On Mon, 2 Jul 2007, Girish Motwani wrote:
Does the kernel profiling tool kgmon give accurate information on
multiprocessor systems ? Or is there some other tool for SMP systems ? I
tried looking up the archives for information on this, but could not find
any.
Girish--
Take a look at hwpmc(4), pmccontrol(8), and pmcstat(8). These allow you to do
kernel-only or systemic samplic using performance monitoring counters,
including looking at CPU time, cache misses, instructions retired, etc. I
posted a sixty second howto here:
http://lists.freebsd.org/pipermail/freebsd-current/2006-February/061096.html
Among other things, you can generate gprof output from PMC; right now, that's
without full stack traces (and hence callgraphs), but Joseph Koshy has work in
P4 implementing stack trace support. I imagine this will go in after the 7.0
freeze lets up.
Robert N M Watson
Computer Laboratory
University of Cambridge
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