TrafficSimulator

This is a JBang! script that generates shapes of TCP traffic to be received by Logstash. It's a not performance analisys tool, but just a loader. It sends rows, delimited by \n each wide average of mean_size.

Run

./TrafficSimulator.java --help

to list all the options, but in general are:

• --experiment defines the type of experiment and can be choosen by:
  • steps: generates 1 minute flow at max size, then 4 minutes at half, then 10 minutes half of the previous step. Then it terminates.
  • continuous: generates flow uninterrupted, until CTRL+C is pressed.
• -wait-distribution models the wait time between the sending of batch of messages (each batch contains 100 rows|messages) and the other, can be:
  • flat: wait constant time (20 ms) between each batch send
  • exponential: uses and exponential wait time based on the mean flow (5000 messages/sec) that we want to keep. It's a form of Poisson distribution of the wait times.
• mean-size: the mean size of a row, in terms of bytes|characters.

After have installed JBang on you host, you can run it, as an example:

./TrafficSimulator.java -p 3333 -e continuous -w exponential --mean-size 1024

Sends a continuous flow with exponential backoff where the mean size of each row is 1KB.

The continuous flow is organized to send

• 90% of the time row of mean-size +/- 5% of standard deviation.
• 1% creates a spike of 4 times the mean-size.
• 9% a 150% mean-size row.