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Parallel Extensions

Parallel Extensions. A glimpse into the parallel universe. By Eric De Carufel Microsoft .NET Solution Architect at Orckestra eric.decarufel@orckestra.com eric@decarufel.net http://blog.decarufel.net. Who am’I ?. Eric De Carufel is solution architect at Orckestra

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Parallel Extensions

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  1. Parallel Extensions A glimpse into the parallel universe By Eric De Carufel Microsoft .NET Solution Architect atOrckestra eric.decarufel@orckestra.com eric@decarufel.net http://blog.decarufel.net

  2. 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 • My coworkers call me .NET Jedi

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

  4. Introduction • Why do we have to bother? • Moore’s law is over, no more free lunch • Multi cores systems will be more and more available • 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

  5. Overview

  6. 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

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

  8. 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);});

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

  10. 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;

  11. Parallel Data Structures • IConcurrentCollection • 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)

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

  13. Demo Time

  14. 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

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