Parallel LINQ: Run Queries On Multi-Core Processors

Nowadays Multi-core processors setup is already a standard in servers and desktop PC. Its even already being used in mobile phones and PDAs which results to power consumption benefits. Microsoft Visual Studio Team Response to Multi-core environment is the enhanced version of LINQ, the Parallel Language Integrated Query (PLINQ). This feature is available in Visual Studio .NET 10. PLINQ is a query execution engine that can accept any LINQ-to-Objects or LINQ-to-XML query and automatically utilizes multiple cores for execution when they are available.


Take a look of this LINQ code, which use only 1 core on my quad core processor desktop pc.

  IEnumerable arr = Enumerable.Range(1, 4000000);
    var x =
      from y in arr
      where IsPrime(y)
      select y.ToString();
    List mylist = x.ToList();
    Console.WriteLine(mylist.Count.ToString());

To take advantage of the other processors, we just have to change one line.

  IEnumerable arr = Enumerable.Range(1, 4000000);
    var x =
      from y in arr.AsParallel()
      where IsPrime(y)
      select y.ToString();
    List mylist = x.ToList();
    Console.WriteLine(mylist.Count.ToString());

Isn't cool?

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