FreeBSD 10.0-BETA1 #8 r256765M spend too much time in locks
Vitalij Satanivskij
satan at ukr.net
Fri Oct 25 07:23:46 UTC 2013
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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