From owner-freebsd-hackers Mon Feb 12 16:24:27 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from level3.dynacom.net (level3.dynacom.net [206.107.213.213]) by hub.freebsd.org (Postfix) with SMTP id A2AB837B491 for ; Mon, 12 Feb 2001 16:24:21 -0800 (PST) Received: (qmail 11308 invoked by uid 0); 13 Feb 2001 00:24:20 -0000 Received: from dsl1-160.dynacom.net (HELO urx.com) (206.159.132.160) by mail.urx.com with SMTP; 13 Feb 2001 00:24:20 -0000 Message-ID: <3A887EB3.6BDD7648@urx.com> Date: Mon, 12 Feb 2001 16:24:19 -0800 From: Kent Stewart Reply-To: kstewart@urx.com Organization: Dynacom X-Mailer: Mozilla 4.76 [en] (Windows NT 5.0; U) X-Accept-Language: en MIME-Version: 1.0 To: Matt Dillon Cc: Dag-Erling Smorgrav , Greg Lehey , Danny Braniss , freebsd-hackers@FreeBSD.ORG Subject: Re: soft updates performance References: <20010213095300.D2178@wantadilla.lemis.com> <200102122343.f1CNhd053320@earth.backplane.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Matt Dillon wrote: > > :> In fact, it's exactly the opposite. 'make world' is CPU-bound, so the > :> speed of the I/O system is irrelevant. If it were I/O bound, soft > :> updates *would* make a difference, because a number of unnecessary > :> writes would be eliminated. > : > :Read what he writes. Soft updates *did* make a difference - they > :shaved ~30% off his worldstone. It's parallelization that doesn't make > :a difference in his case, because his CPU and FSB are fast enough that > :the I/O system is left completely in the dust. This is a 900 MHz box, > :probably with a 100 MHz or 133 MHz FSB, not the old 486DX33 you have > :lying in a corner. > : > :DES > :-- > :Dag-Erling Smorgrav - des@ofug.org > > A suspect a good chunk of that is not using -pipe. I would be > interested in buildworld numbers with -pipe vs with -pipe + softupdates. > Without -pipe softupdates will make a huge difference due to temporary > file creation & deletion. > > When Kirk first tested softupdates against buildworld, he explicitly > tested it with and without -pipe and found that much of the performance > benefit (for buildworld) occured when not using -pipe. The times I reported earlier are all with -pipe and are on an AMD Thunderbird 900, with 256 MB of PC-133 memory, and using 3 - ATA-66 HD's on different controllers. The elapsed time dropped from 58:16 to 45:54 by using softupdates. Kent > > -Matt > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hackers" in the body of the message -- Kent Stewart Richland, WA mailto:kbstew99@hotmail.com http://kstewart.urx.com/kstewart/index.html FreeBSD News http://daily.daemonnews.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message