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Why Do Performance Testing
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At the highest level, performance testing is almost always conducted to address one or more risks related to expense, opportunity costs, continuity, and/or corporate reputation. Some more specific reasons for conducting performance testing include: Assessing release readiness by: o Enabling you to predict or estimate the performance characteristics of an application in production and evaluate whether or not to address performance concerns based on those predictions. These predictions are also valuable to the stakeholders who make decisions about whether an application is ready for release or capable of handling future growth, or whether it requires a performance improvement/hardware upgrade prior to release. o Providing data indicating the likelihood of user dissatisfaction with the performance characteristics of the system. o Providing data to aid in the prediction of revenue losses or damaged brand credibility due to scalability or stability issues, or due to users being dissatisfied with application response time. Assessing infrastructure adequacy by: o Evaluating the adequacy of current capacity. o Determining the acceptability of stability.
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o Determining the capacity of the application s infrastructure, as well as determining the future resources required to deliver acceptable application performance. o Comparing different system configurations to determine which works best for both the application and the business. o Verifying that the application exhibits the desired performance characteristics, within budgeted resource utilization constraints. Assessing adequacy of developed software performance by: o Determining the application s desired performance characteristics before and after changes to the software. o Providing comparisons between the application s current and desired performance characteristics. Improving the efficiency of performance tuning by: o Analyzing the behavior of the application at various load levels. o Identifying bottlenecks in the application. o Providing information related to the speed, scalability, and stability of a product prior to production release, thus enabling you to make informed decisions about whether and when to tune the system.
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For a performance testing project to be successful, both the approach to testing performance and the testing itself must be relevant to the context of the project. Without an understanding of the project context, performance testing is bound to focus on only those items that the performance tester or test team assumes to be important, as opposed to those that truly are important, frequently leading to wasted time, frustration, and conflicts. The project context is nothing more than those things that are, or may become, relevant to achieving project success. This may include, but is not limited to: The overall vision or intent of the project Performance testing objectives Performance success criteria The development life cycle The project schedule The project budget Available tools and environments The skill set of the performance tester and the team The priority of detected performance concerns The business impact of deploying an application that performs poorly Some examples of items that may be relevant to the performance-testing effort in your project context include: Project vision. Before beginning performance testing, ensure that you understand the current project vision. The project vision is the foundation for determining what
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performance testing is necessary and valuable. Revisit the vision regularly, as it has the potential to change as well. Purpose of the system. Understand the purpose of the application or system you are testing. This will help you identify the highest-priority performance characteristics on which you should focus your testing. You will need to know the system s intent, the actual hardware and software architecture deployed, and the characteristics of the typical end user. Customer or user expectations. Keep customer or user expectations in mind when planning performance testing. Remember that customer or user satisfaction is based on expectations, not simply compliance with explicitly stated requirements. Business drivers. Understand the business drivers such as business needs or opportunities that are constrained to some degree by budget, schedule, and/or resources. It is important to meet your business requirements on time and within the available budget. Reasons for testing performance. Understand the reasons for conducting performance testing very early in the project. Failing to do so might lead to ineffective performance testing. These reasons often go beyond a list of performance acceptance criteria and are bound to change or shift priority as the project progresses, so revisit them regularly as you and your team learn more about the application, its performance, and the customer or user. Value that performance testing brings to the project. Understand the value that performance testing is expected to bring to the project by translating the project- and business-level objectives into specific, identifiable, and manageable performance testing activities. Coordinate and prioritize these activities to determine which performance testing activities are likely to add value. Project management and staffing. Understand the team s organization, operation, and communication techniques in order to conduct performance testing effectively. Process. Understand your team s process and interpret how that process applies to performance testing. If the team s process documentation does not address performance testing directly, extrapolate the document to include performance testing to the best of your ability, and then get the revised document approved by the project manager and/or process engineer. Compliance criteria. Understand the regulatory requirements related to your project. Obtain compliance documents to ensure that you have the specific language and context of any statement related to testing, as this information is critical to determining compliance tests and ensuring a compliant product. Also understand that the nature of performance testing makes it virtually impossible to follow the same processes that have been developed for functional testing. Project schedule. Be aware of the project start and end dates, the hardware and environment availability dates, the flow of builds and releases, and any checkpoints and milestones in the project schedule.
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