Re: IPC sampling

[Jose <jose.sgarcia.aldonza@gmail.com>]

Andi Kleen <andi <at> firstfloor.org> writes:

> 
> Jose <jose.sgarcia.aldonza <at> gmail.com> writes:
> >
> > My problem now is that I don't know how to obtain "cycles" and
> > "instructions" from perf.data file. I have tried several options using "perf
> > report" and "perf script" but I don't achieve it.
> 
> perf record -e '{instructions,cycles}:S' ...
> perf script
> 
> This means sample on cycles, but always read instructions too during the
sample.
> Then match up the values with the same time stamp from perf script and
> calculate ipc, or use a perf script interpreted script to do so.
> 
> -Andi
> 


Good! 

Two additional questions:

- If using '{cycles,instructions}:S', is sampling on instructions? Sometimes
I'm interested to sample on number of instructions.

I don't find information about option :S from man pages. Is there a manual
with much more information?

- Could you provide more information (links, an example, ...) on "perf
script interpreted script"

Thanks
Jose