jenes.utils.multitasking

Class MultiThreadRunner

java.lang.Object

jenes.utils.multitasking.Runner

jenes.utils.multitasking.MultiThreadRunner

Direct Known Subclasses:

MultiThreadEvaluator

public abstract class MultiThreadRunner
extends Runner

This class provide the basic implementation of a multi-thread enviroinment for GeneticAlgorithm

Since:

2.0

Field Summary

Fields

Modifier and Type	Field and Description
protected int	nthreads
protected java.util.concurrent.ExecutorService	threadGroup Instance of the thread pool

Fields inherited from class jenes.utils.multitasking.Runner

algorithm

Constructor Summary

Constructors

Constructor and Description
MultiThreadRunner() Default constructor.
MultiThreadRunner(int nthreads) This will instantiate a MultiThreadRunner enviroinment with a fixed thread pool sized as defined by argument

Method Summary

Methods

Modifier and Type	Method and Description
int	getNthreads() Get the number of threads currently setted for this enviroinment
void	start(boolean reset) Call-back invoked by GeneticAlgorithm.start(boolean)
void	stop() Call-back called soon after GeneticAlgorithm.onStop(long)

Methods inherited from class jenes.utils.multitasking.Runner

evaluateIndividual, execute, execute, execute, getGeneticAlgorithm, onEvaluationBegin, onEvaluationEnd, onInit, setAlgorithm

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

nthreads

protected int nthreads

threadGroup

protected java.util.concurrent.ExecutorService threadGroup

Instance of the thread pool

Constructor Detail

MultiThreadRunner

public MultiThreadRunner()

Default constructor. This will instantiate a MultiThreadRunner envoiroinment wich thread number is equals to the maximum number of processor phisical avaible to the host Java Virtual Machine.
This approach minimize the overhead in managing the thread because the latest JVMs could try to dispach each thread on a different phisical processor obtaining the best speed-up in performances.

See Also:

MultiThreadRunner(int), Runtime.availableProcessors()

MultiThreadRunner

public MultiThreadRunner(int nthreads)

This will instantiate a MultiThreadRunner enviroinment with a fixed thread pool sized as defined by argument

Parameters:

nthreads - the number of threads to use to parallelize algorithm execution

Method Detail

getNthreads

public int getNthreads()

Get the number of threads currently setted for this enviroinment

Returns:

start

public void start(boolean reset)

Description copied from class: Runner

Call-back invoked by GeneticAlgorithm.start(boolean)

Overrides:

start in class Runner

stop

public void stop()

Description copied from class: Runner

Call-back called soon after GeneticAlgorithm.onStop(long)

Overrides:

stop in class Runner