[dolphin] [Bug 481643] 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

--- Comment #2 from simonpatp at gmail.com ---
It isn't quite comparable, but for reference:

$ time (sha1sum *.pdf)
real    0m0.430s
$ time (find . -name '*.pdf'  -type f -print0 | parallel -0 --line-buffer -j48
convert -thumbnail x64 -background white -alpha remove '{}[0]' '{}.png')
real    0m2.653s
$ time (for file in *.pdf; do convert -thumbnail x64 -background white -alpha
remove "${file}[0]" "${file%.pdf}.png"; done) 
real     1m5.721s
$ ls *.pdf | wc -l
470

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