What does a GPU kernel overhead consist of?

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I have a piece of code that launches thousands of kernels and I am making a run-time performance model that explains the runtime based on the problem and machine specs. What I need to know is, how can I relate the kernel overhead, to host and device performance specs(bandwidth, ...) , what parameters affect kernel overhead, and what is happening under the hood that causes the kernel overhead. I am using OpenCL

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