Am Montag, 2. Dezember 2013, 22:29:42 schrieb Christian Kanzian: > Am Montag, 2. Dezember 2013 schrieb malenki: > > I am going to purchase a graphics adapter mainly (or only) to use it > > for OpenCL stuff, a big part of it being darktable. > > > > Now I cannot decide if I should get either a > > Radeon HD 7870 (2GB memory, ~150 EUR) or a > > Radeon HD 7970 (3GB memory, ~215 EUR; about 1,5 times faster than the > > 7870)¹ > > > > Would the speed of the faster device be noticeable when interacting with > > the UI? > > My poor guess. > You want even notice the speed difference. Maybe during export using denoise > or something demanding like that. > > > hope you can help me to decide ;) > > Thomas > > > > ¹ http://compubench.com/compare.jsp?config_0=11905561&config_1=11975486 > > Both are 5-10x faster than my Nvidia GT 640. > > A simple (stupid) darktable opencl benchmark script will be nice. I mean > processing the same image via cli and have some output which could be > copy&paste to the wiki? > But I don't know howto do that at the moment.
First you need a publicly available RAW file + XMP so the results are at least kind of comparable. Then you can get benchmarking data using darktable-cli <RAW file> <XMP file> i_want_to_benchmark_opencl_in_darktable.ppm --width 0 --height 0 --hq 1 --core -d opencl -d perf Rerun a few times to not measure disk and cache performance. It would probably still be CPU dependent. So use as few modules as possible that don't have an OpenCL codepath. No idea if this would be useful, but at least you now know how to get the data. :-) > Christian Tobias
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