Java forkJoinPool getCommonPoolParallelism() Method

The getCommonPoolParallelism() method of ForkJoinPool class is used to get the parallelism level of the common pool in the integer form.

Syntax

Parameter

No parameter is passed.

Returns

The targeted parallelism level of the common pool

Throws

Does not throw the Exception.

Example 1

import java.util.concurrent.ForkJoinPool;
	import java.util.concurrent.RecursiveTask;
                public class JavaForkJoingetcommonpoolparallelismExample1 extends RecursiveTask<Integer> {
            @Override
              protected Integer compute() {
                  try{
                       throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
                  }
                  catch(Exception e)
                  { 
                  }
                  return 0;
               }
               public static void main(String[] args) {
	      JavaForkJoingetcommonpoolparallelismExample1 left = new JavaForkJoingetcommonpoolparallelismExample1();
             JavaForkJoingetcommonpoolparallelismExample1 right = new JavaForkJoingetcommonpoolparallelismExample1();
             JavaForkJoingetcommonpoolparallelismExample1 finder = new JavaForkJoingetcommonpoolparallelismExample1();
             ForkJoinPool pool = ForkJoinPool.commonPool();
           pool.submit(left); pool.submit(right); pool.submit(finder);
	    System.out.println("Finder :" + pool.invoke(finder) + "    Active threads :" +pool.getActiveThreadCount() + " Left  " +pool.invoke(left) + " Right "+ pool.invoke(right) );
             
           System.out.println(" Parallelism level of pool :" +pool.getCommonPoolParallelism());
             }
        }

Test it Now

Output:

Finder :0    Active threads :1 Left  0 Right 0
 Parallelism level of pool :3

Example 2

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.RecursiveAction;
 class Task12 extends RecursiveAction {
     private long Load = 0;
 public Task12(long Load) {
         this.Load = Load;
    }
    @Override
    protected void compute() {
        //if work is above threshold, break tasks up into smaller tasks
          List<Task12> subtasks = new ArrayList<Task12>();
              subtasks.addAll(createSubtasks());
            for(RecursiveAction subtask : subtasks){
                subtask.fork();
            }
    }
    private List<Task12> createSubtasks() {
        List<Task12> subtasks =new ArrayList<Task12>();
     Task12 subtask1 = new Task12(this.Load / 2);
        subtasks.add(subtask1);
        return subtasks;
    }
}
public class JavaForkJoingetcommonpoolparallelismExample2 {
   public static void main(final String[] arguments) throws InterruptedException
      {      
      ForkJoinPool Pool = ForkJoinPool.commonPool();
      int i= Pool.getPoolSize();
      System.out.println("Common Pool Size before  :" +i);
       Task12 t = new Task12(1000);
       Pool.invoke(t);
       Pool.execute(t);
      System.out.println("Common Pool Size after  :" +Pool.getPoolSize());
        System.out.println(" Parallelism level of pool :" +Pool.getCommonPoolParallelism());
       System.out.println("Is pool use First-in-First-out Scheduling:" +Pool.getAsyncMode());
   }  
}

Test it Now

Output:

Common Pool Size after  :3
 Parallelism level of pool :3
Is pool use First-in-First-out Scheduling:false

Next TopicJava Forkjoinpool

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