Isn't POCL an ICD implementation also?
2013/6/4 Clay Chang <[email protected]>
> Hi Yue,
>
> POCL is an OpenCL implementation for CPU. It cannot detect GPU for sure.
> The question is why you expect CL_DEVICE_TYPE_GPU to work with POCL?
>
> But if you really want POCL to work with CL_DEVICE_TYPE_GPU, try modifying
> line 44 in lib/CL/devices/pthread/pocl-pthread.h:
>
> change
>
> CL_DEVICE_TYPE_CPU | CL_DEVICE_TYPE_DEFAULT,
>
> to
>
> CL_DEVICE_TYPE_CPU | CL_DEVICE_TYPE_DEFAULT | CL_DEVICE_TYPE_GPU,
>
> This should work for your purpose.
>
> Regards,
> Clay
>
>
> On Tue, Jun 4, 2013 at 10:20 PM, Yue Hu <[email protected]> wrote:
>
>> Hi all,
>>
>> I am new to pocl. When using pocl as an opencl implementation, I find
>> that my program cannot detect GPU device.
>>
>> The test program I use is "hotspot" from "rodinia_2.0.1". I am using pocl
>> 0.7.
>>
>> 1. When using default opencl implementation, the program can correctly
>> run and output.
>> Platform: NVIDIA Corporation
>> Device: GeForce GTX 580
>>
>> 2. To use pocl (Linking your program with pocl through an icd loader), in
>> its makefile file I replace
>> "$(CC) $(CC_FLAGS) -o $(EXE) -I$(OPENCL_INC) OpenCL_helper_library.c
>> hotspot.c -L$(OPENCL_LIB) -lOpenCL" with
>> "$(CC) $(CC_FLAGS) -o $(EXE) -I$(OPENCL_INC) OpenCL_helper_library.c
>> hotspot.c `pkg-config --libs --cflags pocl`"
>>
>> 3. Then I compile and run the program, it outputs
>> Platform: The POCL project
>> Error at line 179: CL_DEVICE_NOT_FOUND
>> The error happens in the line listed below:
>> context = clCreateContextFromType(context_properties, CL_DEVICE_TYPE_GPU,
>> NULL, NULL, &error);
>>
>> 4. I guess it is because pocl cannot detect GPU device, then I replace
>> "CL_DEVICE_TYPE_GPU" with "CL_DEVICE_TYPE_CPU" or "CL_DEVICE_TYPE_ALL". The
>> program can correctly run and outputs:
>> Platform0: The POCL project
>> Device: pthread
>>
>> Can anyone please comment on this?
>>
>> Thanks.
>>
>>
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>
>
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