Date: Tue, 24 Jul 2001 14:13:46 -0500 From: mikea <mikea@mikea.ath.cx> To: freebsd-stable@FreeBSD.ORG Subject: Re: question about wc on for NON-critical workstation (no flamebait) Message-ID: <20010724141346.A5878@mikea.ath.cx> In-Reply-To: <20010724184624.B71800@dogma.freebsd-uk.eu.org>; from jcm@FreeBSD-uk.eu.org on Tue, Jul 24, 2001 at 06:46:24PM %2B0100 References: <20010724180907.A71575@dogma.freebsd-uk.eu.org> <3B5DAECF.E9FE622D@mitre.org> <3B5DB1FA.1B894F9E@urx.com> <20010724184624.B71800@dogma.freebsd-uk.eu.org>
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On Tue, Jul 24, 2001 at 06:46:24PM +0100, j mckitrick wrote: > On Tue, Jul 24, 2001 at 10:35:54AM -0700, Kent Stewart wrote: > | My buildworld on a dual 866 coppermine system went from 42 minutes to 29 > | minutes. The other side effect was the -j8 parameter finally did > | something. Before that anything from -j2 on, actually made the > > I thought over -j2 was not recommended, and often broke? The recommendation I've seen is two jobs per processor. In Kent's case and mine, with dual processors, we could run with -j4 and not exceed the recommendation. Im practice, I find that -j8 (four jobs per processor, on average) works very handily in almost all cases. From time to time, a job will require a module that hasn't been built then by another job running in parallel, but a rerun of the make generally succeeds. > | buildworld run longer. I think the cpu's were starved for I/O. The > | system is built around 3-ATA-100 Maxtor 30GB HD's. The motherboard is a > | VP6 and each HD is on its own controller. Using raid-0 also slowed the > | compile down. > > A far cry from my little laptop. ;-) My box isn't quite the horse that Kent's is, but I have noticed a significant speed increase with -j8 over -j4, even with two 30GB ATA-66 HDs. I think I'll turn on write caching and live dangerously for a while. -- Mike Andrews mikea@mikea.ath.cx Tired old sysadmin since 1964 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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