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From: rchrd@well.UUCP (Richard Friedman)
Newsgroups: net.arch
Subject: Re: Cray-2 impressions
Message-ID: <224@well.UUCP>
Date: Tue, 15-Oct-85 12:33:47 EDT
Article-I.D.: well.224
Posted: Tue Oct 15 12:33:47 1985
Date-Received: Thu, 17-Oct-85 00:51:54 EDT
References: <1189@ames.UUCP>
Distribution: net
Organization: Whole Earth Lectronic Link, Sausalito, CA
Lines: 25
Summary: Questions about the CRAY-2

In article <1189@ames.UUCP>, eugene@ames.UUCP (Eugene Miya) writes:
> I had call to go visit the Cray-2 downstairs.  It's tiny. ...

Gene:
  Is it true that the CRAY-2 cpu is really a CRAY-1  (not an X-MP)
cpu, meaning that it has only one path to memory and doesnt do
chaining?  So the only major speedup between the X-mp and -2
cpu's is the faster clock cycle of the 2,  4.1 ns.
Also, I understand that the 256K 64-bit memory is slower than the
memory on the x-mp, but there is a fast 16K memory cache per processor.
So it really looks like a CDC 7600!!
Question is, will the Y-MP be faster?  (16 processors, 64Mwords)

Have you looked at the Cray-2 compiler... I hear its based on the old
CFT1.10 and doesnt have character data (yet).
I'd like to see some comparison timings between the x-mp and the 2.



-- 
     
    [rchrd] = Richard Friedman
              Pacific-Sierra Research, 2855 Telegraph #415
              Berkeley, CA 94705 (415) 540 5216
    UUCP: {hplabs,ptsfa,dual}!well!rchrd