How to application sample profiling?

[Slawa Olhovchenkov]

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