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.

The previous example was based on a two-CPU core system experiencing a raging CPU bottleneck. Here, we will walk through the same process, but with a larger system experiencing a classic multiblock IO read bottleneck.