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Presentation transcript:

Turing’s Curse July 26, 2013 John Graham-Cumming

A LONG, LONG TIME AGO...

The Mother of All Demos

WHAT’S NEW?

I’ve got a bad feeling about this

CLOUD COMPUTING

Cloud Computing

BIG DATA

Big Data in

VIRTUAL MACHINE HYPERVISOR

Virtual Machine Hypervisor

HYPERTEXT

Hypertext

HYPERTEXT WITH CLICKABLE LINKS

Hypertext with clickable links

MARKUP LANGUAGES

Markup Languages IBM Generalized Markup Language – 1960s

FIBRE OPTIC NETWORKING

Fibre Optic Networking

WIRELESS NETWORKING

Wireless Networking –

ETHERNET

Ethernet

SOLID STATE DISKS

SSDs – 4MB in

PROCESSOR ARCHITECTURE

Processor Architecture RISC (1960s Cray; 1980s) CISC (1960s IBM mainframes) Instruction and Data Caching (1960s; IBM System/360) Instruction Pipelining and Prefetch (1961 IBM Stretch; ) Branch Prediction (1961 IBM Stretch) Vector processor (1974 STAR-100)

INTERNETWORKING

Internetworking Chat – 1967 (NLS later Unix Talk) File Transfer – 1971 (FTP) – 1971 (host to host) Remote Procedure Calls – 1975 (RFC 707)

GRAPHICAL USER INTERFACE

GUI – Xerox 8010 (1981)

GUI – Apple Lisa (1983)

INTERNET TCP/IP –

FUNCTIONAL PROGRAMMING LISP – 1958 APL ML –

OBJECT ORIENTED PROGRAMMING Simula 1 – 1967 C Smalltalk

CONCURRENT PROGRAMMING CSP – 1978 Ada Occam –

EVENT DRIVEN PROGRAMMING PL/

DECLARATIVE LANGUAGES SQL – 1979 Regular Expressions – 1970s

HIGH WATER MARK IS (ROUGHLY) 1983

IMPLICATIONS

THE THING YOU ARE DOING HAS BEEN DONE BEFORE There’s great value in computer science education

WE ARE IN THE AGE OF GREAT PRODUCTIVITY Be thankful all that stuff’s been invented already

WE HAVE YET TO CONQUER UNRELIABILITY

Ada Lovelace (1840s)

Grace Hopper (1947)

Maurice Wilkes (1950s) As soon as we started programming, we found to our surprise that it wasn't as easy to get programs right as we had thought. Debugging had to be discovered. I can remember the exact instant when I realized that a large part of my life from then on was going to be spent in finding mistakes in my own programs.

Donald Knuth (1990s) Question from audience: “Which programming language do you prefer Java or C++?” Knuth: “Which has the better debugger?”

TURING’S CURSE 1936: There is no program that, given a description of an arbitrary computer program, can decide whether the program finishes running or continues to run forever.

WORK ON RELIABILITY Help programmers make fewer mistakes Help programmers find their mistakes