Review Request: Implemented multithreading in KFileItemModelSortAlgorithm

[Emmanuel Pescosta]

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http://git.reviewboard.kde.org/r/107025/
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Review request for Dolphin and Frank Reininghaus.


Description
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Implemented multithreading in KFileItemModelSortAlgorithm.

If more than 100 items to sort and ideal thread count is greater than 1 -> sort them with parallelSort (2 Threads)

Use maximal 2 Threads, because more than 2 Threads are "slower" (more overhead than speed up). (I also have a patch which uses n Threads for sorting, if you want test it ;)


Diffs
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  dolphin/src/kitemviews/private/kfileitemmodelsortalgorithm.h 3a596df 
  dolphin/src/kitemviews/private/kfileitemmodelsortalgorithm.cpp e0aac13 

Diff: http://git.reviewboard.kde.org/r/107025/diff/


Testing
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About 2 seconds faster with sorting 500.000 files.
About 5 seconds faster with sorting 1.000.000 files.


Thanks,

Emmanuel Pescosta

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