.NET Parallel Programming

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

ParallelExtensionsExtras Tour – #14 – SingleItemPartitioner

(The full set of ParallelExtensionsExtras Tour posts is available here.) In a previous ParallelExtensionsExtras Tour blog post, we talked about implementing a custom partitioner for BlockingCollection<T>.  Custom partitioning is an advanced but important feature supported by both Parallel.ForEach and PLINQ, as it allows the ...

ParallelExtensionsExtras Tour – #13 – AsyncCall

(The full set of ParallelExtensionsExtras Tour posts is available here.)Producer/consumer scenarios could logically be split into two categories: those where the consumers are synchronous, blocking waiting for producers to generate data, and those where the consumers are asynchronous, such that they're alerted to data being available and only ...

Performance of Concurrent Collections in .NET 4

.NET 4 introduces new data structures designed to simplify thread-safe access to shared data, and to increase the performance and scalability of multi-threaded applications. To best take advantage of these data structures, it helps to understand their performance characteristics in different scenarios.Chunyan Song, Emad Omara and Mike Liddell ...

ParallelExtensionsExtras Tour – #12 – AsyncCache

(The full set of ParallelExtensionsExtras Tour posts is available here.)Caches are ubiquitous in computing, serving as a staple of both hardware architecture and software development.  In software, caches are often implemented as dictionaries, where some data is retrieved or computed based on a key, and then that key and its resulting ...

A Tour of Various TPL Options

The Task Parallel Library (TPL) exposes various options that give you more control over how tasks get scheduled and executed: Joseph E. Hoag's article A Tour of Various TPL Options explains these options in detail, accompanied by examples of correct and incorrect uses.(This paper and many more are available through the Parallel ...

Parallel Computing Sessions at the Visual Studio 2010 Launch

Thanks to everyone who attended our three breakout sessions at the Visual Studio 2010 Launch and DevConnections conference this week in Las Vegas.  Attached to this blog post are the slide decks that were presented at the talks.  The code from the talks is available either as part of our Parallel Programming in .NET 4 samples ...

ParallelExtensionsExtras Tour – #11 – ParallelDynamicInvoke

(The full set of ParallelExtensionsExtras Tour posts is available here.)  Delegates in .NET may have one or more methods in their invocation list.  When you invoke a delegate, such as through the Delegate.DynamicInvoke method, the net result is that all of the methods in the invocation list get invoked, one after the other.&...

ThreadPool performance you can see

We've spent a lot of time touting improvements to the .NET Framework in .NET 4 around threading, including core enhancements to the performance of the runtime itself.  Sometimes data is more powerful than words, however, and it's useful to be able to see exactly what kind of difference such improvements can make.  To assist with that...