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Date: Fri, 25 Oct 2013 10:23:43 +0300
From: Vitalij Satanivskij <satan@ukr.net>
To: Andriy Gapon <avg@FreeBSD.org>
Subject: Re: FreeBSD 10.0-BETA1 #8 r256765M spend too  much time in locks
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http://quad.org.ua/profiling.tgz

results of both methods

but for pmcstat to few buffers configured by default so not all statistics in summary ^( 



Andriy Gapon wrote:
AG> 
AG> When that high load happens again could you please run some profiling tool that
AG> is capable of capturing the whole stacks of hot code paths?
AG> 
AG> I can suggest two alternatives:
AG> 
AG> 1. hwpmc
AG> pmcstat -S instructions -O sample.out
AG> pmcstat -R sample.out -G summary.out
AG> 
AG> 2. The following DTrace script:
AG> 
AG> profile:::profile-1113
AG> /!(curthread->td_flags & 0x20)/
AG> {
AG> 
AG>         @stacks[stack()] = count();
AG> }
AG> 
AG> END
AG> {
AG>         trunc(@stacks, 10);
AG>         printa(@stacks);
AG> }
AG> -- 
AG> Andriy Gapon
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