Hi,
JK -- Yes, they are not compatible but still they shouldn't contradict each
other.
I realized I am missing the "-u" flag later on. I mistakenly thought "-k"
means kernel + user mode. What still puzzles me is that although I was
sampling in kernel mode only, I still got samples in the user-code. That's
what made me make my wrong assumption. Any idea why ?
[...]
6 0.39% 86.79% 0xffffffff802be670 generic_permission<kernel>
6 0.39% 87.18% 0xffffffff802965d0 __inc_zone_state<kernel>
>>> 6 0.39% 87.57% 0x000000000048fee0
PyEval_EvalFrameEx</usr/local/bin/python>
On Mon, Apr 20, 2009 at 12:54 AM, stephane eranian
<eran...@googlemail.com>wrote:
> Nagy,
>
> On Sun, Apr 19, 2009 at 9:05 AM, Nagy Mostafa <nagy.most...@gmail.com>
> wrote:
> > Hi,
> >
> > I have a question about something strange I have noticed while collecting
> > profiles using pfmon. When I run a single cold run of the 2to3 benchmark,
> > the "time" command (or using --show-time) gives me:
> > $time /usr/local/bin/python -E -O
> benchmarks/unladen-swallow/lib/2to3/2to3
> > -f all benchmarks/unladen-swallow/lib/2to3 > /dev/null
> >
> > real 0m19.523s user 0m19.485s sys 0m0.044s
> >
>
> If you want comparable results, you simply need to count and breakdown
> kernel vs. user. Here how you can do this (assuming Core 2):
>
> pfmon
> -eunhalted_core_cycles,cpu_clk_unhalted:core_p,cpu_clk_unhalted_core_p
> --priv-levels=uk,u,k 2to3
>
> You will get 3 counts out. The first counts user+kernel cycles, the
> 2nd only user, 3rd only kernel.
>
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