Date: Wed, 5 Aug 2009 12:19:23 +0200 From: Roland Smith <rsmith@xs4all.nl> To: David Southwell <david@vizion2000.net> Cc: freebsd-questions@freebsd.org Subject: Re: Learning about Control of Optimization -- for dummies please Message-ID: <20090805101923.GA26096@slackbox.xs4all.nl> In-Reply-To: <200908051054.07456.david@vizion2000.net> References: <200908051054.07456.david@vizion2000.net>
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[-- Attachment #1 --] On Wed, Aug 05, 2009 at 10:54:07AM +0100, David Southwell wrote: > I have found http://docs.freebsd.org/info/gcc/gcc.info.Optimize_Options.html. > > I am about to build a new kernel am starting to dig a bit deeper into things I > have, until now, taken for granted. > > The above link is very informative in technical terms about how to control > optimization but I find it difficult to interpret the info in a way that tells > me what might work best on my own system (Intel quad Core) with 8G of ram. The build system takes care of that, once you have set the correct CPUTYPE in /etc/make.conf. For a quad-core, set CPUTYPE=nocona. See make.conf(5), /usr/src/share/mk/bsd.cpu.mk and /usr/src/sys/conf/kern.pre.mk. Additionally, compiler settings for building the kernel can be set with COPTFLAGS in /etc/make.conf. Using anything other than -O or -O2 is not guaranteed to work. If you don't know what you are doing, do not use COPTFLAGS and stick with the defaults that the build system generates. Roland -- R.F.Smith http://www.xs4all.nl/~rsmith/ [plain text _non-HTML_ PGP/GnuPG encrypted/signed email much appreciated] pgp: 1A2B 477F 9970 BA3C 2914 B7CE 1277 EFB0 C321 A725 (KeyID: C321A725) [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.12 (FreeBSD) iEYEARECAAYFAkp5XKsACgkQEnfvsMMhpyVg1QCfdMQTSPfjmiuqoFSzl+dEWF/e Z5sAn3qSyDwV7og7sX7LZq6zwZwP7cLs =bv04 -----END PGP SIGNATURE-----
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