OpenCL and Darktable 3.8

Hardware
1

Not sure whether this is a 3.8 issue, or whether it occurred with an earlier, 3.7 version. I noticed that processing was slower than I expected and on investigation that openCL wasn’t being used. Running darktable-cltest gives:

0.020659 [opencl_init] opencl related configuration options:
0.020667 [opencl_init] 
0.020669 [opencl_init] opencl: 1
0.020671 [opencl_init] opencl_scheduling_profile: 'very fast GPU'
0.020674 [opencl_init] opencl_library: ''
0.020676 [opencl_init] opencl_memory_requirement: 768
0.020679 [opencl_init] opencl_memory_headroom: 400
0.020682 [opencl_init] opencl_device_priority: '*/!0,*/*/*'
0.020686 [opencl_init] opencl_mandatory_timeout: 200
0.020689 [opencl_init] opencl_size_roundup: 16
0.020709 [opencl_init] opencl_async_pixelpipe: 0
0.020712 [opencl_init] opencl_synch_cache: active module
0.020714 [opencl_init] opencl_number_event_handles: 25
0.020717 [opencl_init] opencl_micro_nap: 1000
0.020720 [opencl_init] opencl_use_pinned_memory: 0
0.020722 [opencl_init] opencl_use_cpu_devices: 0
0.020724 [opencl_init] opencl_avoid_atomics: 0
0.020739 [opencl_init] 
0.020811 [opencl_init] could not find opencl runtime library 'libOpenCL'
0.020840 [opencl_init] could not find opencl runtime library 'libOpenCL.so'
0.021027 [opencl_init] found opencl runtime library 'libOpenCL.so.1'
0.021041 [opencl_init] opencl library 'libOpenCL.so.1' found on your system and loaded
0.048800 [opencl_init] could not get platforms: -1001
0.048810 [opencl_init] FINALLY: opencl is NOT AVAILABLE on this system.
0.048812 [opencl_init] initial status of opencl enabled flag is OFF.

I am running on openSuse with an NVidia GEforce GTX 1070. Any ideas as to why openCL is disabled.

2

Is the box checked in your preferences?

3

Looks more like the nvidia kernel module is not loaded.

4

If I do an lsmod I get

nvidia_drm 69632 6
nvidia_modeset 1204224 17 nvidia_drm
nvidia_uvm 2531328 0
nvidia 35373056 1055 nvidia_uvm,nvidia_modeset
drm_kms_helper 319488 1 nvidia_drm
drm 634880 10 drm_kms_helper,nvidia,nvidia_drm

It looks as though the NVidia module is loaded

5

Try checking if the files and symlinks described in
https://docs.darktable.org/usermanual/3.8/en/special-topics/opencl/setting-up/
are all present and correct.

6

And my own summary of the same, that contains an additional hint that may or may not be relevant:

1 Like
7

I have tried to match your details for Ubuntu with my OpenSuse system. As far as I can see, my system meets the requirements in terms of having the nVidia kernel module loaded, the nVidia openCL library installed etc.

I am not sure whether the problem is with the driver or the kernel (Tumbleweed ships with a 5.15 kernel), so I have taken the problem to the SuSe forums.