Re: Bad performance on alpha? (make buildworld)

From: David O'Brien (obrien_at_freebsd.org)
Date: 02/25/04

  • Next message: Peter Jeremy: "Re: Bad performance on alpha? (make buildworld)" 
    Date: Wed, 25 Feb 2004 11:35:50 -0800
To: Oliver Lehmann <lehmann@ans-netz.de>

    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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  • Next message: Peter Jeremy: "Re: Bad performance on alpha? (make buildworld)"