https://bugs.kde.org/show_bug.cgi?id=426086
Bug ID: 426086
Summary: Tiff file reading extremely slow
Product: digikam
Version: 7.1.0
Platform: Other
OS: Microsoft Windows
Status: REPORTED
Severity: minor
Priority: NOR
Component: Plugin-FilesIO-TIFF
Assignee: digikam-bugs-n...@kde.org
Reporter: k...@binkmail.com
Target Milestone: ---
SUMMARY
Using current Win64 weekly. Observed while rebuilding face thumbnails in
background. Assume it is a general tiff reading problem. Tiff files were saved
from photoshop cc 21.2.
STEPS TO REPRODUCE
1. Maintenance clean thumbnails which wipes face thumbnails.
2. View faces to trigger thumbnail rebuild.
3. Observe disk usage
OBSERVED RESULT
Tiff files are read at about 4MB/s with almost 100% disk active time. Panasonic
RAW files (for example) on the same drive are read at about 60MB/s with about
12% disk active time.
Using sysinternals diskmon I noted that the tiff files were being read in 64k
blocks backwards, that is the read sector numbers got lower. RAW files were
read in 256k blocks with increasing sector numbers. I assume the terrible
performance is due to lack of OS and/or drive read ahead caching because
digikam is reading behind - lol. The tiff files are about 450MB. Don't know if
digiKam needs to read the whole file if so it would take nearly 2 minutes each.
EXPECTED RESULT
Tiff reading not to be so slow.
SOFTWARE/OS VERSIONS
Windows: 10
ADDITIONAL INFORMATION
Think this might be some specific tiff file format? The files were probably
initially created with DxO Photolab then edited and saved in photoshop.
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