Windows: opencl call failed

Traceback (most recent call last):
  File "C:/msys64/mingw64/lib/python2.7/site-packages/cx_Freeze/initscripts/Console.py", line 27, in <module>
  File "butterflow/__main__.py", line 12, in <module>
  File "butterflow/cli.py", line 262, in main
RuntimeError: opencl call failed

I do have the latest nVidia driver installed. I’m using Windows 10.

[excxp]

i think i found the problem: butterflow expects the pathname to 64bit opencl dll to be installed at: HKEY_LOCAL_MACHINE\SOFTWARE\Khronos\OpenCL\Vendors

and 32bit dll at: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Khronos\OpenCL\Vendors

For some reason recent nvidia driver installers do not setup the regkeys. if you want to get butterflow working with latest nvidia drivers, manually installing the regkeys worked for me:

do a search in your windows folder for nvopencl64.dll and nvopencl32.dll (it should be in driverstore, use the one from your latest nvidia driver). here’s an example of the regkeys to install :

[HKEY_LOCAL_MACHINE\SOFTWARE\Khronos\OpenCL\Vendors] “C:\Windows\System32\nvopencl64.dll”=dword:00000000

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Khronos\OpenCL\Vendors] “C:\Windows\System32\nvopencl32.dll”=dword:00000000

[irfanfadilah]

@excxp your solution is working fine. But in my case, the location of the dll files are located at:

C:\Windows\System32\DriverStore\FileRepository\nvmii.inf_amd64_995a8ca55addcada\nvopencl64.dll

and

C:\Windows\System32\DriverStore\FileRepository\nvmii.inf_amd64_995a8ca55addcada\nvopencl32.dll