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The Relationship Between Performance Testing and Tuning
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When end-to-end performance testing reveals system or application characteristics that are deemed unacceptable, many teams shift their focus from performance testing to performance tuning, to discover what is necessary to make the application perform acceptably. A team may also shift its focus to tuning when performance criteria have been met but the team wants to reduce the amount of resources being used in order to increase platform headroom, decrease the volume of hardware needed, and/or further improve system performance.
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Although tuning is not the direct responsibility of most performance testers, the tuning process is most effective when it is a cooperative effort between all of those concerned with the application or system under test, including: Product vendors Architects Developers Testers Database administrators System administrators Network administrators Without the cooperation of a cross-functional team, it is almost impossible to gain the system-wide perspective necessary to resolve performance issues effectively or efficiently. The performance tester, or performance testing team, is a critical component of this cooperative team as tuning typically requires additional monitoring of components, resources, and response times under a variety of load conditions and configurations. Generally speaking, it is the performance tester who has the tools and expertise to provide this information in an efficient manner, making the performance tester the enabler for tuning.
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Tuning follows an iterative process that is usually separate from, but not independent of, the performance testing approach a project is following. The following is a brief overview of a typical tuning process: Tests are conducted with the system or application deployed in a well-defined, controlled test environment in order to ensure that the configuration and test results at the start of the testing process are known and reproducible. When the tests reveal performance characteristics deemed to be unacceptable, the performance testing and tuning team enters a diagnosis and remediation stage (tuning) that will require changes to be applied to the test environment and/or the application. It is not uncommon to make temporary changes that are deliberately
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designed to magnify an issue for diagnostic purposes, or to change the test environment to see if such changes lead to better performance. The cooperative testing and tuning team is generally given full and exclusive control over the test environment in order to maximize the effectiveness of the tuning phase. Performance tests are executed, or re-executed after each change to the test environment, in order to measure the impact of a remedial change. The tuning process typically involves a rapid sequence of changes and tests. This process can take exponentially more time if a cooperative testing and tuning team is not fully available and dedicated to this effort while in a tuning phase. When a tuning phase is complete, the test environment is generally reset to its initial state, the successful remedial changes are applied again, and any unsuccessful remedial changes (together with temporary instrumentation and diagnostic changes) are discarded. The performance test should then be repeated to prove that the correct changes have been identified. It might also be the case that the test environment itself is changed to reflect new expectations as to the minimal required production environment. This is unusual, but a potential outcome of the tuning effort.
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Performance, Load, and Stress Testing
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Performance tests are usually described as belonging to one of the following three categories: Performance testing. This type of testing determines or validates the speed, scalability, and/or stability characteristics of the system or application under test. Performance is concerned with achieving response times, throughput, and resourceutilization levels that meet the performance objectives for the project or product. In this guide, performance testing represents the superset of all of the other subcategories of performance-related testing. Load testing. This subcategory of performance testing is focused on determining or validating performance characteristics of the system or application under test when subjected to workloads and load volumes anticipated during production operations. Stress testing. This subcategory of performance testing is focused on determining or validating performance characteristics of the system or application under test when subjected to conditions beyond those anticipated during production operations. Stress tests may also include tests focused on determining or validating performance characteristics of the system or application under test when subjected to other stressful conditions, such as limited memory, insufficient disk space, or server failure. These tests are designed to determine under what conditions an application will fail, how it will fail, and what indicators can be monitored to warn of an impending failure.
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