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Parallel Extensions

Parallel Extensions. A glimpse into the parallel universe. Eric De Carufel eric.decarufel@orckestra.com eric@decarufel.net http://blog.decarufel.net. Online retail and distribution Overture Solutions Enterprise Portals and ECM Content Management, Collaboration, (Intranet)

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Parallel Extensions

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  1. Parallel Extensions A glimpse into the parallel universe Eric De Carufel eric.decarufel@orckestra.com eric@decarufel.net http://blog.decarufel.net

  2. Online retail and distribution Overture Solutions Enterprise Portals and ECM Content Management, Collaboration, (Intranet) Office Business Solutions Partners Service Portals (Extranet) Customer Service Portals (Internet) Business Process Automation EAI, SOA, ESB Search Fast ESP (A Microsoft Subsidiary) SharePoint Server 2007 Search Endeca IAP (Information Access Platform) Dynamics CRM 4.0 Sales Force Automation xRM applications Core Expertise E-Commerce platform Enterprise platform Integration platform Search platforms Business platforms

  3. Partners Strategic Partners Technology Partners Consulting Partners

  4. Clients

  5. Whoam’I? • Eric De Carufel is solution architect at Orckestra • Over 15 years experience in software development • Bell Canada, Centre de Rechercehd’emploi St-Denis, Fédération Québécoise de Karaté, AXA Canada Tech, Provigo (5 projects), Metro-Richelieu (2 projects), Imagina, be@com, Unipage, APLC, Viasystems, Montreal Jewish Hospital, AGTI, CCQ, Ogilvy Renault, Ivanhoé Cambridge, Microcell (Fido), Cirque du Soleil, TELUS, PSP Investment, CGI, Deutsche Bank, Orckestra, Sobeys, Jean-Coutu, Xtranormal • Started with an ADAM computer by Coleco • Working with .NET since version 1.0

  6. Agenda • Introduction • Overview • Library Core • TPL (Task Parallel Library) • Parallel Linq (PLINQ) • Parallel Data Structures • Questions

  7. Introduction • Why do we have to bother? • Moore’s law is over, no more free lunch • The Power Wall • The Complexity Wall (Instruction-Level Parallelism) • The Memory Wall • The Reliability Wall • Multi cores systems will be more and more available

  8. Introduction • Type of Parallelism • Asynchronous operation (better user experience) • Data parallelism • Task parallelism • Options • Manual treading • Thread, ThreadPool, BackgroundWorkerThread • Asynchronous calls • Event driven • Problems • Resource sharing • Locking • Non-deterministic sequence of execution • Hard to debug

  9. Overview

  10. TaskParallel Library (TPL) • Lightweight task framework (Task) • Create(Action<T>) factorymethod • Wait, WaitAll, WaitAny to catch exception • ContinueWith to chainTaskstogether • Lazy function call • Future<T> • Task scheduler and manager • TaskManager

  11. Demo TaskParallel Library (Task, Future, TaskManager)

  12. Parallel API • Parallel Loops • Parallel.For • Parallel.ForEach • Lazy Initialisation • LazyInit<T> • Locking • SpinWait • SpinLock • CountdownEvent

  13. Parallel API • Standard for loop • for (inti = 0; i < N; i++){ a[i] = Compute(i);} • Parallel for loop • Parallel.For(0, N, i=>{ a[i] = Compute(i);});

  14. Demo Parallel API (Parallel.For, Parallel.ForEach)

  15. Parallel Linq (PLINQ) • Parallel Query • AsParallel() • Return to sequential execution • AsSequential() • Preserve order • AsOrdered() • Order doesn’t matter • AsUnordered()

  16. Parallel Linq (PLINQ) • var query = from c in Customers where c.Name = “Smith” select c; • var query = from c in Customers.AsParallel() where c.Name = “Smith” select c;

  17. Demo ParallelLinq (PLINQ)

  18. Parallel Data Structures • IConcurrent Collection • Add(T item) • Remove(out T item) • ConcurrentStack • Push(T item) • TryPop(out T item) • ConcurrentQueue • Enqueue(T item) • TryDequeue(out T item) • BlockingCollection • Add(T item), • Remove(out T item) • TryAdd(T item), • TryRemove(out T item)

  19. Demo Parallel Structure (IConcurrentCllection, BlockingCollection, …)

  20. User Mode Scheduler For Tasks CLR Thread Pool: Work-Stealing Local Queue Global Queue Local Queue … Worker Thread 1 Worker Thread p … Task 6 Task 3 Task 4 Task 1 Program Thread Task 5 Task 2

  21. More Demo ContinueWith, Lambda, LazyInit

  22. What’snext • Visual Studio 2010 • .NET Framework 4.0 • New multi cores computer (4, 16, 32, 64, …) • Think parallel! • Thread safety will save your life

  23. Call to action • Parallel FX Team blog • http://blogs.msdn.com/pfxteam/ • Visual Studio 2010 • Look for the next release • Eric De Carufel • http://web.decarufel.net/contact

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