- The data is in the form of sampled time series. Instead of throughput X(N) as a function of N users, the data is in the form X(t) and N(t) as functions of time t.
- The data is multi-valued. Within each sample period there were multiple user loads with the same value but different throughput values. For example:
Hr X(t) N(t) 7 12 1 7 12 1 8 166 22 8 462 69 8 680 149 9 282 45 9 310 55 9 291 55
Wednesday, August 27, 2008
Applying the USL Model to Multivalued Data
A reader was having trouble applying the USL model to his data and asked me to take a look at it. I can't discuss his data because it's private, but I can show you what I did using some simulated data that has the same properties. The data was collected off a production system not a controlled load-test platform, and this brought to the surface two aspects of applying the USL which I had not faced previously: