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Usually, technical performance characteristics only indirectly relate to the other categories of requirements. These characteristics frequently concern the use of particular technologies, and usually consist of targets and thresholds that are specific metrics related to particular resources. For example, it is generally agreed that once a server s processor utilization reaches 80 percent, user requests will start to significantly queue, and therefore users will experience poor service even though the server might still be running fine. Based on this, many teams will set a processor utilization target of 70 percent and a threshold of 80 percent. By doing so, they are telling the performance tester to alert the team if he or she observes readings of more than 70-percent processor utilization sustained for more than a few seconds, and to register a defect if a processor utilization rate of more than 80 percent is observed for more than a few seconds under the target workloads. Capturing and managing technical performance-testing requirements generally requires that you: Determine objectives of performance testing. This activity ensures that technical requirements are prioritized appropriately for the performance concerns of the project. Capture or estimate resource usage targets and thresholds. These may come from architects, administrators, design documents, or hardware/software technical documentation. Capture or estimate resource budgets or allocations. Typically assigned to developers by architects and administrators, these represent the amount of a specific resource a particular component may use so that the system as a whole will not violate its targets or thresholds. Identify metrics. There is often more than one way to measure resource consumption. The team must agree on the specific method and metric for each technical requirement to enable communication and understanding. Communicate results. Collected data that relates to technical requirements is valuable to various members of the team in different forms as soon as it is available. Sharing the data immediately assists with design, tuning, and identifying requirements that may need to be revisited. Keep abreast of changing objectives, targets, and budgets. Just like other types of requirements, technical requirements are bound to change during the course of the project. Expect this and keep up with the changes.
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Research Standards, Compliance, and Contracts
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The performance characteristics in this category are frequently the least negotiable, whether or not they have a significant impact on end-user satisfaction, budget, schedule, or technology. Determining performance requirements in this category generally involves the following tasks: Obtaining documents and standards that spell out legally enforceable performance requirements.
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Interpreting those legally enforceable performance requirements within the context of your project. Determining if any de facto standards or competitive comparisons apply to your project. If so, collect the relevant data. Getting stakeholder approval for the interpretations. Because the company or even individual stakeholders could be held legally liable if the application does not meet the requirements, this is a situation where stakeholder approval is highly recommended.
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Establish Performance-Testing Objectives
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Determining performance-testing objectives can be fairly easy. The challenge is that the performance tester does not always have easy access to either explicit or implied objectives, and therefore frequently must conduct a systematic search for these objectives. Determining performance-testing objectives generally involves the following tasks: Determining the overall objectives for the performance testing effort, such as: o Detect bottlenecks that need tuning. o Assist the development team in determining the performance characteristics for various configuration options. o Provide input data for scalability and capacity-planning efforts. Reviewing the project plan with individual team members or small groups. Ask questions such as: o What functionality, architecture, and/or hardware will be changing between the last iteration and this iteration o Is tuning likely to be required as a result of this change Are there any metrics that I can collect to help you with the tuning o Is this change likely to impact other areas for which we have previously tested/collected metrics Reviewing both the physical and logical architecture with individual team members or small groups. As you review the architecture, ask questions such as: o Have you ever done this/used this before o How can we determine early in the process if this is performing within acceptable parameters o Is this likely to need tuning What tests can I run or what metrics can I collect to assist in making this determination Asking individual team members about their biggest performance-related concern(s) for the project and how you could detect those problems as early as possible. While it is most valuable to collect 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.
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