Parallel Programming with ForkJoinPool Tasks in Java

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Presentation transcript:

Parallel Programming with ForkJoinPool Tasks in Java

Parallel Programming with Java ForkJoinPool An Overview of the Presentation What is Parallel Programming? How to Implement Parallel Processing? An Overview of Java ForkJoinPool The ForkJoinPool Structure & Functionality Steps in Implementing a Java Program with the ForkJoinPool A Sample Java Program with the ForkJoinPool Utilization Thank You

Parallel Programming with Java ForkJoinPool Parallel programming is a process of running multiple tasks on multiple processors.

How to Implement Parallel Processing? Parallel Programming with Java ForkJoinPool How to Implement Parallel Processing? 1) Thread Pool in Java Since Java Version 1.0 A thread pool is a collection of worker threads that efficiently execute asynchronous callbacks on behalf of the application. Used to reduce the number of application threads; Provides management of the worker threads. 2) ExecutorService in Java Since Java Version 1.5 Is an asynchronous execution mechanism that is capable of executing tasks in the background. It is a thread pool implementation.

An Overview of Java ForkJoinPool Parallel Programming with Java ForkJoinPool An Overview of Java ForkJoinPool 3) ForkJoinPool in Java Since Java Version 1.7 The ForkJoinPool is similar to the Java ExecutorService but with one difference that it easily split the working task into smaller tasks which are then submitted to the ForkJoinPool; and finally joins the results (if any).

Parallel Programming with Java ForkJoinPool

An Overview of Java ForkJoinPool Parallel Programming with Java ForkJoinPool An Overview of Java ForkJoinPool Uses Divide & Conquer Fashion:

An Overview of Java ForkJoinPool Parallel Programming with Java ForkJoinPool An Overview of Java ForkJoinPool

An Overview of Java ForkJoinPool Parallel Programming with Java ForkJoinPool An Overview of Java ForkJoinPool

The ForkJoinPool Structure & Functionality Parallel Programming with Java ForkJoinPool The ForkJoinPool Structure & Functionality

A Java program using ForkJoinPool Parallel Programming with Java ForkJoinPool A Java program using ForkJoinPool Fibonacci(n) Calculation:

Steps in Implementing a Java Program with the ForkJoinPool Parallel Programming with Java ForkJoinPool Steps in Implementing a Java Program with the ForkJoinPool 1) Creating a ForkJoinPool Object ForkJoinPool fjpool = new ForkJoinPool(); 2) Submitting Tasks to the ForkJoinPool Object fjpool.invoke(task) RecursiveAction: A task which does not return any value. It just does some work, e.g. writing data to disk, and then exits. RecursiveTask: A task that returns a result. It may split its work up into smaller tasks, and merge the result of these smaller tasks into a collective result.

A Sample Java Program with the ForkJoinPool Utilization Parallel Programming with Java ForkJoinPool A Sample Java Program with the ForkJoinPool Utilization

Parallel Programming with Java ForkJoinPool A Sample Java Program with the ForkJoinPool Utilization Sample Output:

Parallel Programming with Java ForkJoinPool References: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ForkJoinPool.html https://homes.cs.washington.edu/~djg/teachingMaterials/spac/grossmanSPAC_forkJoinFramework.html http://tutorials.jenkov.com/java-util-concurrent/java-fork-and-join-forkjoinpool.html https://www.youtube.com/watch?v=5wgZYyvIVJk https://github.com/headius/forkjoin.rb/blob/master/examples/recursive/Fibonacci.java

Thank you! Thank you!