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Article #522Re: Dual Celeron's and SMP Performance Problems
From: kuhn
Date: Thu, 27 May 1999 00:00
Date: Thu, 27 May 1999 00:00
87 lines
4734 bytes
4734 bytes
In comp.os.linux.hardware Totally Lost <idletime@my-deja.com> wrote: : There are a number of applications that will benefit from : dual Celerons. The warning, is that a number of app's will not, : and may even perform worse. For those that are able to learn : from other experiences, this is a valuable heads up. A normal single-CPU home-system is about $1000. for an additional $150 you get a potential speedup of 100% (in real life somewhere beetween 60-80% when the application takes effekt of the second CPU) To have the same PII power that would about $700, and the speedup maybe 70-90% - of course, always depending on the application. 10-20% more speed for 50% more money? Only if i need it! : Did you try SpecWeb, NetBench, WebBench : or TCP-C benchmarks which by most industry standards represent a : "heavy load"? Not yet. Please give me the URLs for those, and i will do them. : An Oracle data base server under modest load has a working set of : between 3-9MB. A Web server under moderate load has a working set : of between 500K-6MB. An NFS/SMB fileserver under moderate load has : a working set of 400K-2MB. In each of these applications, the difference : between 128K and 512K L2 cache is significant, most really benefit from : 1M L2 caches. The idiot that tries to save $150 by using Celerons, : just degraded the systems capacity under load by 80% or more for : loads like these. Of course, it doesn't make sense to save 5% money and to loose 20% speed, but i am not talking of Indistrie Computers that are >$3K, but of home-machines that should be near $1K. And in this price-range, i experienced a speedup of 80% at 20% more in price - for my favorite application (compiling), of course. :> 2) if i realy had a mission critcal Server under heavy load, then i :> would buy a _real_ Computer (i am not talking of Xeons) : I don't know what you might think a real computer is, but a Dual Xeon : or Katmai server with 5 channel software raid, clustered by two or : four, can deliver the performance (and possibly the reliability) : of almost any big iron server less than $250K a few years ago, : at around or less than 10% the cost. I was talking about the Brain-Dead intel-Architecture inside and outside the CPU! (Even with a MC68000/8 you can stand harder real-time requirements than with an PIII/500 - application depended) PCs have an awfull and non-deterministic architecture. It is realy the worst technology you can buy for money - but they are realy cheap! That is the reason, why i didnt't bought a _real_ computer, but a Dual Celeron :-) : I used to think that the : dual 370/165's I worked on at the bank some years back was a real : computer ... My notebook today is faster and has more disk, but : lacks the printer capacity of the 27 1401N2's with AN chains, and : the input capacity of the MICR farm. Have a look at AXP, Sparc, MIPS and maybe PowerPC-based machines. those i would say are real computers :-) I am sure, my home-dual-celeron can't stand the load of our old Alpha-Server 266 (1/6 the speed) when 30 people are working on it! But for what i (and many others) am doing at home, the celerons are the better choice! -- ------------------------------------------------------------------- | Bernhard Kuhn (kuhn[at]lpr.ei.tum.de) O|||OO||OO| | | Laboratory for Process Control and Real-Time Systems O|||O|O|O|O | | Technische Universit�t M�nchen Tel.+49-89-289-23732 O|||OO||OO| | | 80290 M�nchen, Germany Room 3944 Fax -23555 OOO|O|||O|O | --------------------------------------------------------------------
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From: kuhn@lpr.e-technik.tu-muenchen.de.nospam
Subject: Re: Dual Celeron's and SMP Performance Problems
Date: 1999/05/27
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