Date: Fri, 29 Sep 2006 18:24:05 +0400 From: Ruslan Ermilov <ru@freebsd.org> To: Astrodog <astrodog@gmail.com> Cc: Robert Watson <rwatson@freebsd.org>, current@freebsd.org Subject: Re: lockf in installworld -- not a good idea Message-ID: <20060929142405.GA5875@rambler-co.ru> In-Reply-To: <2fd864e0609290707t7e7d6e17g61a09ff5aa10ff3f@mail.gmail.com> References: <20060929141709.E70454@fledge.watson.org> <20060929134332.GD4776@rambler-co.ru> <20060929144738.W70454@fledge.watson.org> <2fd864e0609290707t7e7d6e17g61a09ff5aa10ff3f@mail.gmail.com>
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--d6Gm4EdcadzBjdND Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Sep 29, 2006 at 09:07:19AM -0500, Astrodog wrote: > Personally, I find it much, much more important to be able to do an > installworld from a "real" single user mode via NFS, than it is to support > -j. I don't think I've ever had a circumstance where I really needed make > installworld to finish quickly. >=20 This doesn't mean it's unused. For example, our release engineers build releases on fast SMP machines, and "make release" can complete faster with -j on real SMP hardware. This is btw how this bug was found in the first place. > Besides, if there's significant use of > locks in installworld, -j doesn't get a whole lot of performance gain > anyway. >=20 No, it's insignificant. > Another thought here, is that in my experience, installworld is disk, or > network I/O bound, not CPU... Under those circumstances, we may find that > there's reduced performance with -j anyway, in which case there's no > reason to support it that I can see. >=20 Do you have numbers on real SMP hardware to share? Cheers, --=20 Ruslan Ermilov ru@FreeBSD.org FreeBSD committer --d6Gm4EdcadzBjdND Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (FreeBSD) iD8DBQFFHSyFqRfpzJluFF4RAhARAJ4oDghEb1iDsQLrpweXflfWNY4AsACgnVZ6 x282oScTD5bgDPZHdDSaOyg= =2axT -----END PGP SIGNATURE----- --d6Gm4EdcadzBjdND--
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