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From: bill@ism780c.UUCP (Bill Lee)
Newsgroups: comp.unix.xenix,comp.sys.ibm.pc
Subject: Re: Dhrystone for 386 Unix
Message-ID: <7492@ism780c.UUCP>
Date: Tue, 13-Oct-87 00:30:38 EDT
Article-I.D.: ism780c.7492
Posted: Tue Oct 13 00:30:38 1987
Date-Received: Wed, 14-Oct-87 06:32:21 EDT
References: <1435@van-bc.UUCP> <4275@zen.berkeley.edu>
Organization: Interactive Systems Corp., Santa Monica CA
Lines: 25
Keywords: dhystone 80386
Summary: Compaq Deskpro 386/20 dhrystones
Xref: mnetor comp.unix.xenix:946 comp.sys.ibm.pc:9005

> This is still pretty slow.  This is what I get for our PC Designs 386
> (386 @ 16Mhz w/ 64k static RAM cache, using MSC 4.0: cl -AS -W2 -Ox,
> small model, 286 code, optimize w/ no stack checking & relaxed aliasing):
> 
> 	Dhrystone (1.1) registers	4668
> 	Dhrystone (1.1) noregisters	4621
> 

I note that the Compaq Deskpro 386/20 running 386/ix 1.0.3 (ISC's
version of UNIX V.3/386) produces the following numbers:

	Dhrystone (1.1) registers	9226	(Greenhills 1.8.2H)
	Dhrystone (1.1) noregisters	9186	(Greenhills 1.8.2H)

A C version of the whetstone benchmark runs in 52 sec. of real time
using the same Greenhills compiler. That's for 1 million Whetstone
instructions, approximately 1.15 MWhets when using the 387.

The Greenhills C compiler does very well on the Dhrystone. Standard
UNIX V.3/386 RCC numbers are in the 5770 range (registers). The stock
Intel AT/386 motherboard typically turns Dhrystones in the 3500 range.
Other 16 MHz AT/386 machines seem to range between 3000 and 4500 when
running UNIX and using the standard 386 RCC compiler. The 20 MHz Compaq
Deskpro 386/20 with it's 20 Mhz 386 and cache is the fastest AT/386 that
I've actually used.