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- Newsgroups: comp.sys.super
- Path: sparky!uunet!ukma!darwin.sura.net!convex!convex!patrick
- From: Patrick F. McGehearty <patrick@convex.COM>
- Subject: Re: What are people paying for when they by a supercomputer?
- Originator: patrick@mozart.convex.com
- Sender: usenet@news.eng.convex.com (news access account)
- Message-ID: <1992Nov17.192804.4410@news.eng.convex.com>
- Date: Tue, 17 Nov 1992 19:28:04 GMT
- Reply-To: patrick@convex.COM (Patrick F. McGehearty)
- References: <1992Nov15.201147.5302@athena.mit.edu> <46021@ogicse.ogi.edu> <JET.92Nov17104503@boxer.nas.nasa.gov>
- Nntp-Posting-Host: mozart.convex.com
- Organization: Engineering, CONVEX Computer Corp., Richardson, Tx., USA
- X-Disclaimer: This message was written by a user at CONVEX Computer
- Corp. The opinions expressed are those of the user and
- not necessarily those of CONVEX.
- Lines: 22
-
- In article <JET.92Nov17104503@boxer.nas.nasa.gov> jet@boxer.nas.nasa.gov (J. Eric Townsend) writes:
- >Blinking lights. Lots and lots of blinking lights....
-
- Ah, yes, blinking lights. The first parallel machine I worked on (C.mmp,
- a collection of 16 PDP-11s built at Carnegie-Mellon in the 1970's) had
- a pretty fair collection of blinking lights, and looked pretty when
- you turned the computer room lights off. Not only did each PDP-11 have
- a front panel with a row of lights, the crosspoint interconnection for the
- shared memory had 256 lights, one for each crosspoint. I have forgotten the
- original rationale for putting those lights on the crosspoint, but we
- actually diagnosed some memory conflict performance problems by watching the
- lights while an application ran. In addition, the "I'm dead" error routines
- from the processors were written to make particular patterns on the front
- panel of the PDP-11s.
-
- However, current systems have other methods for getting similar information.
- Other than being a designer preference for "flash" vs "cool", what benefits
- do lots of blinking lights offer, and what should they represent?
- I.e. Do people have suggestions for specific hardware events that might
- be connected to blinking lights on a massively parallel shared memory super?
-
- - Patrick McGehearty
-