Last time i've used it it was working but I dont think it is really useful now (from my POV) because you cant have a global view of the system with it and all other reports overlap. With the current state you have: - top mode for fast lookup - text output (replace gprof for me) - kcachegrind (calltree) for in depth analysis - gprof Fabien > On Fri, Jan 14, 2011 at 10:10 PM, Steve Kargl > <sgk_at_troutmask.apl.washington.edu> wrote: >> On Fri, Jan 14, 2011 at 03:40:46PM -0500, George Neville-Neil wrote: >>> >>> On Jan 13, 2011, at 23:05 , Steve Kargl wrote: >>> >>>> On Thu, Jan 13, 2011 at 10:08:30PM -0500, Ryan Stone wrote: >>>>> I would suggest using hwpmc for profiling: >>>>> >>>>> # kldload hwpmc >>>>> # pmcstat -S unhalted-cycles -O /tmp/samples.out ../penetration >>>>> # pmcstat -R /tmp/samples.out -G /tmp/penetration.txt >>>>> >>>>> >>>>> You can also get pmcstat to generate gprof-compatible output with -g, >>>>> but I never use the mode so I'm really not sure what it gives you. I >>>>> think that you have to run gprof on the output or something, but don't >>>>> hold me to that. >>>> >>>> >>>> Thanks. I'll give it a try, but my initial attempt seems to >>>> indicate that one needs to be root to use hwpmc. >>>> >>>> laptop:kargl[210] pmcstat -S unhalted-cycles -O /tmp/samples.out ../penetration >>>> pmcstat: ERROR: Cannot allocate system-mode pmc with specification >>>> "unhalted-cycles": Operation not permitted >>>> >>> >>> You only need to be root to profile the kernel or someone else's process. >>> >>> This tutorial might help: >>> >>> www.dcbsdcon.org/speakers/slides/neville-neil_dcbsdcon2009.pdf >>> >> >> Thanks. I'll look at the tutorial. Meanwhile, should gprof >> be removed from the base system because it appears broken? > > Instead of just removing things, why not determine why things are > broken and try to fix them? > -Garrett > _______________________________________________ > freebsd-current_at_freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe_at_freebsd.org"Received on Mon Jan 17 2011 - 08:01:13 UTC
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