The Concurrent Prime Number Test uses the trial division algorithm to decide if a number is prime. The prime division algorithm is inefficient and we use it here only to test the EJS implementation of the Parallel Region Element in EJS. A parallel region executes independent code in threads that execute simultaneously on a multi-core processor. The screen capture shows that the total execution time for four computations on a quad-core processor is only one millisecond longer than the execution time for the longest single computation. This linear speedup is close to the theoretical maximum.

The Concurrent Prime Number Test Model was created using the Easy Java Simulations (EJS) modeling tool. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the model's jar file will run the simulation if Java is installed.

Please note that this resource requires
at least version 1.6 of
Java.

Sequential Prime Number Test Model
The Sequential Prime Number Test model uses the prime division algorithm to decide if a number is prime. The model records the computational time in… more... download 899kb .jar
Last Modified: October 11, 2013

Concurrent Prime Number Test Source Code
The source code zip archive contains an XML representation of the Parallel Region Prime Number Computation Model. Unzip this archive in your Ejs workspace to… more... download 37kb .zip
Last Modified: October 15, 2013
previous versions

Sequential Prime Number Test Source Code
The source code zip archive contains an XML representation of the Sequential Prime Number Test Model. Unzip this archive in your EJS workspace to compile and… more... download 20kb .zip
Last Modified: October 11, 2013

W. Christian, Computer Program CONCURRENT PRIME NUMBER TEST MODEL, Version 1.0 (2012), WWW Document, (http://www.compadre.org/Repository/document/ServeFile.cfm?ID=11669&DocID=2534).

W. Christian, Computer Program CONCURRENT PRIME NUMBER TEST MODEL, Version 1.0 (2012), <http://www.compadre.org/Repository/document/ServeFile.cfm?ID=11669&DocID=2534>.

Christian, W. (2012). Concurrent Prime Number Test Model (Version 1.0) [Computer software]. Retrieved October 31, 2014, from http://www.compadre.org/Repository/document/ServeFile.cfm?ID=11669&DocID=2534

Christian, Wolfgang. "Concurrent Prime Number Test Model." Version 1.0. http://www.compadre.org/Repository/document/ServeFile.cfm?ID=11669&DocID=2534 (accessed 31 October 2014).

%A Wolfgang Christian %T Concurrent Prime Number Test Model %D January 19, 2012 %U http://www.compadre.org/Repository/document/ServeFile.cfm?ID=11669&DocID=2534 %O 1.0 %O application/java

%0 Computer Program %A Christian, Wolfgang %D January 19, 2012 %T Concurrent Prime Number Test Model %7 1.0 %8 January 19, 2012 %U http://www.compadre.org/Repository/document/ServeFile.cfm?ID=11669&DocID=2534

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The Easy Java Simulations Modeling and Authoring Tool is needed to explore the computational model used in the Parallel Region Prime Number Computation Model.