darktable -d opencl
0.075370 [opencl_init] opencl related configuration options:
0.075378 [opencl_init]
0.075379 [opencl_init] opencl: 1
0.075381 [opencl_init] opencl_scheduling_profile: ‘default’
0.075382 [opencl_init] opencl_library: ‘’
0.075383 [opencl_init] opencl_memory_requirement: 768
0.075385 [opencl_init] opencl_memory_headroom: 400
0.075386 [opencl_init] opencl_device_priority: ‘/!0,///!0,*’
0.075387 [opencl_init] opencl_mandatory_timeout: 200
0.075388 [opencl_init] opencl_size_roundup: 16
0.075389 [opencl_init] opencl_async_pixelpipe: 0
0.075390 [opencl_init] opencl_synch_cache: active module
0.075391 [opencl_init] opencl_number_event_handles: 25
0.075393 [opencl_init] opencl_micro_nap: 1000
0.075394 [opencl_init] opencl_use_pinned_memory: 0
0.075395 [opencl_init] opencl_use_cpu_devices: 0
0.075396 [opencl_init] opencl_avoid_atomics: 0
0.075396 [opencl_init]
0.075461 [opencl_init] could not find opencl runtime library ‘libOpenCL’
0.075479 [opencl_init] could not find opencl runtime library ‘libOpenCL.so’
0.075532 [opencl_init] found opencl runtime library ‘libOpenCL.so.1’
0.075545 [opencl_init] opencl library ‘libOpenCL.so.1’ found on your system and loaded
0.097885 [opencl_init] could not get platforms: -1001
0.097893 [opencl_init] FINALLY: opencl is NOT AVAILABLE on this system.
0.097895 [opencl_init] initial status of opencl enabled flag is OFF.
And, these libraries exist on my system:
find /usr -name OpenCL
/usr/lib64/nvidia/libOpenCL.so.1
/usr/lib64/nvidia/libOpenCL.so.1.0.0
/usr/lib64/libOpenCL.so.1
/usr/lib/libOpenCL.so
/usr/lib/libOpenCL.so.1
/usr/lib/libOpenCL.so.1.0.0