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From: Bruce Young 
Newsgroups: net.unix
Subject: Re:  info on array processors wanted
Message-ID: <7469@brl-tgr.ARPA>
Date: Thu, 17-Jan-85 11:56:20 EST
Article-I.D.: brl-tgr.7469
Posted: Thu Jan 17 11:56:20 1985
Date-Received: Sun, 20-Jan-85 06:17:22 EST
Sender: news@brl-tgr.ARPA
Organization: Ballistic Research Lab
Lines: 17

Developing array processors: CRAY 2

AMES will have (late FY85) a CRAY X-MP 1/2 running under UNIX.
However, do not expect a commercial version of UNIX for CRAY
until FY86.

Using SLAM from P&A, we benchmarked two VAX 11/780's under UNIX
a CRAY X-MP 2/2 and a CRAY X-MP 1/2 both running COS. The CRAYs
demonstrated wall time improvements about 50 to 1. Thus a model
running 4 hours on VAX loaded to factor 5.0 (using ruptime)
will run on a CRAY in approximately 5 minutes. One disclaimer
is any comparison of VAX to CRAY is full of assumptions about
load averages, operating systems, configurations, yet we are
pleased with the CRAY performance. 

Bruce     
young@AMES-NAS.ARPA