> The GPU is an Intel HD Graphics 4000.
>
> What worries me is not only the warmup, but the copy phase. In release it can
> take a lot of time for a simple 1M items (169 seconds!). I suspect I should
> try to do everything on the GPU. Not only that, but this call:
>
> viennacl::vector<float> gpuv;
> gpuv.resize(size);
>
> is taking 6 times what it takes on the CPU.
>
> How can I avoid these overheads? I am quite new with OpenCL...
>
> Thank you!
>
Sorry, I forgot the log for the twice-computed norm:
Computing norm_1 on GPU
Computing norm_1 on GPU 347
Computing norm_1 on GPU (again)
Computing norm_1 on GPU 2
Computing norm_1 on CPU
Computing norm_1 on CPU 0
As you can see, yes, the OpenCL compilation takes a lot of time, but still
higher than the CPU (with cache and all, I know).
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