Date: Wed, 25 Feb 2004 11:35:50 -0800 From: "David O'Brien" <obrien@freebsd.org> To: Oliver Lehmann <lehmann@ans-netz.de> Cc: freebsd-alpha@freebsd.org Subject: Re: Bad performance on alpha? (make buildworld) Message-ID: <20040225193550.GM7567@dragon.nuxi.com> In-Reply-To: <20040223192103.59ad7b69.lehmann@ans-netz.de> References: <20040223192103.59ad7b69.lehmann@ans-netz.de>
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On Mon, Feb 23, 2004 at 07:21:03PM +0100, Oliver Lehmann wrote:
> I run several buildworld's on both, an Alpha EV56 and a Intel PII. I'm
> wondering that the Pentium beats the Alpha. Both systems have INVARIANTS*
> and WITNESS* disabled. Furthermore, no special tweakups - nearly "out of
> the box" configured.
Build the same target arch on both machines. 'buildworld' times across
platforms are never comparable.
alpha-ev56:/usr/src# time make TARGET_ARCH=sparc64 buildworld
p-ii:/usr/src# time make TARGET_ARCH=sparc64 buildworld
(pick an target arch other than alpha or i386: ia64, sparc64, powerpc,
amd64 to make sure neither platform has an advantage in the buildworld
steps)
Even this isn't a fair comparison as you've got to build the cross tools
and that will be way different on the two platforms. So what you really
want to do, is do a full cross-build, and then rebuild only stage4 and
time that. See /usr/src/Makefile.inc1 to figure out the internal
targets.
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