From owner-freebsd-current@FreeBSD.ORG Fri Sep 29 14:24:11 2006 Return-Path: X-Original-To: current@freebsd.org Delivered-To: freebsd-current@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id D276016A403; Fri, 29 Sep 2006 14:24:11 +0000 (UTC) (envelope-from ru@rambler-co.ru) Received: from relay0.rambler.ru (relay0.rambler.ru [81.19.66.187]) by mx1.FreeBSD.org (Postfix) with ESMTP id 3DBB643D60; Fri, 29 Sep 2006 14:24:05 +0000 (GMT) (envelope-from ru@rambler-co.ru) Received: from relay0.rambler.ru (localhost [127.0.0.1]) by relay0.rambler.ru (Postfix) with ESMTP id D82615EC1; Fri, 29 Sep 2006 18:24:04 +0400 (MSD) Received: from edoofus.park.rambler.ru (unknown [81.19.65.108]) by relay0.rambler.ru (Postfix) with ESMTP id B65545EB6; Fri, 29 Sep 2006 18:24:04 +0400 (MSD) Received: (from ru@localhost) by edoofus.park.rambler.ru (8.13.8/8.13.8) id k8TEO5YY005923; Fri, 29 Sep 2006 18:24:05 +0400 (MSD) (envelope-from ru) Date: Fri, 29 Sep 2006 18:24:05 +0400 From: Ruslan Ermilov To: Astrodog Message-ID: <20060929142405.GA5875@rambler-co.ru> References: <20060929141709.E70454@fledge.watson.org> <20060929134332.GD4776@rambler-co.ru> <20060929144738.W70454@fledge.watson.org> <2fd864e0609290707t7e7d6e17g61a09ff5aa10ff3f@mail.gmail.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="d6Gm4EdcadzBjdND" Content-Disposition: inline In-Reply-To: <2fd864e0609290707t7e7d6e17g61a09ff5aa10ff3f@mail.gmail.com> User-Agent: Mutt/1.5.13 (2006-08-11) X-Virus-Scanned: No virus found Cc: Robert Watson , current@freebsd.org Subject: Re: lockf in installworld -- not a good idea X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 29 Sep 2006 14:24:11 -0000 --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--