Take a look at SimpleMultiDevice sample where all combinations explained.
Thank you for your answer,
I'm not familar with the sdk-environment, but if i am right, i have to create some threads with an multithreading framework. like openmp?
I will try to use sdk-environment instead of khronos opencl binding.
I tried with openmp, works wonderfull (if i don't need any synchronization).
is there a multithreading extension in opencl for the host?