Path: utzoo!utgpu!water!watmath!clyde!rutgers!ames!sdcsvax!nosc!marlin!aburto
From: aburto@marlin.NOSC.MIL (Alfred A. Aburto)
Newsgroups: comp.sys.amiga
Subject: Floating-Point Benchmark Results
Message-ID: <1018@marlin.NOSC.MIL>
Date: 19 Jan 88 20:15:17 GMT
Reply-To: aburto@marlin.nosc.mil.UUCP (Alfred A. Aburto)
Distribution: comp.sys.amiga
Organization: Naval Ocean Systems Center, San Diego
Lines: 35

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	A while back I posted some Savage Benchmark comparison results 
	here.  The Savage Results were useful but limited in that only
	(some of) the transcendental and trigonometric functions were
	tested.  I needed a floating-point add, sub, mul, and divide
	test ( a simple one ).  I tried the C FLOAT (and other programs)
	but they had problems with some of the optimizing compilers (e.g.,
	zero run times).  Anyway, I finally settled on a reasonable test
	program that seems to hold its own against most optimizing compilers
	(that I have tested).  The program calculates PI using the series   
	expansion of 4 * atan(1).  Pretty simple, but it gives reasonably
	accurate comparisons of system performance with double precision
	floating-point operations.  The main output is expressed in 
	thousands of double precision floating-point operations per second
	(KFLOPS).  KPLOPS is based on the average time it takes to do the 
	double precision +,-,*, and / operations.  This is a bit unrealistic
	because the '/' operation usually dominates since it takes the most
	time.  So the program also outputs a maximum KFLOPS based on the '+'
	operation.  With the 68881 and the Weitek 1167 this results in a 
	measure of the time to do an FADD.D register-to-register (about
	600 nanoseconds for the Weitek and 2.6 microseconds 68881 at 20 MHz).

	If there is any interest I'll post the results I have accumulated
	so far.  Most of the results are for the Amiga and Turbo-Amiga but
	there are some Sun and VAX and PC results as well.  The table of
	results is about 55 lines long.  I will also post the Fortran and
	C FLOPS programs if others would like to check it out.

	Thanks,
	Al Aburto

	aburto@marlin.nosc.mil.UUCP
	nosc!marlin!aburto       
        aburto@NOSC.MIL