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[Bug 151122] New: Opening Albums Has Become Very Slow

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John Goerzen

[Bug 151122] New: Opening Albums Has Become Very Slow

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http://bugs.kde.org/show_bug.cgi?id=151122
Summary: Opening Albums Has Become Very Slow
Product: digikam
Version: 0.9.2
Platform: Debian testing
OS/Version: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
AssignedTo: digikam-devel kde org
ReportedBy: jgoerzen complete org

Version: 0.9.2 (using KDE KDE 3.5.7)
Installed from: Debian testing/unstable Packages
OS: Linux

This problem did not exist in 0.9.1. It began with 0.9.2 and is still present in 0.9.3 beta.

Sometime after upgrading to 0.9.2, digikam got REALLY slow on big albums
-- or tags that selected lots of photos. top showed kio_digikamalbum
using resources, and stracing it revealed that it was reading every byte
of every file in the album. It did that before displaying anything
about the album's contents. That is, it wasn't just rebuilding
thumbnails. It also is not faster on subsequent access attempts.

My photos are on a local XFS filesystem. They used to be on a local ext3 filesystem, which exhibited the same problem.
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Arnd Baecker

[Bug 151122] Opening Albums Has Become Very Slow

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http://bugs.kde.org/show_bug.cgi?id=151122

------- Additional Comments From arnd.baecker web de 2007-10-21 08:56 -------
Created an attachment (id=21883)
--> (http://bugs.kde.org/attachment.cgi?id=21883&action=view)
part of the strace

Hi,

I don't experience the problem, so what do you mean by
"big albums", i.e. how many entries are there?

Also, I had a look at the output of strace, i.e. using
strace -o/tmp/strace.txt digikam
which is pretty overwhelming
(Even if nothing is done inside of digikam one gets a loop of:
gettimeofday({1192949034, 900696}, NULL) = 0
select(21, [3 5 7 9 12 13 14 15 16 17 18 19 20], [], [], {0, 95}) = 0
(Timeout)
gettimeofday({1192949034, 904522}, NULL) = 0
stat64("/home/abaecker/Pictures", {st_mode=S_IFDIR|0755, st_size=4096,
...}) = 0
gettimeofday({1192949034, 904786}, NULL) = 0
gettimeofday({1192949034, 904832}, NULL) = 0
gettimeofday({1192949034, 904856}, NULL) = 0
gettimeofday({1192949034, 904914}, NULL) = 0
)
Anyway, concerning reading every file: I have an album with
174 images, of which the first 4 are visible in the
album view, and only for these (apart from the initial scan during start-up)
I find an access to the file (see the attachment).
So this suggests to me (but I might be completely wrong)
that only the first few are accessed
(whether they are completely read or not is
beyond my capabilities to interpret the output of strace ...)

Arnd
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John Goerzen