Date: Sun, 12 Jan 1997 09:24:20 -0800 From: David Greenman <dg@root.com> To: Andrew <andrew@ugh.net.au> Cc: questions@freebsd.org Subject: Re: Compiling kernel with optimisation Message-ID: <199701121724.JAA25580@root.com> In-Reply-To: Your message of "Mon, 13 Jan 1997 03:32:44 %2B1100." <Pine.BSF.3.95.970113032400.1179D-100000@mopsy.hobart.tased.edu.au>
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>I just noticed that when compiling a kernel it is done with the -O flag. >Would there be much speed improvement in the sytem if it was done with >-O3? Would this break the kernel or is the added time it takes to compile >not worth the benfits? It has very little effect on performance and optimizations levels > "-O" have traditionally been broken in gcc. >I'd try myself but it takes me 4.5 hours just to do the kernel with -O :-( Then you need to add some memory, then. It shouldn't be anywhere near that slow. -DG David Greenman Core-team/Principal Architect, The FreeBSD Project
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