Question

What is Parallel Task in C#?

Answer 1

.Net 4.0 added a new feature of Parallel Programming. This Parallel Programming can be done using Task Parallel Library (TPL). This library is available from the namespace System.Threading.Tasks.

 

The Task Parallel Library (TPL) is the base of the Task-based programming. It consists of:

• Task class is used to do the unit of work you will code for instead of the previous thread model.
• Parallel class is a static class that exposes a task-based version of some parallel-nature problems. 

If the same work is to be done with more than 1 worker then what do I need to write?

1. Stopwatch watch = new Stopwatch();  
2. watch.Start();  
3. System.Threading.Tasks.Parallel.For(0, 15, index =>  
4. {  
5.     Console.WriteLine("Digging completed for " + index + "mts. area ");  
6.     Thread.Sleep(1000);                   
7. }  
8. );  
9. watch.Stop();  
10. Console.WriteLine("Time required time for Parallel digging: " + watch.Elapsed.Seconds); 

Output

 

 

As you can see the difference in timing required by a worker to complete the task single-handedly and by more than 1 respectively. This gives a huge improvement in execution timing when Parallel. For is used.

 

Another alternative is by using Parallel. ForEach that is similar to a foreach loop.