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Invited Talk at TU Dortmund
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Martin Lippert
June 05, 2023
Programming
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Invited Talk at TU Dortmund
Martin Lippert
June 05, 2023
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Transcript
Martin Lippert, Spring Tools Lead & Sustainability Ambassador @ VMware
June 2023 Invited Talk TU Dortmund
Why are you here?
Who am I ?
Software Engineer
Spring Tools Lead
None
VMware Apple Google Xerox PARC Stanford University Meta Intel Tesla
How I started
Schneider CPC 664 Z80 processor @ 4Mhz, 64 KB RAM
https://de.wikipedia.org/wiki/Amstrad_CPC#/media/Datei:Schneider_664_en.jpg 1985
Atari 1040 ST Motorola 68000 processor @ 8Mhz, 1024 KB
RAM @ Bill Bertram, 2006, https://de.wikipedia.org/wiki/Atari_ST#/media/Datei:Atari_1040STf.jpg
Atari TT 030 Motorola 68030 processor @ 32Mhz, 4 MB
RAM https://de.wikipedia.org/wiki/Atari_TT#/media/Datei:Atari_TT030.JPG
Apple Power Macintosh 6100 PowerPC 601 @ 60Mhz, max 72
MB RAM MIKI Yoshihito - https://www. fl ickr.com/photos/mujitra/13981566927/
On the software side?
None
Today
Software is everywhere
Software changes the world
How to develop truly great software?
Structure
Design Patterns Elements of Reusable Object-Oriented Software by Erich Gamma,
Richard Helm, Ralph Johnson, John Vlissides
Refactoring Improving the Design of Existing Code by Martin Fowler
Feedback Cycles
JUnit
Test-Driven Development
Test Driven Development By Example by Kent Beck
User Feedback
"Real Artists Ship" Steve Jobs
Agile Software Development
Extreme Programming Explained by Kent Beck
Distributed Systems
APIs and Evolution
Eat Your Own Dogfood
Test at scale
"Hello World" always work
Massive amounts of data
public long calculate(List<Order> orders) { long sum = 0; for(int
i = 0; i < orders.size(); i++) { sum += orders.get(i).getPrice(); } return sum; } What is the problem here?
Complexity Matters
t(n) = n6 vs. t(n) = 2n 103 machines in
parallel 109 operations per second n = 100 1s universe doesn’t exist long enough
"software is getting slower more rapidly than hardware is becoming
faster" Wirth’s Law
Back to the beginning
Running on Motorola 68030 processor @ 32Mhz, 4 MB RAM
What comes next?
Vulnerabilities CVEs are now part of your daily life
GenAI (probably more ML + LLM than intelligence)
Decarbonization super important
"The best way to predict the future is to invent
it" Alan Kay
Thank You for listening Martin Lippert @martinlippert