Calculate GFLOPs


In Intel Vtune Amplifier profiler, there is no counter for how many instructions execute on Integrated GPUs.

Instead, the profiler provide three metrics indicating the ratio of EU in state active, stall and idle.

So if my kernel (written in OpenCL) is highly divergent and the divergence is input dependent, it is difficult to measure  the GFLOPS,

any ideas?

Achieving peak bandwidth on multi-socket systems

Let's say each CPU socket has 43 GB/s of bandwidth through its four memory channels.  Let's say I have a dual socket system.  A reduction operation should achieve performance of 86 GB/s, but it doesn't.  It will still only achieve up to 43 GB/s.  Why is that and is there anything in Intel's OpenCL implementation for CPUs that can fix that?

How could I fix that outside of OpenCL?

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