228 CHAPTER 9 PERFORMANCE AND SCALABILITY TESTING (Web hosting isp)
228 CHAPTER 9 PERFORMANCE AND SCALABILITY TESTING Figure 9-1. A graduated load test Figure 9-2. A loaded enterprise application follows this typical pattern. As the number of users (load) increases, the system utilization naturally increases, because you need more resources to do more work. Likewise the throughput increases, because as you are sending more work to the application, it is performing more work. When the load becomes too heavy for the environment to support, then resources become saturated, which manifests in excessive CPU context switching, garbage collections, disk I/O, network activity, and so on.
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