^^Kernighan, Ritchie, Thompson.

Unix

Brian Kernighan 1942-  wp

Brian Kernighan speaks at a tribute to Dennis Ritchie at Bells Labs. 7 September 2012

He worked at Bell Labs and contributed to the development of Unix alongside Unix creators Ken Thompson and Dennis Ritchie.

Dennis Ritchie  1941-2011  wp

in-memory-of-dennis-ritchie, passed away at the age of 70, a few days after Steve Jobs. 

He created

• the C programming language (1972-73)
• the Unix operating system with long-time colleague Ken Thompson, closely intertwined with the development of C.

He wrote

• "The C Programming Language" book, with Brian_Kernighan, sometimes termed K&R, after its authors' initials.

Dennis Ritchie and Ken Thompson won the prestigious Turing_Award for their work on UNIX

Ken Thompson  1943-   wp

ken thompson, dennis ritchie 1973

he designed and implemented the original Unix operating system

Rob(ert) Pike 1956- wp

• co-developed the Go programming language
• at Bell Labs was a member of the Unix team
• co-developed the Blit graphical terminal for Unix;
  before that he wrote the first window system for Unix in 1981

The_Unix_Programming_Environment  by  Kernighan & Pike 1984

The_Practice_of_Programming  by  Kernighan & Pike 1999

Rob Pike's 5 Rules of Programming

1. You can't tell where a program is going to spend its time.
   Bottlenecks occur in surprising places, so
   • don't try to second guess and put in a speed hack

   until you've proven that's where the bottleneck is.

2. Measure. Don't tune for speed until you've measured, and even then don't unless one part of the code overwhelms the rest.
3. Fancy algorithms are slow when n is small, and n is usually small. Fancy algorithms have big constants. Until you know that n is frequently going to be big, don't get fancy. (Even if n does get big, use Rule 2 first.)
4. Fancy algorithms are buggier than simple ones, and they're much harder to implement. Use simple algorithms as well as simple data structures.
5. Data dominates. If you've chosen the right data structures and organized things well, the algorithms will almost always be self-evident. Data structures, not algorithms, are central to programming.

Comment

• Rules 1&2 restate "Premature optimization is the root of all evil."
  (Tony Hoare's famous maxim)
• Rules 3&4 as "When in doubt, use brute force." by Ken Thompson.
  Rules 3&4 are instances of the design philosophy KISS.
• Rule 5 was previously stated by Fred Brooks in The Mythical Man-Month.
  Rule 5 is often shortened to "write stupid code that uses smart objects".

ref: https://users.ece.utexas.edu/~adnan/pike.html

Go language wp

https://go.dev/doc/faq

yt Gopherfest 2015 | Go Proverbs with Rob Pike

https://go.dev/blog/go-fonts

Douglas_McIlroy  1932-  wp

ref: wikimedia

Douglas_McIlroy (left)

Links

Linguaggi di programmazione; esempi.