Class SolverMultiClosedMoM

java.lang.Object

solvers.SolverMulti

solvers.SolverMultiClosedMoM

public class SolverMultiClosedMoM
extends SolverMulti

Solves a multiclass closed model with the exact MoM (Method of Moments) algorithm [Cas06][Cas11], one of the exact solution techniques available in JMVA for closed product form queueing networks.

This class implements the API to allow use by other applications. One can define the queueing network model details, call the solvers transparently and, afterwards, read the results.

Author:

Michail Makaronidis, 2010

Field Summary

Fields

Modifier and Type	Field	Description
protected int	nThreads	Number of threads that the MoMSolver should use
protected int[]	population	Array containing population for each class
protected QNModel	qnm	Contains the queueing network model
protected Integer	scale

Fields inherited from class SolverMulti

classes, CLOSED_CLASS, clsNumJobs, clsRespTime, clsThroughput, DELAY, HOL, LD, LI, name, OPEN_CLASS, priorities, PRS, pw, queueLen, residenceTime, scQueueLen, scResidTime, scThroughput, scUtilization, servers, servTime, stations, sysNumJobs, sysResponseTime, sysThroughput, throughput, type, utilization, visits

Constructor Summary

Constructors

Constructor	Description
SolverMultiClosedMoM(int classes, int stations, int[] population)	Creates new MoMSolverDispatcher

Method Summary

Modifier and Type	Method	Description
boolean	hasSufficientProcessingCapacity()	A system is said to have sufficient capacity to process a given load lambda if no service center is saturated as a result of the combined loads of all the classes.
boolean	input(int[] t, double[][][] s, double[][] v, int nThr)	Initializes the solver with the system parameters.
void	solve()	Solves the system through the MoM algorithm.

Methods inherited from class SolverMulti

getAggrQueueLen, getAggrQueueLen, getAggrResTime, getAggrResTime, getAggrThroughput, getAggrThroughput, getAggrUtilization, getAggrUtilization, getClsResTime, getClsResTime, getClsThroughput, getClsThroughput, getQueueLen, getQueueLen, getResTime, getResTime, getThroughput, getThroughput, getTotResTime, getTotThroughput, getUtilization, getUtilization, getVisits, input, input, printIndices, setServTime, toString

Methods inherited from class Object

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

Field Details

population

protected int[] population

Array containing population for each class

scale

protected Integer scale

qnm

protected QNModel qnm

Contains the queueing network model

nThreads

protected int nThreads

Number of threads that the MoMSolver should use

Constructor Details

SolverMultiClosedMoM

public SolverMultiClosedMoM(int classes,
 int stations,
 int[] population)

Creates new MoMSolverDispatcher

Parameters:

classes - number of classes

stations - number of service centers

population - array of class populations

Method Details

input

public boolean input(int[] t,
 double[][][] s,
 double[][] v,
 int nThr)

Initializes the solver with the system parameters. It must be called before trying to solve the model.

Parameters:

t - array of the types (LD or LI) of service centers

s - matrix of service times of the service centers

v - array of visits to the service centers

nThr - The number of threads the solver should use

Returns:

True if the operation is completed with success

solve

public void solve()

Solves the system through the MoM algorithm. input(...) must have been called first.

Specified by:

solve in class SolverMulti

hasSufficientProcessingCapacity

public boolean hasSufficientProcessingCapacity()

Description copied from class: SolverMulti

A system is said to have sufficient capacity to process a given load lambda if no service center is saturated as a result of the combined loads of all the classes.
Must be implemented to create a multi class model solver.
WARNING: This method should be called before solving the system.

Specified by:

hasSufficientProcessingCapacity in class SolverMulti

Returns:

true if sufficient capacity exists for the given workload, false otherwise