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The following definitions are used throughout this guide. Every effort has been made to ensure that these terms and definitions are consistent with formal use and industry standards; however, some of these terms are known to have certain valid alternate definitions and implications in specific industries and organizations. Keep in mind that these definitions are intended to aid communication and are not an attempt to create a universal standard. Term / Concept Capacity Description The capacity of a system is the total workload it can handle without violating predetermined key performance acceptance criteria. A capacity test complements load testing by determining your server s ultimate failure point, whereas load testing monitors results at various levels of load and traffic patterns. You perform capacity testing in conjunction with capacity planning, which you use to plan for future growth, such as an increased user base or increased volume of data. For example, to accommodate future loads, you need to know how many additional resources (such as processor capacity, memory usage, disk capacity, or
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network bandwidth) are necessary to support future usage levels. Capacity testing helps you to identify a scaling strategy in order to determine whether you should scale up or scale out. Component test A component test is any performance test that targets an architectural component of the application. Commonly tested components include servers, databases, networks, firewalls, and storage devices. An endurance test is a type of performance test focused on determining or validating performance characteristics of the product under test when subjected to workload models and load volumes anticipated during production operations over an extended period of time. Endurance testing is a subset of load testing. Investigation is an activity based on collecting information related to the speed, scalability, and/or stability characteristics of the product under test that may have value in determining or improving product quality. Investigation is frequently employed to prove or disprove hypotheses regarding the root cause of one or more observed performance issues. Latency is a measure of responsiveness that represents the time it takes to complete the execution of a request. Latency may also represent the sum of several latencies or subtasks. Metrics are measurements obtained by running performance tests as expressed on a commonly understood scale. Some metrics commonly obtained through performance tests include processor utilization over time and memory usage by load. Performance refers to information regarding your application s response times, throughput, and resource utilization levels. A performance test is a technical investigation done to determine or validate the speed, scalability, and/or stability characteristics of the product under test. Performance testing is the superset containing all other subcategories of performance testing described in this chapter. Performance budgets (or allocations) are constraints placed on developers regarding allowable resource consumption for their component. Performance goals are the criteria that your team wants to meet
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Performance budgets or allocations Performance goals
before product release, although these criteria may be negotiable under certain circumstances. For example, if a response time goal of three seconds is set for a particular transaction but the actual response time is 3.3 seconds, it is likely that the stakeholders will choose to release the application and defer performance tuning of that transaction for a future release. Performance objectives 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 requirements are those criteria that are absolutely non-negotiable due to contractual obligations, service level agreements (SLAs), or fixed business needs. Any performance criterion that will not unquestionably lead to a decision to delay a release until the criterion passes is not absolutely required and therefore, not a requirement. 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 I/O, and network I/O that your application consumes. Performance targets typically equate to project goals. Performance testing objectives refer to data collected through the performance-testing process that is anticipated to have value in determining or improving product quality. However, these objectives are not necessarily quantitative or directly related to a performance requirement, goal, or stated quality of service (QoS) specification. 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. Resource utilization is the cost of the project in terms of system resources. The primary resources are processor, memory, disk I/O, and network I/O.
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