Parallel Programming in Visual Studio 2010Sasha Goldshtein

Senior Consultant, Sela Grouphttp://blogs.microsoft.co.il/blogs/sasha

Agenda

• Overview and Roadmap• Architecture, Design Patterns• Explicit and Implicit Parallelism• Synchronization Mechanisms• Coordination Data Structures• Debugging and Profiling• Other Technologies

Overview and Roadmap

• Shipping in .NET 4.0– Task Parallel Library– Parallel LINQ– Task Scheduler

• Shipping in Visual Studio 2010– Debugging and profiling enhancements– Don’t forget the native tools (ConcRT)

• Disclaimer: This is Beta software

Visual Studio 2010 &Visual Studio 2010 & Framework 4.0Framework 4.0

Architecture

• Pipeline• Partitioning• Grid

Explicit Parallelism

• Task.Factory.StartNew• Parent-child relationships• Continuations• Futures• Exception handling• Cancellation

Implicit Parallelism

• Parallel.For, Parallel.ForEach• Parallel.Invoke• Custom partitioner

Very Implicit Parallelism

• Parallel LINQ• Ordered vs. Unordered• foreach vs. ForAll• Cancellation

Synchronization Mechanisms

• Barrier• CountdownEvent• ManualResetEventSlim• SemaphoreSlim• SpinLock• SpinWait• Lazy initialization

Coordination Data Structures

• Lock-free data structures• Concurrent queue• Concurrent stack, dictionary• Concurrent bag (work-stealing)• ThreadLocal<T>

Concurrency Design Patterns

• Worker patterns– Producer-consumer (BlockingCollection<T>)– Completion port / thread pool (Task)– Automatic pipelining / partitioning– APM coordination (Task.Factory.FromAsync)

• Smart collections patterns– Safe/unsafe, read/write– Cyclic buffer

Debugging in Visual Studio 2010

• Parallel Stacks• Parallel Tasks

Profiling in Visual Studio 2010

• Core utilization• Thread blocking, Thread migration

Incubation and Other Technologies

• STM.NET• Axum (ex. Maestro)• CHESS• Windows 7 256-core support• Windows 7 User-Mode Scheduler

Summary

• The next generation parallel technologies and tools are here

• Download Visual Studio 2010 Beta 1

Additional Resources

• msdn.com/concurrency• code.msdn.microsoft.com/ParExtSamples• msdn.microsoft.com/en-us/library/

dd460693(VS.100).aspx• channel9.msdn.com/tags/Parallel+Extensions/

Thank You!

Sasha GoldshteinSenior Consultant, Sela Group

http://blogs.microsoft.co.il/blogs/sasha