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- Newsgroups: comp.sys.super
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- From: jet@boxer.nas.nasa.gov (J. Eric Townsend)
- Subject: Re: What are people paying for when they by a supercomputer?
- In-Reply-To: Patrick F. McGehearty's message of Tue, 17 Nov 1992 19:28:04 GMT
- References: <1992Nov15.201147.5302@athena.mit.edu> <46021@ogicse.ogi.edu>
- <JET.92Nov17104503@boxer.nas.nasa.gov>
- <1992Nov17.192804.4410@news.eng.convex.com>
- Sender: news@nas.nasa.gov (News Administrator)
- Organization: Numerical Aerodynamic Simulation, NASA Ames
- Date: 17 Nov 92 16:56:16
- Message-ID: <JET.92Nov17165616@boxer.nas.nasa.gov>
- Lines: 43
-
- "patrick" == Patrick F. McGehearty <patrick@convex.COM> writes:
- JET == jet@boxer.nas.nasa.gov (J. Eric Townsend)
-
- JET>Blinking lights. Lots and lots of blinking lights....
-
- patrick> have suggestions for specific hardware events that might be
- patrick> connected to blinking lights on a massively parallel shared
- patrick> memory super?
-
- I sorta like the ipsc/delta/sigma solution:
- - one for cpu active
- - <something> for communication
- - one for node failure
-
- I've seen more than one person debug their code on the ipsc/860 by
- sitting in front of the cabinet and watching the led's.. "See, it hung
- in computation after the third massive data shuffle..."
-
- I'd also like to have some sort of cray-like debugging panel where I
- could get information like:
- - register (including control registers) information for a specific
- node
- - examine arbitrary memory addresses (yeah, right :-)
-
- While we're at it, how about a led for each transistor in each chip?
- It'd only take what, ~1mil led's for a i860? Let's see, that's a
- 1000x1000 pixel grid, and at 400dpi (using Kodak(?)'s new 400dpi lcd),
- that's about 2.5x2.5in.
-
- With a 3'x6' panel, we're looking at roughly 15x30 such lcds, giving
- us the ability to examine the cpus of 450 nodes of a reasonably large
- sigma... Another door's worth would probably give us all the support
- chips. The real problem comes with ram: 1MB of 9-bit parity ram would
- take a cell 7"x7" to show each bit... Oh well, maybe just light up a
- point based on the parity bit to show bad memory?
-
- This is getting out of hand, I suspect...
-
-
- --
- J. Eric Townsend -- jet@nas.nasa.gov -- 415.604.4311
- '92 R100R, DoD# 0378, BMWOA, AMA, ACLU, EFF, CPSR
- "HotHead Rules!"
-