Date: Fri, 5 Apr 2002 14:18:38 -0800 (PST) From: Doug White <dwhite@resnet.uoregon.edu> To: Alessandro de Manzano <adm@unixmania.net> Cc: Alfred Perlstein <bright@mu.org>, <hackers@FreeBSD.ORG> Subject: Re: Is a debug kernel slower than a non-debug one ? Message-ID: <20020405141702.V36072-100000@resnet.uoregon.edu> In-Reply-To: <20020405220831.B14188@libero.sunshine.ale>
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On Fri, 5 Apr 2002, Alessandro de Manzano wrote: > On Fri, Apr 05, 2002 at 12:00:05PM -0800, Alfred Perlstein wrote: > > Wow, thanks for the super-fast answer! :)) > > > > > on my production servers' kernel so in the very rare case of crash I'll > > > got a crash dump ( I'ld use also options DDB_UNATTENDED) and could > > > immediately have a backtrace report. > > > > > > ..Am I crazy ? :-)) > > > > I don't think you'll notice a difference for most stuff, this is how > > does the "-g" option (GCC option I guess) disable the "-O" optimizing > option ? > If "-g" simply attach the symbols and similar debug info to the > executable I guess the kernel should not be slower, but I don't know > GCC very well... Note that the kernel binary with debugging symbols is left in /sys/compile/MYKERNEL/kernel.debug while the actual kernel is stripped before installation into /kernel. If the debugging kernel was actually loaded it would be gigantic :) This is all detailed in the Handbook section on kernel debugging, btw. Doug White | FreeBSD: The Power to Serve dwhite@resnet.uoregon.edu | www.FreeBSD.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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