Experiences running 8.0.0 AppImage on Ubuntu Lunar (23.04)
jik at kamens.us
Tue Mar 28 14:22:15 BST 2023
I decided to try out the 8.0.0 pre-release AppImage on the three
machines on which I use digiKam, because I was unable to run 7.9.0 or
7.10.0 on these machines because it kept segfaulting.
I eventually was able to get digiKam to launch on all three machines,
but there was some bumps and challenges along the way which I am sharing
here because this might be useful to the developers, and because it
would be interesting to hear if others have run into similar issues.
On laptop1, digiKam started, but it took several minutes to start up
each time, during most of which the splash screen was displaying
"Loading tools..." and the app appeared to be talking to the database an
awful lot. The first time seemed longer. Strace output from that first
invocation (access to thumbnails DB) seemed to suggest that perhaps it
was regenerating all thumbnails on startup.
On laptop2, the first time I started it, it did nothing for several
minutes and then popped up a message which said, "You have insufficient
privileges on the database. Following privileges are not assigned to
you: [this is blank, no privileges are listed] Check your privileges on
the database and restart digiKam."
The second time, it got to the splash screen, but got stuck there for a
very long time, like a half hour, much longer than on laptop1. Judging
by what showed up in top and strace, there were short bursts where the
digikam process was busy and talking to the database, interspersed with
longer periods during which it was idle while waiting for something. The
timestamp on my thumbnails-digikam.db file kept getting updated, so I
suspect that it was rebuilding the thumbnail database, in which case the
delays may have been lags talking to the fileserver that the pictures
are on. Having said that, I'm not sure why the delays are so much longer
on this machine than on the other machine that was also doing this over
WiFi to the same fileserver, unless for some reason this particular
laptop has slower connectivity to the fileserver than the other one.
This does seem possible since I noticed when mounting the filesystem on
this machine that the mount took much longer.
Also on laptop2, the splash screen is much smaller than it should be and
the fonts on the splash screen are so small that they are virtually
unreadable. I thought this might be an Xorg fractional scaling issue
since that's a new feature and I believe still experimental, but I
turned off fractional scaling and restarted digiKam and saw the same
issue, and then I logged out and logged back in with Wayland and again
saw the same issue.
When it finally started up, it popped up the dialog telling me it needed
to download facial recognition files, but clicking the "Download" button
seemed to have no effect at least for a while, and GNOME kept popping up
its ""digikam" is not responding, Force Quit / Wait" dialog window. The
download finally happened and then the main window interface was responsive.
The third time I started up digiKam on laptop2, it still took a while at
"Loading tools..." but much less time and the timestamp on my thumbnails
DB wasn't being updated. Other things I noticed:
* After the splash screen went away there was like a 15-second delay
before the main window came up.
* After closing the main window there was like a 15-second delay
before the digikam process (which I launched by executing the
AppImage file) fully exited.
Finally, on my primary desktop computer, which is connected to the
fileserver via cable rather than wifi and therefore has much faster
connectivity, digiKam started up fast without any apparent issue. Since
I've run digiKam here more recently than on the laptops, it's possible
that the thumbnail database didn't need to rebuild here, i.e., my
suspicion that there was something in the upgrade to 8.0.0 that caused
the thumbnail DB to need rebuilding may be incorrect.
Hope this is useful.
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