Date: Mon, 12 Feb 2001 16:24:19 -0800 From: Kent Stewart <kstewart@urx.com> To: Matt Dillon <dillon@earth.backplane.com> Cc: Dag-Erling Smorgrav <des@ofug.org>, Greg Lehey <grog@lemis.com>, Danny Braniss <danny@cs.huji.ac.il>, freebsd-hackers@FreeBSD.ORG Subject: Re: soft updates performance Message-ID: <3A887EB3.6BDD7648@urx.com> References: <E14RurO-0000Zl-00@cs.huji.ac.il> <xzp7l2wc6v6.fsf@flood.ping.uio.no> <20010213095300.D2178@wantadilla.lemis.com> <xzp3ddjpjlk.fsf@flood.ping.uio.no> <200102122343.f1CNhd053320@earth.backplane.com>
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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
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