[Digikam-devel] [Bug 216894] New: Slow quadratic runtime generating fingerprints or thumbnails in beta6 during a big import

[Scott Crosby]

https://bugs.kde.org/show_bug.cgi?id=216894

           Summary: Slow quadratic runtime generating fingerprints or
                    thumbnails in beta6 during a big import
           Product: digikam
           Version: unspecified
          Platform: Debian testing
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: digikam-devel at kde.org
        ReportedBy: scrosby at cs.rice.edu


Version:           1.0.0beta6 (using KDE 4.3.2)
OS:                Linux
Installed from:    Debian testing/unstable Packages

Slow quadratic runtime generating fingerprints or thumbnails in beta6 during a
big import


I am importing about 50k images by pointing digikam at an already-made
directory tree, and digikam works great! However, in order to find
duplicates digikam must generate fingerprints. When doing this, the
program gets progressively slower. I suspect that this is because the
progress dialog continously grows the list of images, never rolling
the first entries off of the list. As the dialog auto-scrolls to the
bottom on every update, it is virtually impossible to see any entries
EXCEPT the last few. This causes digikam to get progressively slower
and slower. After a few thousand images, it is >5x slower.

If I abort fingerprint generation and try to restart and 'scan' for
images that need fingerprints, digikam remains slow.  However, if I
quit digikam entirely and restart and then have it 'scan', then it
generates fingerprints at full speed.... for a while, until the
quadratic slowdown hits again.

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