Re: perf: counter and event question

[Peter Zijlstra]

On Mon, 2009-12-28 at 13:39 +0100, Tim Blechmann wrote:
> On 12/28/2009 12:26 PM, Peter Zijlstra wrote:
> > On Mon, 2009-12-28 at 12:16 +0100, Tim Blechmann wrote:
> >> like it is impossible to sample instructions with a period of 1? 
> > 
> > Pretty much, imagine the cpu getting a trap every cycle.
> 
> is this a hardware restriction? a slowdown is acceptable for me, as long
> as i am able to collect a huge number of samples accurately ...

Large number of samples and sample interval are only related through the
runtime of your application.

Use a sensible period (~10k ins) and run a 'little' longer.



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