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[Bug 178325] New: Rebuild all thumbnails consumes large amounts of memory when processing at the end

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Marcus D. Hanwell

[Bug 178325] New: Rebuild all thumbnails consumes large amounts of memory when processing at the end

http://bugs.kde.org/show_bug.cgi?id=178325

Summary: Rebuild all thumbnails consumes large amounts of memory
when processing at the end
Product: digikam
Version: unspecified
Platform: Compiled Sources
OS/Version: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
AssignedTo: [hidden email]
ReportedBy: [hidden email]

Version: 0.10.0_beta6 (using Devel)
Compiler: GNU GCC 4.3.2
OS: Linux
Installed from: Compiled sources

I tried rebuilding all thumbnails on my photo collection today. It took quite a
long time and didn't seem to use both cores, but the main issue was right at
the end when progress was 100%. It said "Processing..." and consumed more and
more memory as I waited for it to complete. It got to the stage where it was
causing large amounts of swapping and the system became very unresponsive.

I had to kill digikam in order to regain control of my desktop session. When I
restarted digikam it seems like the thumbnails I built have been kept as
thumbnails are shown very quickly. I haven't looked at the relevant code yet
but I assume it was collecting the thumbnails up in some way. I am comfortable
with C++, Qt and KDE programming and would be happy to help debug this issue if
you have any ideas of where to start. I assume it is caused by the size of my
image collection and so debugging would require hours to get to that point
again.

My system is an AMD Athlon X2 dual core, 2GB of RAM and the photos reside on an
ext3 RAID5 partition. The thumbs were being generated on a separate partition
(/home/myuser/Pictures) where the photos have their own partition
(/home/photos). The photo partition has 74GB of used space, mixture of JPEG,
NEF and a few AVIs. I will upgrade to the latest beta to check if that helps at
all.

New digikam is looking great already. Thanks.

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Marcus D. Hanwell

[Bug 178325] Rebuild all thumbnails consumes large amounts of memory when processing at the end

http://bugs.kde.org/show_bug.cgi?id=178325

--- Comment #1 from Marcus D. Hanwell <marcus cryos org> 2008-12-21 02:15:01 ---
I wanted to confirm that after upgrading to 0.10.0_beta7 I observed the same
issue. Out of control memory consumption on the processing step. Sat at 100%,
it appears to process the same image over and over again - only one file name
in view. It is difficult to diagnose further as my system becomes extremely
unresponsive as it swaps madly.

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Gilles Caulier-4