More Than Java Concurrency
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This document summarizes a presentation about concurrency models beyond what is available in Java. It discusses share-state concurrency using locks and synchronization in Java. It also covers share-nothing concurrency using the actor model and message passing. Additionally, it discusses software transactional memory and data-flow concurrency. The presentation provides examples and case studies of applying these different concurrency approaches.
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More Than Java Concurrency
- 1. More Than Java Concurrency Darren.Wang( 强) Thursday, January 20, 2011
- 2. Agenda More Than Java Concurrency? What’s More? Several Concurrency Models/Patterns Case Study Questions? The end Thursday, January 20, 2011
- 3. Why concurrency? Thursday, January 20, 2011
- 4. What concurrency offers reduce latency divide and conquer, run in parallel reduce the latency hide latency asynchronous increase throughput more tasks can be run without wasting available computing power Thursday, January 20, 2011
- 5. What we do with Java Concurrency State , That’s all of the about. Atomicity - keep state intact Visibility - make right state access Thursday, January 20, 2011
- 6. When Things Go Wrong Thursday, January 20, 2011
- 7. What If ... Thursday, January 20, 2011
- 8. What We Will Talk Today Share-State Concurrency Share-Nothing Concurrency Software Transaction Memory Data-Flow Concurrency Thursday, January 20, 2011
- 9. Share-State Concurrency Thursday, January 20, 2011
- 10. JMM Simplified Picture borrowed from <<Java >> Thursday, January 20, 2011
- 11. JMM escalation Thursday, January 20, 2011
- 12. How to deal with? How many ways can you count? Here we go... Thursday, January 20, 2011
- 13. Immutability immutable anytime Immutable Object immutable before publishing Map & ConcurrencyMap (1)To Find More in book <<Java Concurrency In Practice>> Thursday, January 20, 2011
- 14. Confinement Thread Confinement Thread-Specific Variables(ThreadLocal) Stack Confinement Method Stack Scope Thursday, January 20, 2011
- 15. Synchronization Synchronized Block(Implicit Lock) Explicit Lock Volatile (Partial Synchronization Support) Thursday, January 20, 2011
- 16. Gotchas With Synchronization Deadlock how to prevent it? Live lock Starvation Thursday, January 20, 2011
- 17. Gotchas With Synchronization Deadlock how to prevent it? Resource Re-ordering Live lock Starvation Thursday, January 20, 2011
- 18. Gotchas With Synchronization Deadlock how to prevent it? Resource Re-ordering Periodic Retry Live lock Starvation Thursday, January 20, 2011
- 19. Performance Tuning with Synchronization reduce the time of holding locks break global locks into fine-grained locks what coming next? Thursday, January 20, 2011
- 20. CAS Compare-And-Set | Compare-And-Swap java.util.concurrent.atomic after Java5 AtomicInteger AtomicLong AtomicBoolean AtomicReference Thursday, January 20, 2011
- 21. Section Conclusion Pessimistic Model Lock-Based Optimistic Model Lock-Free Thursday, January 20, 2011
- 22. Share-Nothing Concurrency Thursday, January 20, 2011
- 23. Share-Nothing Concurrency AKA. Message Passing Concurrency Confinement In a Big Picture Thursday, January 20, 2011
- 24. Actor Model First proposed by Carl Hewitt in 1973 improved by Gul Agha An Actor Can: change internal state send messages to peer actors create new actors migrate to another computing host Thursday, January 20, 2011
- 25. Actor Rocks more light weight event based actors of akka can create 6.5million on 4 G RAM (600 bytes each) much easier, just send messages counter ! tick Thursday, January 20, 2011
- 26. Actors Available Erlang Platform Scala Platform TBA, EBA Lift Actor, Akka Actor Java Platform Kilim, SALSA(simple actor language, system and architecture) Other Thursday, January 20, 2011
- 27. Actor Almighty? when we really have shared states, e.g. bank account? when we need to form unified consensus when we need synchronous behavior a bit verbose compared to method dispatch Thursday, January 20, 2011
- 28. Section Conclusion Actor Model Rocks In Some Situations, But not all Share Nothing Simplify the Architecture Design Prefer Share Nothing to Share State If Possible Thursday, January 20, 2011
- 29. You Know Lego, Right? Thursday, January 20, 2011
- 30. Case Study I Session Management Centralized Storage memcached, database... Client-Specific Storage secure cookie other local-storage mechanism Thursday, January 20, 2011
- 31. Case Study II Map-Reduce When Share Nothing can rock in When Share State Is a Must Thursday, January 20, 2011
- 32. Case Study III Symmetric Cluster Share Nothing Asymmetric Cluster Share State Thursday, January 20, 2011
- 33. STM Software Transaction Memory Transaction operations execute in the own thread in parallel, commit will cause One to be successful and others to abort or retry Thursday, January 20, 2011
- 34. Sounds Familiar? Optimistic Model Can be nested Simple Programming Model Thursday, January 20, 2011
- 35. Available Solutions Clojure Concurrent Haskell STM .Net More... Thursday, January 20, 2011
- 36. Cons All operations in scope of a transaction: need to be idempotent can’t have side-effects Memory Concern Conflicting Rate Concern Thursday, January 20, 2011
- 37. Section Conclusion optimistic model simple programming model with restrictions which may cause limitations(MS drops STM) Thursday, January 20, 2011
- 38. Data-Flow Concurrency AKA. Declarative Concurrency Thursday, January 20, 2011
- 39. Have you ever... Thursday, January 20, 2011
- 40. Features Single Assignment Variables Data-States trigger process flow Thursday, January 20, 2011
- 41. Available Languages LabView Thursday, January 20, 2011
- 42. Usage Scenarios Signal Process System Thursday, January 20, 2011
- 43. Typical Operations create a data-flow variable wait for the variable to be bound bind the variable Thursday, January 20, 2011
- 44. Limitations Can’t have side-effects Exceptions IO Others Thursday, January 20, 2011
- 45. Section Conclusion Data Based Concurrency Thursday, January 20, 2011
- 46. comparison of common facilities Executor (Agent) Actor (HawtDispatch) STM Transactor(Actor + STM) Thursday, January 20, 2011
- 47. Thursday, January 20, 2011
- 48. Thank You Thursday, January 20, 2011
- 49. The End Thursday, January 20, 2011