Parallel programming in Java

Question

How can we do Parallel Programming in Java? Is there any special framework for that? How can we make the stuff work?

I will tell you guys what I need, think that I devel

Answer 1

You can have a look at Hadoop and Hadoop Wiki.This is an apache framework inspired by google's map-reduce.It enables you to do distributed computing using multiple systems.Many companies like Yahoo,Twitter use it(Sites Powered By Hadoop).Check this book for more information on how to use it Hadoop Book.

Answer 2

You might try Parallel Java 2 Library.

On the website Prof. Alan Kaminsky wrote:

Fast forward to 2013, when I started developing PJ2. Parallel computing had expanded far beyond what it was a decade earlier. Multicore parallel computers were equipped with many more CPU cores and much larger main memory, such that computations that used to require a whole cluster now could be done on a single multicore node. New kinds of parallel computing hardware had become commonplace, notably graphics processing unit (GPU) accelerators. Cloud computing services, such as Amazon's EC2, allowed anyone to run parallel programs on a virtual supercomputer with thousands of cores. New application areas for parallel computing had opened up, notably big data analytics. New parallel programming APIs had arisen, such as OpenCL and NVIDIA Corporation's CUDA for GPU parallel programming, and map-reduce frameworks like Apache's Hadoop for big data computing. To explore and take advantage of all these trends, I decided that a completely new Parallel Java 2 Library was needed.

In early 2013 when PJ2 wasn't yet available (although an earlier version was), I tried Java Parallel Processing Framework (JPPF). JPPF was okay but at first glance PJ2 looks interesting.

Answer 3

Java supports threads, thus you can have multi threaded Java application. I strongly recommend the Concurrent Programming in Java: Design Principles and Patterns book for that:

http://java.sun.com/docs/books/cp/

Answer 4

Read the section ón threads in the java tutorial. http://download-llnw.oracle.com/javase/tutorial/essential/concurrency/procthread.html

Answer 5

you can use JCSP (http://www.cs.kent.ac.uk/projects/ofa/jcsp/) the library implements CSP (Communicating Sequential Processes) principles in Java, parallelisation is abstracted from thread level and you deal instead with processes.

Answer 6

As far as I know, on most operating systems the Threading mechanism of Java should be based on real kernel threads. This is good from the parallel programming prospective. Other languages like Python simply do some time multiplexing of the processor (namely, if you run a heavvy multithreaded application on a multiprocessor machine you'll see only one processor running).

You can easily find something just googling it: by example this is the first result for "java threading": http://download-llnw.oracle.com/javase/tutorial/essential/concurrency/

Basically it boils down to extend the Thread class, overload the "run" method with the code belonging to the other thread and call the "start" method on an instance of the class you extended.

Also if you need to make something thread safe, have a look to the synchronized methods.