Am 24.04.2013 07:05, schrieb Janne Kurri: > > Ok. Another question: how is processing handled in darkroom mode with > multiple devices, would center and preview images be done > simultaneously with two devices? Or does one wait for the other to > complete before starting? Same with thumbnail generation, are they done > one by one? What I'm getting at with this is if it actually makes sense > to use a second gpu if there's a quick-ish cpu available as it doesn't > seem like there's a lot to do for that second gpu.
When looking for a processing device darktable always takes any available GPU before falling back to CPU. Center view image and preview image are frequently processed in parallel (at any module parameter change). Therefore if you have two GPU devices both will be used in parallel. If one is slower than your CPU in fact you lose processing speed. When generating thumbnails you can adjust how many parallel processes you want to have (core options: number of parallel threads). In your situation with 1 fast CPU, 1 fast GPU, 1 slow GPU you might get a little bit of improvement if you select three, but only if there are a lot of thumbs to be generated. General recommendation: don't use a slow GPU with OpenCL if you have a fast CPU. Ulrich ------------------------------------------------------------------------------ Try New Relic Now & We'll Send You this Cool Shirt New Relic is the only SaaS-based application performance monitoring service that delivers powerful full stack analytics. Optimize and monitor your browser, app, & servers with just a few lines of code. Try New Relic and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_apr _______________________________________________ Darktable-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/darktable-users
