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Altera_Forum
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11 years ago

Kernel Launch Overhead

Hi everyone, I am currently trying to measure and minimize the kernel launch overhead, because the kernels that I wrote have to be launched repeatedly. I am wondering which of the fo...
Altera_Forum's avatar
Altera_Forum
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11 years ago

I think it's more correct in your second step to measure CL_PROFILING_COMMAND_START - CL_PROFILING_COMMAND_SUBMIT. Unless you immediately call clFlush on the command queue after an enqueue, the state transition from queued to submit may be postponed until deemed necessary by the runtime.

I think you'll find that the overhead is minuscule if the kernels are in the same aocx file. I prefer measuring all these times with one or more cl_event's and their queued, submit, start, end states.