011-07-07 07:50:03 ---
Created an attachment (id=61665)
 --> (http://bugs.kde.org/attachment.cgi?id=61665)
Moving files: Debug output log

Moved around 50 files. Hope the log is useful.

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[Simon-2]

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--- Comment #5 from Simon <simon eu gmail com>  2011-07-07 07:50:35 ---
And, the images were JPG usually.

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Gilles Caulier <[hidden email]> changed:

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          Component|general                     |Database




--- Comment #6 from Gilles Caulier <caulier gilles gmail com>  2011-07-08 11:59:27 ---
At each file moved, KDE API fired an event through KDirWatch to brind digiKam
database about new file to parse and registered. It can take a while. This can
explain the difference with Dolphin.

On my computer (double core), the difference is not too big. At least, it take
more time, sure, but it's not like in your computer.

But i'm use digiKam 2.0.0 RC. We probably improve this behavior (more than one
year of development). If you can, please try this version on your computer.

Thanks in advance

Gilles Caulier

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[S. Burmeister]

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--- Comment #7 from S. Burmeister <sven burmeister gmx net>  2011-07-08 12:27:26 ---
I also often have the feeling that digikam writes to the database after each
step it takes. E.g. if one has a folder of new images. Instead of first reading
all thumbnails and displaying them. It feels like digikam writes the thumbnail
to the database/hdd after each picture – which of course slows the displaying
of the thumbnails down.

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[Marcel Wiesweg]

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--- Comment #8 from Marcel Wiesweg <marcel wiesweg gmx de>  2011-07-11 16:37:34 ---
Simon: Is significant CPU usage involved for any process?

Sven: Yes, it writes each newly generated thumbnail to db immediately. (one
time ever per picture). Of course, SQlite is very slow with a write operation.
Here MySQL will be superior.

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--- Comment #9 from Gilles Caulier <caulier gilles gmail com>  2011-12-15 08:49:38 ---
Simon,

Do you see comment #8 from Marcel ?

Gilles Caulier

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--- Comment #10 from Gilles Caulier <[hidden email]> ---
Do you use mysql or sqlite database ?

Gilles Caulier

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--- Comment #11 from Gilles Caulier <[hidden email]> ---
We need a fresh feedback using last digiKam 4.2.0

Gilles Caulier

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[Michael G. Hansen]

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Michael G. Hansen <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Lousy performance when      |Bad performance when moving
                   |moving images inside        |images inside digikam
                   |digikam                     |
                 CC|                            |[hidden email]

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[Simon-2]

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--- Comment #12 from Simon <[hidden email]> ---
Can only test on 3.5 right now. Would this help as well?

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--- Comment #13 from Gilles Caulier <[hidden email]> ---
It's better than nothing.

But last stable 4.2.0 is out and it will be better to switch to 4.x series,
where a lots of bugs have been fixed.

Gilles Caulier

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Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Bad performance when moving |CORE : bad performance when
                   |images inside digikam       |moving images inside
                   |                            |digiKam collections

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[Gilles Caulier-4]

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--- Comment #14 from Gilles Caulier <[hidden email]> ---
Simon,

Any feedback ?

Gilles Caulier

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           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
   Version Fixed In|                            |5.0.0
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #15 from [hidden email] ---
With 5.0.0, we drop KIOSlave and replace DB access to a pure multi-threaded
interface, which is more faster and efficient.

We have also drop the KDirWatch API in favor of QFileSystemWatcher.

This king of problem with 5.0.0 is not reproducible with SQlite database.

I close this file now.

Gilles Caulier

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           What    |Removed                     |Added
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          Component|Database                    |Database-Scan

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