[dolphin] [Bug 481643] New: Thumbnailing should be multi threaded on SSDs and other fast devices

[bugzilla_noreply at kde.org]

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-null at kde.org
          Reporter: simonpatp at gmail.com
                CC: kfm-devel at 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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