Path: utzoo!mnetor!uunet!husc6!mit-eddie!uw-beaver!cornell!batcomputer!itsgw!imagine!pawl16.pawl.rpi.edu!jesup
From: jesup@pawl16.pawl.rpi.edu (Randell E. Jesup)
Newsgroups: comp.arch
Subject: Re: What's a Vax 11/780 MIP really?
Message-ID: <558@imagine.PAWL.RPI.EDU>
Date: 20 Mar 88 02:48:07 GMT
References: <413@mn-at1.UUCP>
Sender: news@imagine.PAWL.RPI.EDU
Reply-To: beowulf!lunge!jesup@steinmetz.UUCP
Organization: RPI Public Access Workstation Lab - Troy, NY
Lines: 23

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.

	That's why people specify 11/780 Vax MIPS, not VAX MIPS.

     //	Randell Jesup			      Lunge Software Development
    //	Dedicated Amiga Programmer            13 Frear Ave, Troy, NY 12180
 \\//	beowulf!lunge!jesup@steinmetz.UUCP    (518) 272-2942
  \/    (uunet!steinmetz!beowulf!lunge!jesup) BIX: rjesup

(-: The Few, The Proud, The Architects of the RPM40 40MIPS CMOS Micro :-)