lkml.org 
[lkml]   [2009]   [Dec]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: perf: counter and event question
From
Date
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.





\
 
 \ /
  Last update: 2009-12-28 14:07    [from the cache]
©2003-2011 Jasper Spaans