On 20/01/16 07:42, Ulrich Pegelow wrote:
1) with OpenCL enabled in preferences
2) with OpenCL disabled in preferences
a) exporting an X-Trans image with default history stack
b) as above but now with demosaic set to Markesteijn-3

It appears that exports are about twice as fast with OpenCL enabled on my system:

OpenCL markesteijn-1: 0.281 secs
OpenCL markesteijn-3: 0.492 secs
CPU    markesteijn-1: 0.544 secs
CPU    markesteijn-3: 1.273 secs

Don't forget to tell me your hardware setup (Graphics Card, GPU memory,
CPU type, system memory).

Graphics card is an AMD R9 280 with 3GB RAM:

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Tahiti PRO [Radeon HD 7950/8950 OEM / R9 280]

CPU is: Intel(R) Core(TM) i5-4690 CPU @ 3.50GHz

System RAM is: Corsair Vengeance LP 16GB (2 x 8GB) 240-Pin DDR3 SDRAM 1600 (PC3 12800)

measurement. Does darktable react more "snappy" with OpenCL or just the
opposite?

Definitely significantly snappier. The lag between moving the image and it turning from blurry to sharp is really noticeable with the CPU codepath but almost gone with opencl.

Regards,

Rob
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