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Run the experiment

Ready to run the experiment? First turn the nodes on, since they'll still be off after being imaged:

omf tell -a on -t node1-5.sb4.orbit-lab.org,node1-6.sb4.orbit-lab.org,node1-9.sb4.orbit-lab.org

Then run:

omf exec wmxtutor-streamload.rb

Make a note of your experiment ID, which is printed on the console like this:

INFO NodeHandler: Experiment ID: default_slice-2013-07-17t19.19.57.782-04.00

Once the experiment has concluded, note its Experiment ID push the results to a "streamload" directory in iRODS using this ID:

iarchive -e expID -c streamload

(replace expID with your actual Experiment ID as printed on the console)

To view your experiment results, visit the iRODS web browser at ​http://witestlab.poly.edu/irods/web. Use:

• Host: emmy9.casa.umass.edu
• Port: 1247
• Zone: geniRenci

Click on the expID.sq3 file and click 'Plot' to create simple plots of measurements stored by OML. Try creating the following plots:

• Plot table 'streamload_play' with 'chunk' on the x-axis, 'layer' on the y-axis, and group by 'oml_sender_id'. This will show you the number of layers downloaded for each of the 40 video segments, for each client.
• Plot table 'wmxstat_status' with 'oml_seq' on the x-axis, 'cinr' on the y-axis, and group by 'oml_sender_id'. This will show you the WiMAX link quality as measured at each node for the duration of the experiment.

The results may look something like this:

WiMAX link status

Layers played, per segment

You can also download this file and explore the data using an SQLite browser such as ​this Firefox plugin.

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