Date: Fri, 5 Nov 1999 10:47:30 -0800 (PST) From: "Eric J. Schwertfeger" <ejs@bfd.com> To: "Rodney W. Grimes" <freebsd@gndrsh.dnsmgr.net> Cc: Adam Strohl <adams@digitalspark.net>, "Daniel O'Connor" <doconnor@gsoft.com.au>, Darryl Okahata <darrylo@sr.hp.com>, freebsd-smp@FreeBSD.ORG Subject: Re: Dual Celeron + FreeBSD? Message-ID: <Pine.BSF.4.10.9911051041430.16049-100000@harlie.bfd.com> In-Reply-To: <199911051829.KAA57885@gndrsh.dnsmgr.net>
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On Fri, 5 Nov 1999, Rodney W. Grimes wrote: > > I've done make buildworld's on both my dual Celeron and my dual PPro (the > > ones with 512K cache). The difference between single and dual celeron is > > minimal, about 10%. On the dual PPro machine, the speed improvement, > > using the same disk subsystem, was 80%. Yes, on processes that aren't > > memory intensive, dual Celerons rock. In fact, on most things, I see > > closer to 40-50% improvement with dual Celerons, the make buildworld is > > rather memory intensive. > > Actually make buildworld is disk intensive... SMP plain out does not > seem to help it much, unless of course you run a non-standard make > world with -pipe, which then does make the memory bandwidth demand > higher, and if both sides of the pipe just happen to get split accross > 2 processors it causes the small cache to be ineffective and the memory > system to be a major stall point. Can't remember if I was using -pipe, this was a default 3.2 install, except that I'm pretty sure I was using soft updates. I may have been, because the HD lights would only flicker every few seconds, so it definitely wasn't disk bound. I had /usr/src, /usr/obj, and /tmp all on seperate spindles (each on a 4GB 7200 RPM SCSI drive). Given other people's comments, I'd really expect more than the 10% that I saw. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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