.NET Parallel Programming

All about Async/Await, System.Threading.Tasks, System.Collections.Concurrent, System.Linq, and more…

November 2011 - .NET Parallel Programming

How to use C++ AMP from C# using WinRT

November 11, 2011 Nov 11, 2011 11/11/11
Igor Ostrovsky - MSFT
[Updated 5/17/2012 for Visual Studio 11 Beta] In a previous article, How to use C++ AMP to C#, we described how you can use P/Invoke to call into C++ AMP and accelerate your C# apps on GPUs and other heterogeneous hardware. In this post, we'll take a look at how the same task becomes easier in Windows 8 using WinRT. Before attempting to call C...
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New in .NET 4.5: ThreadLocal.Values

November 10, 2011 Nov 10, 2011 11/10/11
Igor Ostrovsky - MSFT
Available since .NET 4, ThreadLocal<T> is a container that holds a separate value for every thread. In practice, ThreadLocal<T> is often convenient for storing per-thread counters, resources, or partial results. As mentioned earlier on this blog, we have been thinking about adding a Values property to enumerate over the values ...

PLINQ Queries That Run in Parallel in .NET 4.5

November 10, 2011 Nov 10, 2011 11/10/11
Igor Ostrovsky - MSFT
One interesting thing to know about PLINQ is that not all queries are guaranteed to execute in parallel (See PLINQ Queries That Run Sequentially for reference). You can think of the AsParallel method as a hint to run in parallel for query shapes that it believes will be faster. By default, PLINQ prefers to use a simple sequential algorithm ...

Crafting a Task.TimeoutAfter Method

November 10, 2011 Nov 10, 2011 11/10/11
Joe Hoag
Imagine that you have a Task handed to you by a third party, and that you would like to force this Task to complete within a specified time period. However, you cannot alter the “natural” completion path and completion state of the Task, as that may cause problems with other consumers of the Task. So you need a way to obtain a copy or “...

Exception Handling in TPL Dataflow Networks

November 9, 2011 Nov 9, 2011 11/9/11
Cristina Manu
A “dataflow block” is represented by a class implementing the IDataflowBlock interface. The state of a dataflow block is represented by the state of its IDataflowBlock.Completion Task, which itself has a Status property. When a dataflow block is in active state, meaning that it is currently doing processing or may do more processing in the...

ConcurrentDictionary Performance Improvements in .NET 4.5

November 8, 2011 Nov 8, 2011 11/8/11
Igor Ostrovsky - MSFT
ConcurrentDictionary is a popular concurrent data structure that was introduced in .NET 4. In the .NET 4.5 release, ConcurrentDictionary gets two performance improvements. One optimization is related to the way ConcurrentDictionary avoids torn reads and writes. To explain the background, all reference types and some value types are guaranteed...

Updated Async CTP

November 1, 2011 Nov 1, 2011 11/1/11
Stephen Toub - MSFT
In April, we released the Async CTP Refresh, and since then we've seen fantastic adoption of the technology.  We've also seen the technology landscape evolve.  Windows Phone 7.5, aka "Mango", was released.  Silverlight 5 has had both a Beta and an RC release.  And there have been multiple patches to Visual Studio and the ....