[Kde-pim] Review Request: Optimize ChangeRecorder to only update 8 bytes on disk when dequeuing.

[David Faure]

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http://git.reviewboard.kde.org/r/106950/
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Review request for Akonadi, Volker Krause and Andras Mantia.


Description
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Optimize ChangeRecorder to only update 8 bytes on disk when dequeuing.

Rather than saving the whole file (of pending notifications) every
time, just because the first item was dequeued. This reduces disk I/O
considerably, and speeds up processing (especially in the nepomuk
feeder). In the IMAP resource (when marking 2000 emails as read) I
couldn't time a difference since it's mostly network-based anyway.
But at least the disk is usable by other processes meanwhile ;)


This addresses bug 300572.
    http://bugs.kde.org/show_bug.cgi?id=300572


Diffs
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  akonadi/changerecorder.cpp c3d3640679a9a679449fa6f0ce1a34a9d79cf351 
  akonadi/changerecorder_p.h 1100579aaa6beb53725bb5fc96e2e5c356cbab54 
  akonadi/changerecorder_p.cpp 6582ba4e8391bf77686e4feabf06b4bdf6c1bfc3 

Diff: http://git.reviewboard.kde.org/r/106950/diff/


Testing
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changerecorder and monitornotification unit tests [is there any other that might apply?]
Applying the patch and restarting akonadi (existing files get converted to new format).
Running with the patch for a few days.
Marking 2000 emails as read.
Watching nepomukfeeder process all pending notifications.


Thanks,

David Faure

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