Date: Sat, 1 Dec 2007 11:22:37 -0800 From: Garrett Cooper <youshi10@u.washington.edu> To: Nikos Ntarmos <ntarmos@ceid.upatras.gr> Cc: current@freebsd.org Subject: Re: gprof's broken in 7-CURRENT Message-ID: <A4F76BFD-E5BB-462A-ABA1-BE79FDC88469@u.washington.edu> In-Reply-To: <20071201191324.GA90389@ace.netcins.ceid.upatras.gr> References: <C2D2A8C6-8B39-4359-B968-0B52786B12EB@u.washington.edu> <20071201165946.GA13320@ace.netcins.ceid.upatras.gr> <20071201191324.GA90389@ace.netcins.ceid.upatras.gr>
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On Dec 1, 2007, at 11:13 AM, Nikos Ntarmos wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On Sat, Dec 01, 2007 at 06:59:46PM +0200, Nikos Ntarmos wrote: >> I just finished a cvsup/buildworld/installworld cycle and tried >> executing a CFLAGS+=-pg compiled version of pkg_info. Except from the >> (initially confusing) fact that pkg_info chdir(2)'s into every port's >> directory under /var/db/pkg and thus pkg_info.gmon is created in the >> dir of the last visited port, gprof didn't segfault or whatever. >> >> However, I now see an artifact, not present previously in my BETA1 >> world: .mcount seems to be taking the best part of the time >> percentage >> in the flat profile section. FYI I've done a 'pkg_info -a >/dev/null' >> and put the output of 'gprof /path/to/profiled/pkg_info >> pkg_info.gmon' >> online at http://ntarmos.dyndns.org/Misc/pkg_info.gprof. I also see >> this with my other -pg compiled code, so this is due to either >> something that changed between BETA1 and now, or some of the (just >> rebuilt) libraries taking up the change in profile.h. > > Interestingly, the .mcount flatprofline is substituted by _mcleanup if > pkg_info is compiled -O1 -- see [1]. If it is then compiled -O0, the > output is as in [2] (i.e. no .mcount and no _mcleanup). I guess > there's > something I don't get wrt optimization levels and profiling, > although I > can't quite see the connection. After all, .mcount and _mcleanup are > explicitly excluded by default (usr.bin/gprof/elf.c:59, > usr.bin/gprof/aout.c:61). > > \n\n > > [1] http://ntarmos.dyndns.org/Misc/pkg_info.gprof.O1 > [2] http://ntarmos.dyndns.org/Misc/pkg_info.gprof.O0 > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v2.0.4 (FreeBSD) > Comment: Nikos Ntarmos <ntarmos@ceid.upatras.gr> > > iD8DBQFHUbJUm6J1ac+VFgoRAmD8AJ9Ut3XoJVJwZ22OsArviKHjH4dsGwCeN4T4 > ECtTFTRuhQI/GVlny+VifyU= > =NSTP > -----END PGP SIGNATURE----- Strange. Maybe there are some inconsistencies between my system and an up-to-date system, or maybe I'm just using gprof incorrectly. Could you show me how you ran pkg_info with gprof please? Thanks, -Garrett
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