Figure 9-13 is the response-time graph based on the Statspack report used throughout this chapter and on which many of the preceding values and calculations are based (including the queuing theory calculations shown in this section). The actual graph was constructed by inputting the core statistics of sample interval timer, total workload units, total CPU consumption, number of CPU cores, and total non-idle wait time into OraPub's response-time graph template (a Microsoft Excel-based tool).7

Figure 9-13. Shown is the response-time graph created using OraPub's response-time graph template. This particular graph is based on the data shown in the calculations in this section. The peak arrival rate is clearly beyond what the system can process, and as we would expect, severe performance problems are occurring.

Notice the peak arrival rate is deep in the elbow of the curve. The system is so busy and the peak arrival rate intersects the response-time curve so high up that it dwarfs the service time. It shouldn't take much effort to convince your audience of this dire situation, preparing them to embrace your solutions about how to get out of the elbow of the curve.