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Article #522

Re: Dual Celeron's and SMP Performance Problems

#522
From: kuhn
Date: Thu, 27 May 1999 00:00
87 lines
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!




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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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