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Subject: Re: How to application sample profiling?
From: Stanislav Sedov <stas@freebsd.org>
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Date: Wed, 26 Aug 2015 13:25:25 -0700
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To: Slawa Olhovchenkov <slw@zxy.spb.ru>
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> On Aug 23, 2015, at 3:13 PM, Slawa Olhovchenkov <slw@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.

Which FreeBSD version are you using by the way?

--
Stanislav Sedov
ST4096-RIPE