Tracing in JoBS is handled internally, by the scheduler.
Each JoBS queue can generate a
trace file containing the following information.
Each line of the tracefile consists of 17 columns. The first column is the
simulation time, columns 2 to 5 represent the loss rates over the current busy
period for classes 1 to 4, columns 6 to 9 represent the delays for each class
(average over a 0.5 seconds sliding window), columns 10 to 13 represent the
average service rates allocated to each class over the last 0.5 seconds, and
columns 14 to 17 represent the instantaneous queue length in packets.
Additionally, Demarkers can be used to trace end-to-end delays.