Date: Wed, 24 Jun 2009 22:24:51 -0800 From: Mel Flynn <mel.flynn+fbsd.questions@mailing.thruhere.net> To: freebsd-questions@freebsd.org Cc: Gary Gatten <Ggatten@waddell.com> Subject: Re: Isolating high cpu load at function level Message-ID: <200906242224.51785.mel.flynn%2Bfbsd.questions@mailing.thruhere.net> In-Reply-To: <70C0964126D66F458E688618E1CD008A0793F0AC@WADPEXV0.waddell.com> References: <70C0964126D66F458E688618E1CD008A0793F0AC@WADPEXV0.waddell.com>
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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 information. libwp[1] has some support for reporting that you could extend with values you're interested in. [1] http://www.garypennington.net/libwp/docs/html/ -- Mel
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