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Date:      Wed, 15 Dec 1999 01:12:54 -0700
From:      Brett Glass <brett@lariat.org>
To:        David Scheidt <dscheidt@enteract.com>
Cc:        Jamie Bowden <ragnar@sysabend.org>, Terry Lambert <tlambert@primenet.com>, noslenj@swbell.net, chat@FreeBSD.ORG
Subject:   Re: dual 400 -> dual 600 worth it?
Message-ID:  <4.2.0.58.19991215010917.048dfae0@localhost>
In-Reply-To: <Pine.NEB.3.96.991214215754.44414A-100000@shell-1.enteract. com>
References:  <4.2.0.58.19991214174918.04736140@localhost>

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At 09:07 PM 12/14/1999 , David Scheidt wrote:

> > Multiprocessing has always been a stopgap measure to get extra performance
> > out of a machine until uniprocessors caught up. The diminishing returns
>
>But uniprocessors will never catch up.  

Actually, uniprocessors often do best in price/performance, because multiprocessor
servers are priced so high and CPUs represent such a large precentage of the price
of the system. 

>The glue needed to build an N-way
>machine will always be less expensive than N uniprocessor boxes.  

Not so. The special chip sets are usually priced at a premium.

> > make tightly coupled multiprocessing far less desirable than loosely
> > coupled (or uncoupled!) distributed computing.
>
>For some applications loosely coupled multi-processing makes sense.  For
>others, like operations on one datastream, it doesn't.  

Actually, a Web page that draws images from several servers via IMG
tags is very much like an "operation on one datastream," very neatly
distributed.

--Brett



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