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Difference between CL_DEVICE_MAX_WORK_GROUP_SIZE and CL_KERNEL_WORK_GROUP_SIZE
Procoller
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Join Date: 15 Jun 15
Posts: 5
Posted: Thu, 2015-07-23 01:12
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Hello All,
               I am new to this OpenCL parallel processing. I want to do parallel processing of image processing algorithm which is running in CPU. 
So I am confused between two terms,
 
(1) CL_DEVICE_MAX_WORK_GROUP_SIZE in clGetDeviceInfo which gives me 256
(2) CL_KERNEL_WORK_GROUP_SIZE in clGetKernelWorkGroupInfo which gives me 128
 
I have launch kernel with localWorkgroup = {16,16} and globalWorkGroup = {width,height}.
But it gives me an error of 'CL_INVALID_WORK_GROUP_SIZE'. 
 
After that i launched kernel with localWorkgroup = {11,11} and globalWorkGroup = {width,height} which worked for me. 
So is it taking 2nd one CL_KERNEL_WORK_GROUP_SIZE to launch kernel.
After that i tried to change local_work_group_size from {12,12},{13,13,},{14,14,},{15,15,} but it gives me same error.
 
Your help much appreciated...
Thanks in advance...
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