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F# Functional and MultiCore Programming
- 2. Quem sou eu? Rodrigo Vidal Twitter: @rodrigovidal Blog: www.rodrigovidal.net •Focado em Arquitetura de Software e Boas Práticas. •Agilista e entusiasta de F# e IronRuby/Ruby. •Membro ativo do grupo .NetArchitects •Professional Scrum Developer •Presente no maiores eventos do tecnologia do país.
- 3. Agenda • MultiCore • Functional Paradigm • F# Language
- 4. Functional Programming • Velho Paradigma • 52 anos hoje • Ignorado pelo MainStream até agora
- 5. Functional – Why now? • Novo desafios • Processar grandes quantidades de dados • Escalabilidade para Cores e Clusters • Declarative Programming
- 6. Why another language? • Programação Funcional está por ai a um longo tempo. – Não é algo novo – Tem uma longa história • Programação Funcional é “safe” – Devemos nos preocupar principalmente quando lidamos com aplicações MultiCore e de Cloud Computing • Programção Funcional está crescendo!
- 7. “What” rather than “How” Imperativo Vs. Declarativo
- 8. Quem usa ForEach() ? | List<string> res = new List<string>(); foreach(Product p in Products) { if (p.UnitPrice > 75.0M) { res.Add(String.Format("{0} - ${1}", p.ProductName, p.UnitPrice)); } } var res = from p in Products where p.UnitPrice > 75.0M select string.Format("{0} - ${1}", p.ProductName, p.UnitPrice); return res;
- 9. Domain Driven Design Foco no Core Domain, revelando a intenção do seu código. Interfaces Reveladoras de Intenções
- 10. Concurrency-Friendly Imperative-Problems: •É dificil tornar codigo sequencial em paralelo. •É dificil usar “Shared States” e “Locks”
- 11. The Functional Paradigm • Immutable Data • Ability to compose functions • Functions can be thread as data • Lazy Evalution • Pattern Matching
- 12. Immutability “Values are immutable by default”
- 13. Side-Effects – Also knowed as “The Butterfly Effect” • A side effect – Modifies some state – Has observable interaction with calling functions – Has observable interaction with the outside world – Example: a function or method with no return value
- 14. Composing Functions f(x) = 3x+2 g(y) = 4y-1 g(f(2)) = ? f(x) g(x)
- 15. Motivação
- 16. #Inception
- 17. Language Evolution http://channel9.msdn.com/posts/Charles/Simon-Peyton-Jones-Towards-a-Programming-Language-Nirvana/ C#, VB, Java, C are imperative programming languages. Very useful but can change the state of the world at anytime creating side effects. Nirvana! Useful and Safe Haskell is Very Safe, but not very useful. Used heavily in research and academia, but rarely in business. F#F#
- 18. F# Evolution
- 19. What is F#? • Functional language developed by Microsoft Research – By Don Syme and his team, who productized Generics – Based on OCaml (influenced by C# and Haskell)
- 20. F# 1.0 Functional + Objects + .NET
- 21. F# 2.0 Functional + Objects + .NET + Async + Parallel + Interactive + Scripting
- 22. F# 2.0 Functional + Objects + .NET + Async + Parallel + Interactive + Scripting
- 23. F# 2.0 • Succinct, Expressive, Functional – Productive, simple, powerful, and fun language • Parallel, Explorative, Data-rich, Algorithmic – Extends the .NET platform to important new audiences • Innovative, Industry/Platform-Leading – Async, parallel, easy-objects, immutability, tuples, units- of-measure • Note: F# is not a replacement for C#/VB/C++ – Complementary, interoperable and augments and builds on .NET as multi-lang platform
- 24. let demo = “Code!”
- 26. The Free Lunch is Over
- 27. Why not 10GHz?
- 29. Parallel Pattern Library Resource Manager Task Scheduler Task Parallel Library Parallel LINQ Threads Native Concurrency Runtime Managed Libraries ThreadPool DataStructures DataStructures Tools Async Agents Library UMS Threads Microsoft Research Visual Studio 2010 Parallel Debugger Windows Profiler Concurrency Analysis Race Detection Fuzzing AxumVisual F# Managed Languages Rx Native Libraries Managed Concurrency Runtime DryadLINQ Research / Incubation Research / Incubation Visual Studio 2010 / .NET 4 Windows 7 / Server 2008 R2 HPC Server Operating System Parallel Computing and PDC09
- 30. Imperative Parallelism Declarative Data Parallelism CODE!
- 31. Amdahl’s Law (1 / percent of time spent in sequential processing) Limits of Parallelism
- 32. GPU – Beyond CPU CODE!
- 33. The F#ture
- 34. Latest Books about F#
Notas del editor
- List&lt;string&gt; res = new List&lt;string&gt;(); #1 foreach(Product p in Products) { #2 if (p.UnitPrice &gt; 75.0M) { res.Add(String.Format(&quot;{0} - ${1}&quot;, p.ProductName, p.UnitPrice)); #3 } } var res = from p in Products where p.UnitPrice &gt; 75.0M #1 select string.Format(&quot;{0} - ${1}&quot;, p.ProductName, p.UnitPrice); #2 return res;
- C# Parallel.For(1,inp.Length-1,i =&gt; { var sum = inp[i-1] + inp[i] + inp[i+1]; res[i] = sum / 3; }); F# let pfor nfrom nto f = Parallel.For(nfrom, nto + 1, Action&lt;_&gt;(f)) pfor 1 (inp.Length-2) (fun i -&gt; let sum = inp.[i-1] + inp.[i] + inp.[i+1] res.[i] &lt;- sum / 3 )
- The key idea behind the declarative style of programming is that the code doesn&apos;t specify how exactly it should be executed. Execution is provided by a minimal number of primitives such as select and where in LINQ or map and filter in F#, and these primitives can behave in a sophisticated way.
- The key idea behind the declarative style of programming is that the code doesn&apos;t specify how exactly it should be executed. Execution is provided by a minimal number of primitives such as select and where in LINQ or map and filter in F#, and these primitives can behave in a sophisticated way.
- The key idea behind the declarative style of programming is that the code doesn&apos;t specify how exactly it should be executed. Execution is provided by a minimal number of primitives such as select and where in LINQ or map and filter in F#, and these primitives can behave in a sophisticated way.
- The key idea behind the declarative style of programming is that the code doesn&apos;t specify how exactly it should be executed. Execution is provided by a minimal number of primitives such as select and where in LINQ or map and filter in F#, and these primitives can behave in a sophisticated way.