written by Wolfgang Christian

The two-dimensional Ising Spatial Decomposition model solves the Ising model on a parallel computer by partitioning the spin lattice into rectangular subsystems of approximately equal size and assigning an independent computational thread to each subsystem. Because a lattice site only interacts with its nearest neighbors, sites in the interior of a subsystem only interact with sites in the same subsystem and the solution algorithm can be applied without interference between threads.  Border cells, however, can interact with cells in neighboring subsystems and this interaction must be synchronized.  
 
This model uses a parallel region to perform the computation.  A second window displays a histogram showing how may spin flips are performed by each thread.

The Ising 2D Spatial Decomposition Model was developed using the Easy Java Simulations (Ejs) modeling tool.  It is distributed as a ready-to-run (compiled) Java archive.  Double clicking the jar file will run the program if Java is installed.

• Download ejs_model_Ising2DSpatialDecomposition.jar - 1753kb Java Archive File

Published October 14, 2013
Last Modified October 18, 2017

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A step-by-step introduction to parallel programming in Java using EJS.

• Download Parallel Programming with EJS Tutorial.pdf - 2083kb Adobe PDF Document

Last Modified December 22, 2017

This file is included in the full-text index.

The source code zip archive contains an XML representation of the Ising 2D Spatial Decomposition Model.   Unzip this archive in your EJS workspace to compile and run this model using EJS.

• Download ejs_src_Ising2DSpatialDecomposition.zip - 233kb Compressed File

Last Modified October 18, 2017

This file has previous versions.