Device and compute backend selection for benchmarks about viennaclbench-dev

[namikk]

Platform/device switching implemented. Closing.

[karlrupp]

Just a question: Is it possible to select the OpenMP backend?

[namikk]

I don't recall implementing anything related to OpenMP. So unless ViennaCL handles that in the background and provides access to it through viennacl::ocl::get_platforms(), it's not available for selection.

[karlrupp]

As the name suggests, everything below viennacl::ocl:: is for OpenCL. In order to run things using the host-based backend, one needs to pass the MAIN_MEMORY qualifier to the constructor of the ViennaCL objects, whereas OPENCL_MEMORY is implicitly taken as default if the OpenCL backend is enabled.