"clRetainDevice" maybe NULL about compute HOT 5 CLOSED

The library will use functions based on the OpenCL version reported by the CL/cl.h header you compile against. In order to properly run against NVIDIA's OpenCL, you should set your header include paths to point to the CL/cl.h header provided by NVIDIA (mine is in /usr/include/nvidia-current/). Same goes for compiling against Intel's OpenCL (which is /opt/intel/opencl-1.2-3.0.56860/include/ for me).

Let me know if this doesn't work.

Cheers,
Kyle

from compute.

The capability of my computer reported by Intel OpenCL "capsbasic" is:

Number of available platforms: 2
Platform names:
[0] NVIDIA CUDA
[1] Intel(R) OpenCL [Selected]
Number of devices available for each type:
CL_DEVICE_TYPE_CPU: 1
CL_DEVICE_TYPE_GPU: 0
CL_DEVICE_TYPE_ACCELERATOR: 0

*** Detailed information for each device ***

CL_DEVICE_TYPE_CPU[0]
CL_DEVICE_NAME: Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz
CL_DEVICE_AVAILABLE: 1
CL_DEVICE_VENDOR: Intel(R) Corporation
CL_DEVICE_PROFILE: FULL_PROFILE
CL_DEVICE_VERSION: OpenCL 1.2 (Build 63463)
CL_DRIVER_VERSION: 1.2
CL_DEVICE_OPENCL_C_VERSION: OpenCL C 1.2

Number of available platforms: 2
Platform names:
[0] NVIDIA CUDA [Selected]
[1] Intel(R) OpenCL
Number of devices available for each type:
CL_DEVICE_TYPE_CPU: 0
CL_DEVICE_TYPE_GPU: 1
CL_DEVICE_TYPE_ACCELERATOR: 0

*** Detailed information for each device ***

CL_DEVICE_TYPE_GPU[0]
CL_DEVICE_NAME: GeForce 505
CL_DEVICE_AVAILABLE: 1
CL_DEVICE_VENDOR: NVIDIA Corporation
CL_DEVICE_PROFILE: FULL_PROFILE
CL_DEVICE_VERSION: OpenCL 1.0 CUDA
CL_DRIVER_VERSION: 286.10
CL_DEVICE_OPENCL_C_VERSION: OpenCL C 1.1

Therefore I have to write the code to get the second platform and pass it to compute::device . But I think a OpenCL library can find different version of different platform. It may be 1.0 or latest. So what's the way to solve it?

from compute.

Interesting. I'll have to thing more on how to support devices from two different platforms with two different OpenCL versions simultaneously. For now, can you try compiling against the OpenCL version 1.1 headers? That should serve as the "lowest common denominator" and allow you to use both devices.

from compute.

So I ran into this problem again. I think I have a fix here (54c2ab3). Could you try it out and let me know if it works for you?

from compute.

Fixed in 88b6a8b.

from compute.