1. A Pictorial Introduction to Components in Scientific Computing

2. 2 Once upon a time... Input Output Program

3. 3 As Scientific Computing grew...

4. 4 Tried to ease the bottle neck

5. 5 SPMD was born. 21 34 21 34 2 1 3 4

6. 6 SPMD worked. 21 34 21 34 2 1 3 4 But it isn’t easy!!! But it isn’t easy!!!

7. 7 Meanwhile, corporate computing was growing in a different way Input Output Program browser spreadsheet editor graphics database multimedia email client Unicode Input

8. 8 This created a whole new set of problems complexity browser spreadsheet editor graphics database multimedia email client Unicode l Interoperability across multiple languages l Interoperability across multiple platforms l Incremental evolution of large legacy systems (esp. w/ multiple 3rd party software)

9. 9 Component Technology addresses these problems

10. 10 So what’s a component ??? Implementation : No Direct Access Interface Access : Generated by Tools Matching Connector : Assigned by Framework Hidden from User

11. 11 1. Interoperability across multiple languages C C++ F77 Java Python Language & Platform independent interfaces Automatically generated bindings to working code

12. 12 2. Interoperability Across Multiple Platforms Imagine a company migrates to a new system, OS, etc. What if the source to this one part is lost???

13. 13 Transparent Distributed Computing internet These wires are very, very smart!

14. 14 3. Incremental Evolution With Multiple 3rd party software v 1.0 v 2.0 v 3.0

15. 15 Now suppose you find this bug... v 1.0 v 2.0 v 3.0

16. 16 Good news: an upgrade available v 1.0 v 2.0 v 3.0 Bad news: there’s a dependency 2.1 2.0

17. 17 v 3.0 2.1 2.0 Great News: Solvable with Components

18. 18 v 1.0 Great News: Solvable with Components 2.1 v 3.0 2.0

19. 19 Why Components for Scientific Computing Complexity l Interoperability across multiple languages l Interoperability across multiple platforms l Incremental evolution of large legacy systems (esp. w/ multiple 3rd party software) Sapphire SAMRAI Ardra Scientific Viz DataFoundry Overture linear solvers hypre nonlinear solvers ALPS JEEP

20. 20 The Model for Scientific Component Programming Science Industry ? CCA

21. 21 The End