Re: [TUHS] {TUHS] Interesting Commentary on Unix from Multicians

[Larry Stewart <stewart@serissa.com>]

I worked for Vic at the Digital Cambridge Research Lab. Entirely awesome.  Another Vic story is how he got sent to visit the Pave Paws radar on Cape Cod because the locals were worried that software errors in the phased array controls could zap the populace.
Vic talked to the radar people and found out that there was a hardware stop that prevented beam angles below 3 degrees, so there was no need to worry about bugs.

Vic would always remember what the original problem was, rather than get lost in irrelevant details.

-L

> On Apr 9, 2022, at 7:48 AM, Douglas McIlroy <douglas.mcilroy@dartmouth.edu> wrote:
> 
> 
>> 
>> Single Level Storage is an awesome concept and removes so many ugly
>> hacks from algorithms that otherwise have to process data in files.
> 
> This was Vic Vyssotsky's signature contribution to Multics, though in typical
> Vyssotsky fashion he never sought personal credit for it. Other awesome
> Vyssotsky inventions:
> 
> BLODI (block diagram), the first data-flow language, for sample-data systems.
> 
> Parallel flow analysis (later reinvented and published  by John Cocke). Vic
> installed this in Fortran to produce diagnostics such as, "If the
> third branch of IF
> statement 15 is ever taken, then variable E will be used before being set".
> 
> Darwin, the original game of predation and self-reproduction among programs.
> Corewars.org keeps a descendant version going 60 years later.
> 
> A minimum-spanning-tree algorithm quite different from the well-known methods
> due to his colleagues Bob Prim and Joe Kruskal, again unpublished.
> 
> Not long ago on TUHS, Andrew Hume told how Vic found the same isolated bug in
> dc by mathematically generating hard cases that Andrew stumbled on by accident,
> 
> As you may infer, Vic is one of my personal computing heroes.
> 
> Doug