.NET Parallel Programming

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

Parallelism Blockers - .NET Parallel Programming

Are deadlocks still possible with await?

April 12, 2012 Apr 12, 2012 04/12/12
Stephen Toub - MSFT
Developers familiar with parallel programming are also familiar with a wide range of potential problems that can occur when practicing the art.  One of the most well-known issues is “deadlock,” where two or more operations are waiting on each other to complete in a manner such that none of them will be able to complete.I&rsquo...

Achieving Speedups with Small Parallel Loop Bodies

June 6, 2009 Jun 6, 2009 06/6/09
Stephen Toub - MSFT
The Parallel class represents a significant advancement in parallelizing managed loops.  For many common scenarios, it just works, resulting in terrific speedups.  However, while ideally Parallel.For could be all things to all people, such things rarely work out, and we’ve had to prioritize certain scenarios over others.One ...

Concurrent, Multi-core Programming on Windows and .NET

October 28, 2008 Oct 28, 2008 10/28/08
Stephen Toub - MSFT
Thanks to everyone who attended our PDC pre-conference session yesterday on parallelism and concurrency!  We had a wonderful turnout at the event, and David, Joe, and I all had a terrific time. Attached to this post are the slides we presented. (It turns out that the PDC site does allow you to submit an evaluation for a precon.  If ...

Feedback requested: TaskManager shutdown, Fair scheduling

August 1, 2008 Aug 1, 2008 08/1/08
Stephen Toub - MSFT
One of the primary reasons we've released CTPs of Parallel Extensions is to solicit feedback on the design and functionality it provides.  Does it provide all of the APIs you need to get your job done?  Are there scenarios you wished the APIs supported and that you need to work around in klunky ways?  And so forth.  We've ...

PLINQ Ordering

June 11, 2008 Jun 11, 2008 06/11/08
essey
There is a natural tension between ordering and performance in a parallel partitioning system such as PLINQ, which we addressed as guidance in the Dec07 CTP documentation:  “Although you can opt into ordering, this does come at a cost to performance because it constrains the options which PLINQ can use for executing a query, so it ...

Parallel loop performance

March 13, 2008 Mar 13, 2008 03/13/08
Stephen Toub - MSFT
We've received several questions on the MSDN Forums for Parallel Extensions about the performance of the Parallel class, and specifically of the loop constructs we provided in the CTP.  We're very much aware that the performance of Parallel.For/ForEach in the CTP is not optimal, and that for some situations, the overhead for these ...

Task Parallel Library on Channel 9

February 19, 2008 Feb 19, 2008 02/19/08
Stephen Toub - MSFT
Charles from Channel 9 sat down with several of us from the Parallel Computing Platform team to discuss the Task Parallel Library component of Parallel Extensions. A video of the conversation is now available on Channel9: https://channel9.msdn.com/Showpost.aspx?postid=384229. We hope you like it, and as always, feedback is ...