Isolating high cpu load at function level
mel.flynn+fbsd.questions at mailing.thruhere.net
Thu Jun 25 06:24:54 UTC 2009
On Wednesday 24 June 2009 07:42:06 Gary Gatten wrote:
> I have a process with several threads - the main "worker" threads
> typically use < 20% CPU - but after upgrading to a new version they're
> now using > 90% cpu. I'm trying to determine what function these
> threads are performing that's requiring so much more cpu. Is it bad
> code? I bug in a library I linked against? What?
> I've tried gdb with list, info threads, info stack, bt full. I can make
> sense of some of it. I guess what I'm hoping for is something like
> "top" at the thread level, such that functions that thread perform are
> sorted highest util (time/whatever).
You'd typically turn on profiling, but sometimes less information is good, so
you might be able to get the info you need by having your workers report the
libwp has some support for reporting that you could extend with values
you're interested in.
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