On 08.01.20 15:08, J. Paul Bissonnette wrote:
On Wed, 8 Jan 2020 14:48:18 +0100
"Anna Simon" <simona...@gmx.net> wrote:
Hi,
I have a laptop with dual graphics, Intel + Nvidia. Under Ubuntu, I
think darktable can use both GPUs since I installed the Intel Neo
driver. I have 2 questions/problems:
Is there any advantage in using both GPUs? If yes, what are the
optimal settings for them? I have read the chapter OpenCL and
multiple GPUs in the manual but it's difficult to understand for me.
Though I started darktable a few times with darktable -d perf, I am
not sure if it is faster than with CPU + Nvidia only, I have not done
extensive performance tests yet. I am not sure I can interpret the
output correctly. Panning at 100% view seems to take 1.75 seconds
with both GPUs and 1.85 with Nvidia only, with certain settings (new
denoise profiled nonlocal auto was active among other modules). These
are extracts from the output when I type darktable-cltest: 0.191446
[opencl_priorities] these are your device priorities: 0.191448
[opencl_priorities] image preview export thumbs
preview2 0.191450 [opencl_priorities] 0 0
0 0 0 0.191453 [opencl_priorities] 1
1 1 1 1 0.191456 [opencl_priorities] show if opencl
use is mandatory for a given pixelpipe: 0.191457
[opencl_priorities] image preview export thumbs
preview2 0.191462 [opencl_priorities] 0 0
0 0 0 0.191088 [opencl_init] OpenCL successfully
initialized. 0.191090 [opencl_init] here are the internal numbers and
names of OpenCL devices available to darktable: 0.191092
[opencl_init] 0 'GeForce MX250' 0.191097
[opencl_init] 1 'Intel(R) Gen11 HD Graphics NEO'
0.191103 [opencl_init] FINALLY: opencl is AVAILABLE on this system.
0.191106 [opencl_init] initial status of opencl enabled flag is ON.
Second question/problem: darktable can use both GPUs under Ubuntu but
not under Debian (testing or stable). Apparently, there the Nvidia
can only be used by darktable or other apps if Bumblebee is
installed. If Bumblebee is not installed, the device is not seen by
darktable. But if I type optirun darktable-cltest, only the Nvidia
can be used, the Intel device is not seen. Although driver 430 and
nvidia-settings from the nonfree repo is installed, nvidia-settings
cannot be started. The output is that the driver is not loaded, I
think. I have also removed the nouveau driver. Thanks in advance for
the help Anna
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In the Darktable preferences - core options are: default , multiple
GPUs and Very Fast GPU. Is that any help?
"multiple GPUs" is automatically chosen there
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