Hey, > This sounds very much like what I need right now. :)
Hmm, too bad we don't have it yet... > About running OpenCL on the CPU: I'm not really experienced with > OpenCL yet. Do I need some additional extra flags so that it uses the > CPU? What performance could I expect? Esp., can I expect better > performance than the straightforward single-thread implementation of > matrix-matrix multiplication? We managed to get pretty close to the performance of Intel's MKL, but this also depends on the OpenCL SDK in use. > I just tried VIENNACL_WITH_OPENCL and I get the exception > invalid_buffer_size as written in my other mail. So I guess my matrix > is too big for OpenCL? If OpenCL is using the CPU, how can that be? > (Because without OpenCL, the code works fine.) By default it is using the GPU. You can select the CPU via viennacl::ocl::set_context_device_type(0, viennacl::ocl::cpu_tag()); (see here for explicitly selecting GPUs: https://github.com/viennacl/viennacl-dev/blob/master/examples/benchmarks/blas3.cpp#L83 as well as chapter "Configuring OpenCL Contexts and Devices" in the manual) The viennacl-info example (make vienncl-info && examples/tutorial/viennacl-info) prints all available devices to screen if you're unsure about your OpenCL devices. Best regards, Karli ------------------------------------------------------------------------------ Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk _______________________________________________ ViennaCL-devel mailing list ViennaCL-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/viennacl-devel
