[Pkg-phototools-devel] Bug#855359: Bug#855359: darktable: 2.2.1 binary very slow compared to self-compiled

[David Bremner]

Matthias Bodenbinder <matthias at bodenbinder.de> writes:

> Am 28.02.2017 um 13:25 schrieb David Bremner:
>> Matthias Bodenbinder <matthias at bodenbinder.de> writes:

> 1) download this RAW file: http://www.mirada.ch/bench.SRW
> 2) the xmp file for my test is attached to this email (bench.SRW.xmp)
> 3) put both files in the same directory
> 4) disable opencl in the darktable GUI
> 5) run "darktable-cli bench.SRW test.jpg --core -d perf -d opencl"

I'm not able to reproduce the large difference between the debian
package and compiling with

 ./build.sh --disable-gnome-keyring --build-type Release

On my machine (an older i7), I get an average of 40s to export with
2.2.3-2 (compiled with -O3, just uploaded) and an average of 39s with
the build.sh produced binary.  In both cases the time is dominated by
the non-local means noise reduction (about 24s).

Looking only at the time in the equalizer module, the improvement is a
slightly larger (as a percentage) 7.9 seconds for build.sh versions 8.5
seconds for the debian package. Given we can't use -march=native or
-mtune=native, that's probably an acceptable slowdown.

d