Am Montag, 16. März 2015, 22:21:01 schrieb Matthieu Moy: > "Matt Kitcat" <m...@elmtreecottages.co.uk> writes: > > So I have done some very rough testing on an intel i5 4 core machine with > > an Nvidia gt610 graphics card and 8 gb ram on Fedora 21 64 bit. > > > > To render a canon 40D raw file to openEXR 2900 pixel wide 2:235 aspect > > crop with a default base curve it takes about 3.5 seconds with > > opencl=false in darktablerc. Weirdly it takes longer with opencl=true. > > I'm not so surprised. I'm having a ~4X speedup with my graphics card > compared to an i5, and according to > http://gpuboss.com/gpus/Radeon-R9-270X-vs-GeForce-GT-610 it's 18X faster > than yours for floating-point performance. > > If your goal is to maximize the performance for a batch with many > images, I guess the optimal would still be to run a few images with > OpenCL and the others on your CPU, to use both at the same time.
Right, you (Matt) could try to start a first export with opencl enabled as a background thread and then immediately a 2nd one without opencl and see if that improves things. > But ultimately, if you want something really fast, you'll have to invest > in a better GPU. Tobias
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