How to application sample profiling?
Slawa Olhovchenkov
slw at zxy.spb.ru
Wed Aug 26 20:41:28 UTC 2015
On Wed, Aug 26, 2015 at 01:25:25PM -0700, Stanislav Sedov wrote:
>
> > On Aug 23, 2015, at 3:13 PM, Slawa Olhovchenkov <slw at zxy.spb.ru> wrote:
> >
> > I have multi-thread application fully utilise all CPU cores.
> > I am need to determine lines give mostly CPU loads.
> > How I can do this?
> >
> > `pmcstat -P BU_CPU_CLK_UNHALTED -t application_pid -n 500000 -O sample.out`
> > consume to many CPU (performance drop x100 times) and mostly show
> > himself in kernel and pmc locks and none for application.
> > pmcstat -S BU_CPU_CLK_UNHALTED -- same here.
> >
>
> Did you try something like `pmcstat -S instructions -T` by any chance?
> That should give some quick clues as to which functions are being hot
> at least.
I am try '-S instructions' w/o -T, no difference.
> Which FreeBSD version are you using by the way?
10-STABLE
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