Date: Wed, 26 Aug 2015 13:25:25 -0700 From: Stanislav Sedov <stas@freebsd.org> To: Slawa Olhovchenkov <slw@zxy.spb.ru> Cc: freebsd-hackers@FreeBSD.org Subject: Re: How to application sample profiling? Message-ID: <9BFE7A4D-CCA3-4B44-9E2D-F6F7DAB78F07@freebsd.org> In-Reply-To: <20150823221312.GD21849@zxy.spb.ru> References: <20150823221312.GD21849@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
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