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The key to determining the objectives of a performance-testing effort is to identify change, potential risks, and opportunities for improvement. One way to determine and record performance-testing objectives is simply to ask each member of the project team what value you can add or risk you can mitigate for him or her while you are conducting performance testing at a particular point in the project, or immediately following the accomplishment of a particular milestone. Such objectives might include providing data on resource utilization under load, generating specific loads to assist with tuning an application server, or providing a report of the number of objects requested by each Web page. Although it is most valuable to start collecting performance-testing objectives early in the project life cycle, it is also important to periodically revisit these objectives and ask team members if they would like to see any new objectives added. Keep in mind the following high-level considerations when determining performancetesting objectives: Performance-testing objectives represent the starting point of performance validation and verification activities. Performance-testing objectives start with the business entry points: business volume, future growth, and so on. With this information, you can articulate technological objectives mapping to the entry points. Performance-testing objectives correlate to business needs and therefore should represent real-world business scenarios involving real customers. After you have determined the high-level objectives, you can refine the objectives to map more specifically to the technology.
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Use this chapter to understand how to establish performance-testing objectives in a collaborative manner in order to provide the greatest value to the team. To get the most from this chapter:
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Use the Terminology section to understand some common terms related to performance-testing objectives so that you can articulate these terms correctly in the context of your project. Use the Approach for Determining Performance-Testing Objectives section to get an overview of the approach, and as a quick reference guide for you and your team. Use the remaining sections to gain a more detailed understanding of identifying and capturing performance-testing objectives, capturing or estimating resource usage targets and thresholds, and capturing or estimating resource budgets or allocations. Use the Case Studies section to walk through real-life examples of identifying performance-testing objectives.
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Terminology
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This chapter uses the following terms. Term / Concept Performance-testing objectives Description Performance-testing objectives refer to data collected through the process of performance testing that is anticipated to have value in determining or improving the quality of the product. However, these objectives are not necessarily quantitative or directly related to a performance requirement, goal, or stated quality of service (QoS) specification. Performance objectives are usually specified in terms of response times, throughput (transactions per second), and resource-utilization levels and typically focus on metrics that can be directly related to user satisfaction. Performance targets are the desired values for the metrics identified for your project under a particular set of conditions, usually specified in terms of response time, throughput, and resource-utilization levels. Resource-utilization levels include the amount of processor capacity, memory, disk input/output (I/O), and network I/O that your application consumes. Performance targets typically equate to project goals. Performance thresholds are the maximum acceptable values for the metrics identified for your project, usually specified in terms of response time, throughput (transactions per second), and resource-utilization levels. Resource-utilization levels include the amount of processor capacity, memory, disk I/O, and network I/O that your application consumes. Performance thresholds typically equate to requirements. Performance budgets (sometimes known as performance allocations) are constraints placed on developers regarding allowable resource consumption for their component.
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Performance objectives
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Performance budgets
Approach for Determining Performance Testing Objectives
Determining performance-testing objectives can be thought of in terms of the following activities: Determine the objectives of the performance-testing effort. Capture or estimate resource usage targets and thresholds. Capture or estimate resource budgets or allocations. Identify metrics. Communicate results. Stay aware of changing objectives, targets, and budgets. These activities have been discussed in detail in the following sections.
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