Path: utzoo!mnetor!uunet!ncc!alberta!sask!coleman
From: coleman@sask.UUCP (Geoff Coleman @ College of Engineering)
Newsgroups: comp.arch
Subject: Re: Re: What's a Vax 11/780 MIP really?
Message-ID: <1069@sask.UUCP>
Date: 23 Mar 88 22:30:47 GMT
References: <558@imagine.PAWL.RPI.EDU>
Organization: University of Saskatchewan
Lines: 56

> 
> In article <413@mn-at1.UUCP> alan@mn-at1.UUCP (Alan Klietz) writes:
> :		In October 1987, one of the authors [of the DEC
> :	study] presented a paper on the performance of the VAX
> :	8800, a dual-processor machine in which each processor
> :	is six times as fast as the 11/780, by DEC's official
> :	reckoning.  This paper reported on some preliminary
> :	measurements that showed the 8800 processor to have
> :	a cycle per average instruction (CPAI) rate of 8.4. 
> :	At cycle time of 45ns, this translates into a MIPS rating
> :	of 2.65.
> 
> 	Which goes to show that 1 8800 MIPS != 1 11/780 MIPS.  Not suprising,
> given the different memories, busses, caches, etc between an ancient old
> (but ubiquitous) Vax 11/780 and an 8800.

	For an interesting viewpoint on this see the INSIDE EDGE
column in the April 1988 edition of UNIX WORLD. According
to it a VAX 11/780 Mip is really 0.47 Mips.



Geoff Coleman                         | BITNET: Coleman@sask
College of Engineering                | UUCP: {utcsri,ihnp4}!sask!skul!geoff
University of Saskatchewan            | Compserve: 76515,1513  just a number 
Saskatoon, Saskatchewan               | voice: (306) 966-5415

	"Why does a hearse horse snicker, hauling a lawyer away?"
						- Carl Sandburg


























This is food for the stupid posting program.