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From: ian@loral.UUCP (Ian Kaplan)
Newsgroups: net.arch
Subject: Re: Floating point performance
Message-ID: <1260@loral.UUCP>
Date: Wed, 8-Oct-86 15:30:17 EDT
Article-I.D.: loral.1260
Posted: Wed Oct  8 15:30:17 1986
Date-Received: Fri, 10-Oct-86 00:42:13 EDT
References: <340@euroies.UUCP>
Reply-To: ian@loral.UUCP (Ian Kaplan)
Organization: Loral Instrumentation, San Diego
Lines: 49

In article <340@euroies.UUCP> shepherd@euroies.UUCP (Roger Shepherd) writes:
> 
>                                 kWhets   MWhets/MFLOP
>                                                    (normalised)
>   Intel 80286/80287    (8 Mhz)   300         3.2      1.0
>   NS 30032 & 32081    (10 Mhz)   128         1.3      0.4
>   MC 68020 & 68881 (16 & 12.5)   755         2.5      0.8
> 
>   Inmos IMS T414B-20             663         7.4      2.3
> 

  These figures are interesting.  I am surprised at the figure for the
  80287.  Intel uses this processor on the Intel Cube, which has very
  poor floating point performance.  The above table suggests that
  reasonable floating point performance could be achieved increasing the
  clock rate.  It is not clear to me that this is born out by reality.
  Does anyone have floating point performance numbers for a 12.5 MHz
  80287?

  
> 
>Also, I don't quite know why Ian likes the CLIPPER (three
>chips on the picture of the (large) module I've seen) but
>dislikes the NS 32310 (four chips); they seem to give the
>same MFLOP rating. (Does anyone have Whetstone figures for
>these two?)
> 

  The Whetstone figure for the 32310 is 1.137 MWhets and 0.8 MFLOP.

  I like the Clipper because I have the impression that is uses less board
  space and power than a 32032, a 32310 and two Weitek chips.
  There are other considerations that must be taken into account also,
  like the history of a product line.

>
>-- 
>Roger Shepherd
>INMOS Limited, 1000 Aztec West, Almondsbury, Bristol, BS12 4SQ, GB
>USENET: ...!euroies!shepherd
>PHONE: +44 454 616616


		     Ian Kaplan
		     Loral Dataflow Group
		     Loral Instrumentation
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