https://bugs.kde.org/show_bug.cgi?id=445176
Bug ID: 445176
Summary: Thumbnails generate very slow. Use all CPU cores to
generate them fast.
Product: gwenview
Version: unspecified
Platform: unspecified
OS: All
Status: REPORTED
Severity: wishlist
Priority: NOR
Component: general
Assignee: gwenview-bugs-n...@kde.org
Reporter: ofe...@nowaker.net
Target Milestone: ---
Created attachment 143349
--> https://bugs.kde.org/attachment.cgi?id=143349&action=edit
CPU usage 100% of a single core.
SUMMARY
I have a modern rig. My disks are PCIE with 4 GB/s read speed. My CPU is 10900K
with 20 cores. Thumbnails should generate fast but currently they don't because
Gwenview doesn't take advantage of multi-core processing.
STEPS TO REPRODUCE
1. Have modern hardware like Intel 10900K or AMD 5900X, and NVME 2TB/s+ disk.
2. Have a directory with hundreds of pictures that are 12-20 MP each.
3. Open the directory in thumbnail view.
OBSERVED RESULT
Thumbnails show up slowly, roughly at a rate of 10 thumbnails per second.
IO reads are low (max at around 100 MB/s). Far from the maximum.
CPU usage of Gwenview is 100% of a single core.
This means thumbnail generation speed is capped by the speed of a single core.
EXPECTED RESULT
Use all the compute power available to Gwenview by using all available cores to
generate thumbnails.
SOFTWARE/OS VERSIONS
N/A
ADDITIONAL INFORMATION
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