https://bugs.kde.org/show_bug.cgi?id=481643
Bug ID: 481643
Summary: Thumbnailing should be multi threaded on SSDs and
other fast devices
Classification: Applications
Product: dolphin
Version: 21.12.3
Platform: Debian stable
OS: Linux
Status: REPORTED
Severity: wishlist
Priority: NOR
Component: view-engine: icons mode
Assignee: dolphin-bugs-n...@kde.org
Reporter: simonp...@gmail.com
CC: kfm-de...@kde.org
Target Milestone: ---
SUMMARY
I have a modern Zen4 system with 48 threads and fast SSDs, and upon opening new
folders, I watch the thumbnailer thumbnail at about 4-5 100KiB pdfs at a time,
or 30-40 5MiB JPEGs at a time. Needless to say, this annoys me, since I can
watch the thumbails be generated in a single-threaded fashion. It would be
great to have an option to enable multi-threaded thumbnailing.
STEPS TO REPRODUCE
1. Have a folder full of many pdfs
2. Clear thumbnail cache
3. watch the thumbnail only use a single thread
OBSERVED RESULT
I watch the thumbnails pop in over 10-15 seconds depending on screen size in
linear order while cpu monitors show only a single core oactive
EXPECTED RESULT
All cores 100% active with low priority thumb-nailing when the filesystem is on
an SSD
ADDITIONAL INFORMATION
Obviously, care must be taken to not destroy HDD performance, and an option
should probably be added to disable it.
Originally brought up in
https://discuss.kde.org/t/multithreaded-preview-render/10686
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