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From: caf@omen.UUCP
Newsgroups: comp.sys.m68k,comp.sys.intel
Subject: Re: Re: Recent Motorola ad seen in Byte
Message-ID: <513@omen.UUCP>
Date: Fri, 10-Apr-87 20:46:14 EST
Article-I.D.: omen.513
Posted: Fri Apr 10 20:46:14 1987
Date-Received: Tue, 14-Apr-87 23:52:11 EST
References: <362@sbcs.UUCP> <1466@ncr-sd.SanDiego.NCR.COM> <580@plx.UUCP> <930@intsc.UUCP>
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Organization: Omen Technology Inc, Portland Oregon
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Xref: utgpu comp.sys.m68k:328 comp.sys.intel:137

In article <930@intsc.UUCP> tomk@intsc.UUCP (Tom Kohrs @fae) writes:

:Show me a benchmark that does not fit in 256 bytes thats even keeps up
:with at 16MHz 386.  386's are now shipping at 20MHz for the speed freaks.
:25MHz soon.

Well, here's one that takes 8k, somewhat larger than 256 bytes.  A 25 mHz
68020 board more than keeps up with a 18 mHz 386 box (let alone 16 mHz.)

The Computer Dynamics 386 uses an Intel 386 motherboard goosed to 18 mHz,
apparently without ill effect.  The system uses all 32 bit Intel ram (2.5
MB total including 32 bit memory expansion board).  Note that the IBM top
of the line PC2 20 mHz 386 machine is specified at one wait state, same as
my box.

I have been told that the best 68k C compilers usually beat the code density
of 8086/286 C compilers but have not verified this for myself.

Before Intel flames these numbers, I suggest they provide me a hotter
386 chip and/or 386 Unix, and I shall post updated numbers once I have
made sure they represent real systems.  My address is below.

I should also like to run this benchmark on the 386 in 286 pinouts chip
PC-WEEK announced a few weeks ago. I have two PC-AT machines ready
to go.


Compile - Link		Execute	Code
Real	User	Real	User	Bytes	System

7.4	.8	.34	.3416	124	Definicom SYS 68020 25mHz SiVlly 11/86
11.8	2.8	.56	.56	131	CompDyn (Intel MB) + 386 Toolkit 12/86

	Sieve benchmark (Slightly modified from Byte Magazine version)
		12-07-86 Chuck Forsberg Omen Technology Inc


NOTE: If the resulting time is too short to measure with a precision of
a couple of percentage points, increase the number of outer loops (n) to
1000 or (if running on vaporware microcomputers) to 1000, and scale the
result accordingly. 

siev.c:
#define S 8190
char f[S+1];
main()
{
/*	register long i,p,k,c,n;	For 32 bit entries for PC */
	register int i,p,k,c,n;
	for (n = 1; n <= 10; n++) {
		c = 0;
		for (i = 0; i <= S; i++) f[i] = 1;
		for (i = 0; i <= S; i++) {
			if (f[i]) {
				p = i + i + 3; k = i + p;
				while (k <= S) { f[k] = 0; k += p; }
				c++;
			}
		}
	}
	printf("\n%d primes.\n", c);
}

Chuck Forsberg WA7KGX Author of Pro-YAM communications Tools for PCDOS and Unix
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