Wasn't sure if DT may still have dependencies on system libraries that
it doesn't package.  I didn't have any specific ones in mind, just
grabbing at straws since relatively few people seem to be impacted by
this.
-Scott

On Wed, Jan 20, 2016 at 8:51 PM, Patrick Shanahan <p...@wahoo.no-ip.org> wrote:
> * Scott <spectre...@gmail.com> [01-20-16 23:36]:
>> Could it be that I'm running Ubuntu 14.04 and DT is using an older
>> library?  Is everyone else that uses Ubuntu running a more recent
>> version?
>> -Scott
>>
>> On Tue, Jan 19, 2016 at 9:05 PM, Scott <spectre...@gmail.com> wrote:
>> > With DT full screen, If I set the lighttable zoom to show 5 images
>> > across, it is rather slow (as previously mentioned).  If I leave it at
>> > that zoom level but re-size the darktable window within the window
>> > manager (so the images are smaller, but still 5 images across and same
>> > number of images shown in DT as before), the performance greatly
>> > improves.  I assume this is due to the same reason that the
>> > performance improves in full screen by zooming out.
>> >
>> > On Tue, Jan 19, 2016 at 8:31 PM, Scott <spectre...@gmail.com> wrote:
>> >> I ran 'darktable -d perf -d lighttable' to get the lighttable output
>> >> and sent it to a text file, opened up darktable and moved the cursor
>> >> around a bit, parsed the file to grab the lines with the total time,
>> >> '[lighttable] expose took #.#### sec', and output the maximum and mean
>> >> times listed.  Here are some results.
>> >>
>> >> 1.  54 pictures, all default settings -> max 0.14, average 0.07
>> >> 2.  Same library, turn off color managed thumbnails -> max 0.12, average 
>> >> 0.033
>> >> 3.  Same library, turn on color managed thumbnails, run
>> >> 'darktable-generate-cache -m 7' -> max 0.15, average 0.09
>> >> 4.  Reset darktable (remove ~/.cache/darktable and
>> >> ~/.config/darktable), import just 5 pictures, then run the same test
>> >> -> max 0.04, average 0.01
>> >>
>> >> It feels like the timing with the first tests is greater than 0.14
>> >> seconds, but my feeling is probably wrong.  Regardless, it is *very*
>> >> noticeable and the test does support my observations that turning off
>> >> color managed thumbnails improves the response a little bit, but not
>> >> drastically and that the response time is great with just 5 pictures
>> >> instead of ~50 pictures.
>> >>
>> >> I also tried playing with the option 'memory in megabytes to use for
>> >> the thumbnail cache' and the two memories related to tiling, but
>> >> neither seemed to have any noticeable effect.
>> >>
>> >> Are there any other tests I can do to help debug this?  Darktable is
>> >> great, but it is rather frustrating to use like this.
>> >>
>> >> -Scott
>> >>
>> >> On Mon, Jan 18, 2016 at 11:32 PM, johannes hanika <hana...@gmail.com> 
>> >> wrote:
>> >>> heya,
>> >>>
>> >>> sounds worrying, i'd like to get to the bottom of this.
>> >>>
>> >>> i guess the long term best solution would be to instruct cairo to only
>> >>> expose whatever thumbnails are changed when moving around with the
>> >>> mouse (but i tried quickly, it's not trivial to do and still work with
>> >>> all features).
>> >>>
>> >>> darktable -d perf -d lighttable
>> >>>
>> >>> is what you want to use to get timings for lighttable btw.
>> >>>
>> >>> -jo
>> >>>
>> >>> On Tue, Jan 19, 2016 at 5:45 PM, Scott <spectre...@gmail.com> wrote:
>> >>>> Hello all,
>> >>>>
>> >>>> I'm having an issue since upgrading to Darktable 2.0 (Pascal's PPA).
>> >>>> When in lighttable, if I just move my cursor around it takes ~1/3
>> >>>> second before the thumbnail under the cursor is highlighted and the
>> >>>> "image information" updates to it.  Searching the bug tracker and
>> >>>> archives show that I'm not the only one with this issue, but I haven't
>> >>>> seen any fixes for it.  A couple references:
>> >>>> http://redmine.darktable.org/issues/10764
>> >>>> http://sourceforge.net/p/darktable/mailman/message/34654461/
>> >>>>
>> >>>> I have:
>> >>>> - Ubuntu 14.04 LTS
>> >>>> - 16 GB of RAM
>> >>>> - GeForce GTX 650 Ti BOOST (proprietary drivers, )
>> >>>> - Intel Core i5-3570K (4 cores @ 3.40Ghz)
>> >>>> - All photos in my library are Canon CR2
>> >>>> - 27" monitor (Dell U2713HM) is calibrated using dipcalGUI and set to
>> >>>> 2560x1440 resolution
>> >>>>
>> >>>> The first few things I've tried:
>> >>>> - Running darktable-generate-cache
>> >>>> - Running with '-d perf' (but it doesn't print anything when I simply
>> >>>> move the mouse around the screen)
>> >>>> - Changing the number of background threads
>> >>>> - Running with and without OpenCL
>> >>>> - Turning off color managed cache (this gave a slight improvement, but
>> >>>> still much slower than DT 1.6.9)
>> >>>>
>> >>>> I then deleted ~/.cache/darktable and  ~/.config/darktable, and
>> >>>> imported only 5 pictures and the response time seemed very quick.  I
>> >>>> then added a folder (50 images) and the response time lagged again.  I
>> >>>> also noticed that it seems to depend on how zoomed in the images are
>> >>>> in lighttable.  If I zoom out so the thumbnails are very small, then
>> >>>> the response time is good.  As I zoom the thumbnails larger, this
>> >>>> response time gets worse and worse.  5 images across the screen seems
>> >>>> to be the worst, and then as I zoom in even closer it gets slightly
>> >>>> better.
>> >>>>
>> >>>> I then imported some more pictures so that I have nearly 200 in the
>> >>>> database/cache.  Now even when lighttable is zoomed as as far as
>> >>>> possible, the response time is very slow.
>> >>>>
>> >>>> Possible output request:
>> >>>> $ ldd `which darktable` | grep gomp
>> >>>> libgomp.so.1 => /usr/lib/x86_64-linux-gnu/libgomp.so.1 
>> >>>> (0x00007fa6da138000)
>> >>>>
>> >>>> Does anyone have any other recommendations to try?
>> >>>>
>> >>>> Thanks,
>> >>>> Scott
>> >>>>
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>
>
> If you installed a pre-packaged version 2.0 of darktable, why would you
> thing you were using an "older library"?  And which library are you
> referring?
>
> --
> (paka)Patrick Shanahan       Plainfield, Indiana, USA          @ptilopteri
> http://en.opensuse.org    openSUSE Community Member    facebook/ptilopteri
> http://wahoo.no-ip.org        Photo Album: http://wahoo.no-ip.org/gallery2
> Registered Linux User #207535                    @ http://linuxcounter.net
>
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