OPNET Modeler M/M/1 Queue

(Compiled from OPNET Modeler M/M/1 Tutorial)

Hue Tran

Spring 2002

Version 1.0

src queue sink

Read the OPNET tutorial on OPNET Modeler of M/M/1 queue system from the help file carefully.

Getting started:

Create project and scenario

• Lclick File
• Project: new
• Scenario: new
• Project name: your_initial_mm1net
• Scenario: mm1. è Start Up Wizard window opens
• Select Quit for Startup Wizard è Project Editor window opens

Node Editor:

Create Node model:

• Lclick File
• Lclick New
• Lclick Node model
• Lclick OK è To Open Node Editor window

Investigate and familiar with the name of each icon on the Node Editor.

Create Processor Module:

• Lclick and drag the Create Processor icon to the Node Editor workspace.
• Rclick to end.
• Lclick on the Processor module to open Process Model window (Finite State Machine level)
• Investigate the state diagram.
• Close the window.

Set processor module’s attributes:

• Rclick on the Processor module
• Select Edit Attributes è To Open Attributes dialog window
• Name: src
• Process model: simple_source
• Lclick Value column of Packet Interarrival Time è To open Packet Interarrival Time Specification dialog window.
• Distribution name: Exponential
• Mean Outcome: 1.0
• Lclick OK è To Close Packet Interarrival Time Specification dialog window.
• Lclick on Value column of Packet Size è Open Packet Size Specification dialog window.
• Distribution name: Exponential
• Mean Outcome: 9000
• Lclick OK è To Close Packet Size Specification dialog window.
• Lclick OK è To Close Attributes dialog window.

Create Queue Module:

• Lclick and drag the Queue icon to the Node Editor workspace.
• Rclick to end.

Set queue module’s attributes:

• Rclick on Queue module
• Select Edit Attributes è To Open Attributes dialog window
• Name: queue
• Process model: Select acb_fifo
• Service_rate: 9600.
• Lclick OK èTo Close Attributes dialog window

Create Processor Module (Add a sink module to destroy a temporary entity):

• Lclick and drag the Create Processor module to the Node Editor workspace.
• Rclick to end.

Processor module’s attributes:

• Rclick on Processor module
• Edit Attributes è Open Attributes dialog window
• Name: sink
• Lclick OK è To Close Attributes dialog window.

Create packet stream (modules connection)

• Lclick on Create Packet Stream icon.
• Lclick on src module then lclick on queue è connect src module to queue module
• Lclick on queue module then lclick on sink module
• Rclick to end.

The model is now completed

Save the model:

• Lclick File
• Lclick Save è Name: your_initial_mm1
• Lclick Ok è To Close Node Editor.
• Get a print of the model.

The model is now available to be used in a network.

Create network model:

For this example, the network will consist of a single node object based on the M/M/1 model created above. This is achieved by first creating a new object palette.

Create a new object palette

• Lclick Open Object palette
• LClick Configure Palette è To open Configure Palette window

Activate Model List

• Lclick Clear
• Lclick Node Models è To open list of available node models
• Find your_initial_mm1 node model created earlier.
• Lclick on Status column to include the node model
• Lclick OK è To Close the list
• Lclick Save è name: your_initial_mm1_palette
• Lclick OK è To save
• Lclick OK è To close Configure Palette window

Create network model

• Lclick and drag your_initial_mm1 node model from object palette to workplace.
• Rclick to end
• Rclick on the node è To open Object window
• Name: m1
• Lclick OK è To close Object window.
• Lclick File
• Lclick Save (the name should be your_initial_mm1net)
• Lclick OK è To save the network

Statistics Collection using Probe Editor

To provide statistics to be collected during simulation and for report generation after simulation.

• Lclick File
• Lclick New
• Select Probe Model
• Lclick OK è To open Probe Editor window

Set network model

• Click Objects on menu
• Select Set Network Model è To open network model window
• Select your_initial_mm1net-mm1 network model from network model window.

Set probes

• Lclick Create Node Statistic Probe è a probe appears below Node Statistic Probe
• Rclick on the probe
• Select Choose Probed Object
• Lclick on the arrow next to m1 node to show its components
• Lclick queue module in a node diagram
• Lclick OK è To close dialog window
• Rclick on probe
• Select Edit Attributes è To open Attributes window
• Name: queue delay
• Submodule: subqueue[0]
• Lclick in the Value column of statistic row è To open Available Statistics dialog window.
• Select queue.queueing delay
• Lclick OK to apply
• Lclick OK è To close Attributes window.
• Lclick Create Node Statistic Probe
• Rclick on new probe
• Select Edit Attributes è To open Attributes window
• Name: queue size
• Subnet: top
• Node: m1
• Module: queue
• Submodule: subqueue[0]
• Group: queue
• Statistic: queue size (packets)
• Lclicl OK è To close Attribute dialog window
• Lclick File
• Lclick Save è name: your_initial_mm1probe

At this point, modeling process is finished.

The model has been created completely

Data to be collected for analysis have been specified.

The next step is simulation.

Simulation

· Lclick Simulation on menu of Project Editor è To open simulation menu

• Lclick Configure Simulation (Advanced) è To open Simulation Tools
• Rclick on the Scenario
• Select Edit Attributes
• Probe File: your_initial_mm1probe
• Seed: 431
• Duration: 7 hours
• Lclick OK
• Lclick Execute Simulation Sequence to begin simulation session.

Wait until the simulation finish.

Analysis Tools

View average queueing delay

• Lclick File
• Lclick Open
• Select Analysis Configuration
• Select your_initial_mm1net-mm1
• Lclick OK è To open Analysis Tool window
• Lclick Create A Graph Of A Statistic è To open View Results dialog window
• Lclick File Statistics
• Lclick your_initial_mm1net-mm1
• Lclick Object Statistics
• Lclick m1
• Lclick queue
• Lclick subqueue[0]
• Lclick queue
• Lclick queueing delay è To enable the statistic
• Lclick average
• Lclick Show è the graph of average queueing delay appears.

View time-averaged queue size

Do not close the graph window of queueing delay

• Lclick queueing delay è To disable the statistic
• Lclick queue size (packets) è To enable the statistic
• Select Time-average
• Lclick Show è the graph of time-averaged queue size appears

View queue size versus time-averaged queue size

• Close view results window

• Rclick on the graph of time-averaged queue size
• Select Add Statistic è To open new view result window
• Lclick File Statistics
• Lclick your_initial_mm1net-mm1
• Lclick Object Statistics
• Lclick m1
• Lclick queue
• Lclick subqueue[0]
• Lclick queue
• Lclick queue size(packets)
• Lclick Add è To add the graph of queue size (packets)
• Get hard copies of the model and all graphs