[Digikam-devel] [Bug 172269] Digikam hangs for around 20-60 seconds when starting

[Marcel Wiesweg]

http://bugs.kde.org/show_bug.cgi?id=172269





--- Comment #15 from Marcel Wiesweg <marcel wiesweg gmx de>  2008-10-10 16:02:01 ---
In 0.9 the algorithm was:
Stat file names in dir, get file names from db, compare, scan new files.

In 0.10 it is:
Stat directory info (name + modification date),
get name+modification date from db, compare, scan new or changed files.

For an album with 500 images, my timing log is as follows:
Digikam::CollectionScanner::scanAlbum: Scanning album "/media/fotos/Mailand
2008"
 Digikam::CollectionScanner::scanAlbum: Checks and creating album 1
 Digikam::CollectionScanner::scanAlbum: List entries from database 36
 Digikam::CollectionScanner::scanAlbum: Arranged in hashes 1
 Digikam::CollectionScanner::scanAlbum: Stat'ing directory 1398
 Digikam::CollectionScanner::scanAlbum: Checked individual files 7

As you see, the only significant time spent is for stat'ing, which is for us
one line of code:
    const QFileInfoList list = dir.entryInfoList(d->nameFilters, QDir::AllDirs
| QDir::Files  | QDir::NoDotAndDotDot /*not CaseSensitive*/);

Command line "dir" can stat this directory in 200ms (<70ms with hot caches), so
Qt is doing stuff here that takes too much time.
Before I get to optimizing here however, I would like to know if you have
actually the same problem.


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