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2. Instrument your Application using LabWiki

In this part you will learn how you can use LabWiki to execute an experiment on the slice you reserved in the previous step.

2.1 Design and Execute measurement in LabWiki

2.1.1. The "Plan" Window

To get started point your browser to Labwiki has three major windows. We will focus on the leftmost window first. This is the "Planning" window in which you document your experiment. (This is somewhat the equivalent of an electronic lab journal.) Documents are written in Markdown.

At the top of that window is a text field which you can use to search for existing MD scripts. Type "learningswitch" in the field and then select "" from the list of files that are offered. This document has some information on the experiment that will be performed in the tutorial.

2.1.2 The "Prepare" Window

In the Search bar in the prepare window, find the script firegenipart1.oedl and click on it to load it. Note: Create a new script by clicking on the wheel and prepend your username to the name of the script. Copy and paste the contents of firegenipart1.oedl to create a copy of your own.
Please do not modify the original script.

The script is also shown here for your reference:

defProperty('source1', "nodea-exttest7", "ID of a resource")
defProperty('source2', "switch1-exttest7", "ID of a resource")
defProperty('source3', "switch2-exttest7", "ID of a resource")

defProperty('sinkaddr12', '', "Ping destination address")
defProperty('sinkaddr13', '', "Ping destination address")

defProperty('sinkaddr21', '', "Ping destination address")
defProperty('sinkaddr23', '', "Ping destination address")
defProperty('sinkaddr24', '', "Ping destination address")

defApplication('ping') do |app|
  app.description = 'Simple Definition for the ping-oml2 application'
  # Define the path to the binary executable for this application
  app.binary_path = '/usr/local/bin/ping-oml2'
  # Define the configurable parameters for this application
  # For example if target is set to and count is set to 2, then the 
  # application will be started with the command line:
  # /usr/bin/ping-oml2 -a -c 2
  app.defProperty('target', 'Address to ping', '-a', {:type => :string})
  app.defProperty('count', 'Number of times to ping', '-c', {:type => :integer})
  # Define the OML2 measurement point that this application provides.
  # Here we have only one measurement point (MP) named 'ping'. Each measurement
  # sample from this MP will be composed of a 4-tuples (addr,ttl,rtt,rtt_unit)
  app.defMeasurement('ping') do |m|

defApplication('trema') do |app|
  app.description = 'This app runs trema from command line'
  app.binary_path = '/bin/sh /root/'
defGroup('Source2', property.source2, property.source3) do |node|
defGroup('Source1', property.source1) do |node|
  node.addApplication("ping") do |app|
    app.setProperty('target', property.sinkaddr12)
    app.setProperty('count', 30)
    #app.setProperty('interval', 1)
    app.measure('ping', :samples => 1)
  node.addApplication("ping") do |app|
    app.setProperty('target', property.sinkaddr13)
    app.setProperty('count', 30)
    #app.setProperty('interval', 1)
    app.measure('ping', :samples => 1)
   node.addApplication("ping") do |app|
    app.setProperty('target', property.sinkaddr21)
    app.setProperty('count', 30)
    #app.setProperty('interval', 1)
    app.measure('ping', :samples => 1)
   node.addApplication("ping") do |app|
    app.setProperty('target', property.sinkaddr23)
    app.setProperty('count', 30)
    #app.setProperty('interval', 1)
    app.measure('ping', :samples => 1)
  node.addApplication("ping") do |app|
    app.setProperty('target', property.sinkaddr24)
    app.setProperty('count', 30)
    #app.setProperty('interval', 1)
    app.measure('ping', :samples => 1)

onEvent(:ALL_UP_AND_INSTALLED) do |event|
  info "Starting the ping"
  after 2 do
  after 20 do
  after 80 do
    info "Stopping the ping"

defGraph 'RTT' do |g|'ping').select(:oml_seq, :dest_addr, :rtt) 
  g.caption "RTT of received packets."
  g.type 'line_chart3'
  g.mapping :x_axis => :oml_seq, :y_axis => :rtt, :group_by => :dest_addr
  g.xaxis :legend => 'oml_seq'
  g.yaxis :legend => 'rtt', :ticks => {:format => 's'}

2.1.3 Start your application from LabWiki

To start your experiment, simply drag the icon that is to the left of the file name (see figure below) from the middle (Prepare) to the right (Execute) window. Explanation of the fields in the Execute window:

  • name: In this field you specify the name of your experiment.
  • slice: Type the name of the slice you would like to run your experiment on

*Change source1, source2 and source3 fields to include your slice name similar to nodea-<slicename>

Then, start the actual experiment by clicking on the "Start Experiment" button.

3.1.4 During experiment execution

After pressing the "Start" button, the Execute window will change and start showing status information about your experiment. The figure below gives an example for the Execute window during experiment execution.

Now the window lists experiment properties, one or several live graphs (if they have been specified in the OEDL script), and logging information. The latter would be a good starting point for trouble shooting, should your experiment not run as expected.

Depending on the status of your resources and experiments, you will see one of the following statuses at the top of the Execute window:

  • Pending - This is the first state of your experiment where the job scheduler adds it to the run queue. This status would remain for the first few seconds before it changes to Running or Failed
  • Running - This status appears when your experiment starts running. If it fails for one or more reasons, a Failed status will appear instead
  • Aborted - When you click on "Stop Experiment" at the top-left corner of the Execute window, the status changes to aborted
  • Finished - When your experiment is done, you will see this status


Next: Finish

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