Performance by Design: Computer Capacity Planning by Example

Chapter 9. Case Study V: A Help-Desk Service

Introduction

Several examples are presented in previous chapters to predict performance when changes occur in an existing system, either with respect to its workload or with respect to its hardware/software platform. Performance engineering involves building performance models for existing workloads and predicting the effects of possible upgrades. Measurements taken on existing workloads are used to obtain the service demands required by performance models, as indicated in Fig. 9.1.

Figure 9.1. Capacity planning for existing workloads.

However, in many performance engineering situations, one is confronted ...