Review Request 112417: FIX: 283022 - Performance with large feed (6000 items) very poor

[Commit Hook]

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This review has been submitted with commit a5b0f2afe1b62de636798b7452e4e3abae86db72 by Frank Meerkötter to branch master.

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On Aug. 31, 2013, 7:16 p.m., Frank Meerkoetter wrote:
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> (Updated Aug. 31, 2013, 7:16 p.m.)
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> 
> Review request for Amarok.
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> Description
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> Using callgrind it was very visible that amarok is spending an enormous amount of time to turn podcast episodes into tracks.
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> Initially i noticed that the PlaylistBrowserModel is calling Playlist::tracks().count() while it should be calling Playlist::trackCount().
> Constructing a list of tracks is expensive for the case of Podcasts (as internally podcast episodes are converted into tracks which
> get added to a new list). This change already improved the situation a bit, but the UI was still sluggish. Callgrind was still showing
> that we are turning episodes into tracks - over and over.
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> To fix that i added a cache to the PodcastChannel. As long as the episodes haven't changed, there is no point in constructing
> a new list of tracks each time tracks() is called.
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> With that second fix the UI is now pretty useable.
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> Diffs
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>   src/browsers/playlistbrowser/PlaylistBrowserModel.cpp 281694a 
>   src/core-impl/podcasts/sql/SqlPodcastMeta.h 02a18d3 
>   src/core-impl/podcasts/sql/SqlPodcastMeta.cpp 20bcaff 
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> Diff: http://git.reviewboard.kde.org/r/112417/diff/
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> Testing
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> Tested with http://www.justing.com.cn/justpod/justpod_ch.xml
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> 
> Thanks,
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> Frank Meerkoetter
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