[Digikam-devel] [Bug 218633] "Write Metadata to Selected Images" Very Slow for Large Number of Images

[Andreas Huggel]

https://bugs.kde.org/show_bug.cgi?id=218633





--- Comment #10 from Andreas Huggel <ahuggel gmx net>  2010-04-30 13:55:48 ---
Exiv2 0.19 has a known performance issue with images from some Nikon SLRs. It
is _very_ slow for these. Images from any other cameras are not affected.

Just from reading the descriptions above, comment #7 might be related to this
problem, and it should be easy to determine whether that is really the case. If
it is, upgrading to exiv2 from SVN trunk will help.

For any other (new) performance issue, if you think it is related to exiv2,
please narrow the test down to exiv2 and report to the exiv2 bugtracker at
dev.exiv2.org preferably.

A simple test could be to run a more or less complex update command over a
number of images, e.g., something like this:

$ time exiv2 -M'set Exif.Image.ImageDescription Some description' *.jpg

and compare with the time digiKam takes for a similar operation and with the
time a simple cp takes to just copy the files within the same directory.
Ideally, they should all be pretty close with cp-time < exiv2-time <
digiKam-time

Andreas

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