Posted by Arnold on Jan 29, 2017; 2:51pm
URL: https://forum.jogamp.org/Enigmatic-benchmark-results-tp4037603p4037617.html

Thanks WadeWalker for your explanation. I had the naive impression that the openCL library functions would be always faster. I now know better :-) Just for fun I have the benchmarks results below
Running benchmark for 3 devices.
Summary of computing vectors with 20,000,000 elements (time in ms)
Device                       VectorAdd.cl         VectorMul.cl         VectorDiv.cl         VectorTri.cl
GeForce GTX 1060 6GB          160                  157                  156                  182
Intel(R) Core(TM) i7              154                  159                  154                  336
Ellesmere                             125                  104                    89                  105
Plain Java                               41                    41                    80                2768


What I want to do is fractal computation and linear algebra, like matrix multiplications, for neural networks. I parallellised the Mandelbrot in a "classic" way using threads and that works. I found the openCL demo code and I got it running, but I don't understand it. That's why I am learning openCL in general now, somewhere down the road to understanding openCL i should start to understand the Mandelbrot code :-) (after having it stripped from all the GL stuf).

My understanding fails at the data types. The book I use to learn openCL (OpenCL Parallel Programming Development Cookbook from Raymond Tay) explains buffers the C way. I cannot "translate" a struct with four ints as user data to a CLBuffer<type> without having to implement it as an extended Buffer class. So I might use an IntBuffer but that requires indexing and will be hopeless for user data with mixed data types. Is there a simpler way to define ones own data structure in Java?

I wrote a device lister, that lists each device and its capabilities and this benchmark program, that runs a benchmark for each device. I can contribute these to the demo package. just let me know.