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Altera_Forum's avatar
Altera_Forum
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8 years ago

Different Kernel Executions times

Hi! I'm getting a strange thing when executing a kernel multiples times (inside a loop). The first execution always take a long time compared to the others.. Example: Number of calls: 10...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

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Try moving clSetKernelArg and checkError outside of the timing region and only time clEnqueueTask and clFinish.

You can also use OpenCL's built-in profiler that allows you to accurately measure kernel execution time, and see if you would still see any variance in the run time.

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Do you have any profiling tool to MS VS2012? or any reliable function to measure the executions times, i said this because im not confident about the function i encounter to measure the times.