Function getMemoryBusWidth

src/backend/opencl/platform.hpp:88–90

size_t getHostMemorySize();

inline unsigned getMemoryBusWidth(const cl::Device& device) {
    return device.getInfo<CL_DEVICE_GLOBAL_MEM_CACHELINE_SIZE>();
}

// OCL only reports on L1 cache, so we have to estimate the L2 Cache
// size. From studying many GPU cards, it is noticed that their is a