How to calculate Clock Cycles count for a function

sumitgulati — Mon, 24 Mar 2008 14:47:01 GMT

I want to calculate cycles count for a function using vtune analyser.

My main concern is how to calculate the Cycles count for the stall period ..

Thanks in Advance

sumit

Re: How to calculate Clock Cycles count for a function

David_A_Intel1 — Fri, 04 Apr 2008 21:22:45 GMT

The VTune analyzer does not measure the number of cycles that every instruction takes. That would cause your code to run at about 1/1000 the speed it normally runs! :-( Instead, it periodically notes where the processor is executing code and gives you a statistically accurate representation of where the processor is spending it's time. This means your code runs at almost full speed (we say <5% overhead for sampling).

On the Intel Core2 processor family, using the VTune analyzer, you can roughly calculate stalls due to cache misses. See this paper for more info.

topic How to calculate Clock Cycles count for a function in Analyzers

How to calculate Clock Cycles count for a function

Re: How to calculate Clock Cycles count for a function