Path: utzoo!mnetor!uunet!husc6!uwvax!uwslh!jiml
From: jiml@uwslh.UUCP (James E. Leinweber)
Newsgroups: comp.arch
Subject: Re: What's a Vax 11/780 MIP really?
Message-ID: <310@uwslh.UUCP>
Date: 21 Mar 88 18:49:08 GMT
Organization: U of Wisconsin-Madison, State Hygiene Lab
Lines: 17

I can't say what a VUP really is.  But most of the current
calculations strike me as worthless, since you can't correctly figure the
instruction issue rate of a pipelined machine by dividing the average
cycles executing an instruction into it's clock rate.  And assuming it has
one true clock speed is not necessarily valid either; we just
installed a variable speed clock on our obsolescent Vax 11/750.
Current machines are complex enough (variable instruction times, clock
speeds, cache effects, etc.) that no apriori calculation is going to
get you a MIPS figure.  Benchmarks, anyone? :-)

Jim Leinweber		jiml@uwslh.uucp		jiml%uwslh.uucp@cs.wisc.edu
 ...!{rutgers, ucbvax, ihnp4, ...}!uwvax!uwslh!jiml
State Laboratory of Hygiene @ Univ. of Wisconsin - Madison; (608) 262-8092
-- 
Jim Leinweber		jiml@uwslh.uucp		jiml%uwslh.uucp@cs.wisc.edu
 ...!{rutgers, ucbvax, ihnp4, ...}!uwvax!uwslh!jiml
State Laboratory of Hygiene @ Univ. of Wisconsin - Madison; (608) 262-8092