Parallel LINQ

Parallel LINQ is a concurrency execution engine from Microsoft that can be used to execute LINQ queries in parallel by leveraging the multicore processors. It is a part of the managed concurrency library called Parallel Extensions Library. The Parallel Extensions library is comprised of the following:

• Task Parallel Library (TPL)

• Parallel LINQ (PLINQ)

In their MSDN article, Running Queries On Multi-Core Processors, Joe Duffy and Ed Essey state:

"PLINQ is a query execution engine that accepts any LINQ-to-Objects or LINQ-to-XML query and automatically utilizes multiple processors or cores for execution when they are available."

The reference is available at: http://msdn.microsoft.com/en-us/magazine/cc163329.aspx.

The following code snippet illustrates how PLINQ can be used:

Int32[] data = new Int32[100];
   for (intintvar index = 0; index < 100; data[index] =
   index + 1, index++);
   var result = from x in data.AsParallel() select x;
   result.ForAll(p => Console.WriteLine...