Am Mittwoch, 14. September 2016, 18:56:03 CEST schrieb Ulrich Pegelow:


> There is a quick fix for that in darktable. You can switch config
> variable opencl_use_pinned_memory to TRUE (can be found in darktablerc).
> At least here on my this makes a difference of up to a factor of 30
> (oldish GeForce GTS 450 and 367.35 driver).


> If my findings are confirmed we will change the default setting of that
> flag for new installations. Users of existing installations will need to
> change the config flag manually.

With a speed difference like that, couldn't we run a small benchmark at init 
time (we already compare the speed to the CPU) and set the flag accordingly at 

> Please check and report back.
> Ulrich



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