From: Paul de Vrieze <pauldv@gentoo.org>
To: gentoo-dev@gentoo.org
Subject: Re: [gentoo-dev] "Distro Day (Measuring the benefits of the Gentoo approach)"
Date: Thu, 14 Aug 2003 12:10:57 +0200 [thread overview]
Message-ID: <200308141210.57530.pauldv@gentoo.org> (raw)
In-Reply-To: <1060814942.27241.148.camel@rattus.Localdomain>
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> We may be getting a P4 hyperthreaded system to play with, but under
> different rules, where I get to do a bit of tuning first. I have
> already built the core system on another machine using gcc-3.2.3,
> "-march=pentium4 -O3 -pipe -fomit-frame-pointer" I note that the
> pentium4 warning still appears in make.conf, though I believe it no
> longer applies to this gcc.
>
> A while ago I emailed this list and asked for information on tests and
> settings for HT P4's, without a reply. So again, has anyone done any
> tests on a HT P4 and is willing to support the flags they chose as being
> "the best"? In particular, does -ffast-math give a measurable gain?
> Most of my machines have been built as scientific stations, so accuracy
> is more important than ultimate speed, so this is one I have never
> tested. I am not interested in the -O9 -max-everything kiddies who have
> been so vocal, but reasoned choices.
>
> If you want to flame, go ahead - but support your statements!
Well all packages that cannot handle -march=pentium4 should filter it out.
This filtering is imprefect so adding -mcpu=pentium4 should ensure correct
scheduling of all packages. One thing, do not use -ffast-math, as can be seen
in the manual this can actually produce mathematic errors. Normally one does
not want this in most packages, so leave it alone. It could be used in things
like games, wher the precision does not matter that much, but it is not safe
as a default.
Paul
--
Paul de Vrieze
Gentoo Developer
Mail: pauldv@gentoo.org
Homepage: http://www.devrieze.net
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next prev parent reply other threads:[~2003-08-14 10:10 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-13 13:38 [gentoo-dev] "Distro Day (Measuring the benefits of the Gentoo approach)" Philippe Lafoucrière
2003-08-13 14:07 ` brett holcomb
2003-08-13 15:03 ` Sven Vermeulen
2003-08-13 16:15 ` Alan
2003-08-13 20:30 ` Chris Gianelloni
2003-08-13 14:08 ` Chris Gianelloni
2003-08-13 14:12 ` Brad Laue
2003-08-13 14:20 ` Philippe Lafoucrière
2003-08-13 14:25 ` Philippe Lafoucrière
2003-08-13 14:32 ` Chris Gianelloni
2003-08-13 16:17 ` Alan
2003-08-13 16:22 ` Patrick Kursawe
2003-08-13 20:35 ` Chris Gianelloni
2003-08-13 20:32 ` Chris Gianelloni
2003-08-14 10:02 ` Paul de Vrieze
2003-08-13 21:15 ` FRLinux
2003-08-13 22:49 ` William Kenworthy
2003-08-14 2:04 ` Brian Jackson
2003-08-14 10:10 ` Paul de Vrieze [this message]
2003-08-14 12:30 ` Chris Gianelloni
2003-08-14 16:59 ` William Kenworthy
2003-08-14 17:38 ` [gentoo-dev] "Distro Day (Measuring the benefits of the Gentooapproach)" matt c
2003-08-14 19:22 ` [gentoo-dev] "Distro Day (Measuring the benefits of the Gentoo approach)" FRLinux
2003-08-14 23:01 ` William Kenworthy
2003-08-13 14:24 ` David Holm
2003-08-13 14:28 ` Philippe Lafoucrière
2003-08-13 16:16 ` Eric Olinger
2003-08-13 19:00 ` Jon Portnoy
2003-08-13 20:02 ` Mike Frysinger
2003-08-14 1:07 ` [gentoo-dev] 'Distro Day (Measuring the benefits of the Gentoo approach)' donnie berkholz
2003-08-14 1:13 ` Jon Portnoy
2003-08-14 11:01 ` Chris Gianelloni
2003-08-13 14:34 ` [gentoo-dev] "Distro Day (Measuring the benefits of the Gentoo approach)" Stuart Herbert
2003-08-13 14:34 ` Svyatogor
2003-08-13 17:46 ` Adam Porich
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