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From: ljdickey@water.UUCP
Newsgroups: comp.sys.atari.st
Subject: Re: More ST Floating Point Performance
Message-ID: <995@water.UUCP>
Date: Thu, 11-Jun-87 14:14:56 EDT
Article-I.D.: water.995
Posted: Thu Jun 11 14:14:56 1987
Date-Received: Sat, 13-Jun-87 06:37:22 EDT
References: <1959@trwrb.UUCP>
Reply-To: ljdickey@water.UUCP (Lee Dickey)
Distribution: world
Organization: U. of Waterloo, Ontario
Lines: 21

In article <1959@trwrb.UUCP> sansom@trwrb.UUCP (Richard Sansom) writes:
>The good news is that the results were _exactly_ the same as those produced
>by the VAX 11/785.  The bad news is that the ST is still much slower than it
>should be (based on the Amiga's performance).

Richard,

Could it be that the speed of your program on the Amiga might have
something do to with the precision of the arithmetic.  I notice that
your results show the Amiga to be fast, but not too accurate.   Not too
long ago, several people sent in performance reports for something
called the "Savage Benchmark".  My recollection is that there was a
"speed-precision" trade off.  On one machine, a program compiled with
variables declared to be single precision ran faster, but were less
accurate, than the same program variables declared to be double
precision.

I wonder if that could account for your observed differences.

						Lee Dickey