Developer Conference 2011 MICROSOFT USER GROUP KOLKATA
TPLTask Parallel Library^ – Data FlowTasksSankarsan Bose12th November , 2011
Parallel Programming As It Evolves- Higher level constructs to handle pipeline scenarios - Earlier DevLabs - CTP Data Flow Tasks .NET 4.5 Preview 1 Coordination Data Task Parallel Parallel Structure Library Programming in .NET 4.0 Threads Till .NET 3.5 to ta Care of concurrency requirements
Pipelines And Data Flow Networks- A linear series of producer/consumer stages - Output of one stage -> Input of another- Stages of pipeline are supposed to process input in specified order- Data Flow networks are more general form of pipelinesInput Stage1 Stage 2 Stage N Output
Image Pipeline – An Example Input Image Load Image Original Image s Scale Image Filter Image Thumbnails Filtered Images Display Image This is sequential… How it makes sense in Parallel World???
What type of tasks Stages Can Do?- Receive an input and process it.- Receive an input, buffer it and send it to another stage- Receive an input, transform the input and send the output to another stage- Receive input from multiple stages and join/combine the inputs to produce the output
TPL DataFlow Blocks IDataFlowBloc- Stages should be able k - Handle input ISourceBlock ITargetBlock - Produce output - Buffer data - Perform Processing- Stages are modeled as Data Flow Blocks- Data Flow Blocks can be - Source Block – Generate data - Target Block - Accept data
TPL DataFlow Blocks(Contd..)- Built-In Data Flow Blocks - Buffering Blocks - BufferedBlock - BroadCastBlock - Executor Blocks - ActionBlock - TransformBlock - TransformManyBlock - Join Blocks - JoinBlock - BatchBlockLet’s Go To The Code….
Built In Data Flow Blocks Input ActionBlock Task Input BufferBlock Original Task Input BroadcastBlock Copy Task Copy Copy TransformBlock Input Tas Output k Input JoinBlock 1 Tas Output k Input 2
References- Parallel Programming with Microsoft Visual C++ by Colin Campbell and Ade Miller- Patterns Of Parallel Programming by Stephen Toub- Introduction To TPL DataFlow by Stepehen Toub- Samples in http://parallelpatterns.codeplex.com/
Thanks Everybody, For YourTime. Coding…..Enjoy Learning..Happy