Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!bloom-beacon!gatech!rutgers!ucsd!ucbvax!decwrl!sun!aeras!elxsi!beatnix!rw
From: rw@beatnix.UUCP (Russell Williams)
Newsgroups: comp.arch
Subject: Re: Superoptimiser.
Message-ID: <833@elxsi.UUCP>
Date: 5 Jul 88 15:19:21 GMT
References: <28200172@urbsdc> <2530@winchester.mips.COM>
Sender: news@elxsi.UUCP
Reply-To: rw@beatnix.UUCP (Russell Williams)
Organization: ELXSI Super Computers, San Jose
Lines: 17

In article <2530@winchester.mips.COM> mash@winchester.UUCP (John Mashey) writes:
>360/91, of which maybe (on the order of) 20 were built;
>there was also a 360/95 that was a little faster.
>It is instructive to examine this, compared with, for example, the
>360/85, which was built at aboutthe same time (late 60s).
>The complexity of the 360/91 occurred because the CPU was too much faster
>than the memories.
>The 360/85 used a cache instead, was more cost-effective.  Certainly
>the later machines derive more from its ideas than from the 91.

   The 195 was basically a 91 with a cache.  The 91 spent its time waiting
on memory unless you did mostly FP.  SLAC does, & a friend of mine there
said that for her work, the 91 was much faster than the 3033. 

Russell Williams
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