Measuring Performance and Scalability
Thus far, I have defined the problem of performance and scalability in the context of Web applications, but I have not said much about their measurement. The measurement of performance and scalability is a weighty subject, and is different from the focus of this book. However, as you apply the various techniques that we cover here to your systems, you will want some simple measurements of the success of your efforts. In this section, we'll cover a few metrics that will tell you if your application is fast and scalable.
It's fairly easy to measure performance. We can use the application being tested or we can design an automatic benchmark and observe the original speed of the application ...