Introduction to TPL
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TPL(Task Parallel Library)에 대한 소개입니다. 데모 코드 - Multi Threading https://github.com/gyuwon/DotNetPractice/blob/master/Tasks/MultiThreading/Program.cs - Shard Resource Access https://github.com/gyuwon/DotNetPractice/blob/master/Tasks/SharedResourceAccess/Program.cs - Continuation https://github.com/gyuwon/DotNetPractice/blob/master/Tasks/Chapters/Program.cs - Parallelism Performance https://github.com/gyuwon/DotNetPractice/blob/master/Tasks/ParallelismPerformance/Program.cs - foreach vs. ForAll https://github.com/gyuwon/DotNetPractice/blob/master/Tasks/ForAll/Program.cs
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Introduction to TPL
- 2. Background
- 3. Thread • 운영체제가 프로세서 자원(CPU Time)을 할당하는 기본 단위 • Multi Threading • Parallel Processing • UI & Background Tasks • Shared Resource Access
- 4. DEMO Multi Threading Shared Resource Access
- 5. Thread Pool • 큐에 입력되는 작업들을 작업자 스레드에 할당해 처리 • Recycling Thread Pool Thread Thread Thread … Work Item Queue
- 6. Future • 아직 결정 여부가 확실하지 않은 값에 대한 계산 작업 및 노출 • Future가 생성될 때 값은 결정되어 있거나 결정되어 있지 않음 • 값이 반환되는 시점에는 값이 결정되어 있음 • Promise
- 7. Tasks
- 8. Task • Task ≠ Thread • Task is a ‘Work Item’ (IThreadPoolWorkItem) • Future • Awaitable • Task Scheduler
- 9. Default Task Scheduler Thread Pool Worker Thread Local Queue Worker Thread Local Queue Global Queue Task Task Task Task Task Task Task Task … … … … LIFO LIFO FIFO Work Stealing
- 10. Start protected internal override void QueueTask(Task task) { if ((task.Options & TaskCreationOptions.LongRunning) != 0) { Thread thread = new Thread(…); thread.IsBackground = true; thread.Start(task); } else { … ThreadPool.UnsafeQueueCustomWorkItem(task, …); } }
- 11. FromAsync internal static Task FromAsyncImpl(IAsyncResult asyncResult, …) { … Task t = new Task(…); if (asyncResult.IsCompleted) { t.InternalRunSynchronously(…); } else { ThreadPool.RegisterWaitForSingleObject(…); } … }
- 12. Result • TResult Task<TResult>.Result • 작업이 완료된 상태이면 즉시 반환 • 작업이 완료되지 않은 상태이면 완료될 때까지 대기
- 13. Continuation • Task 완료 후 실행 할 Task를 생성 • ContinueWith • GetAwaiter
- 14. ContinueWith internal void ContinueWithCore(Task continuationTask, ...) { … if (!continuationTask.IsCompleted) { … // Attempt to enqueue the continuation bool continuationQueued = AddTaskContinuation(…); // If the continuation was not queued (because the task completed), then run it now. if (!continuationQueued) continuation.Run(this, …); } }
- 18. Parallel Query Query from e in query where … select … Parallel Query from e in query.AsParallel() where … select …
- 19. DEMO Performance
- 20. foreach vs. ForAll foreach ForAll Proc A Proc A Proc A … Proc B Proc A Proc A Proc A … Proc B Proc B Proc B …