Term Definition: Quality of Service (QoS) |
Main Description
A Quality of Service (QoS) is limitation on some aspect of functionality of a system or system part. Also know as "performance requirement" or "nonfunctional requirement", a quality of service is often represented with a UML constraint or a SysML Requirement. Some QoS properties are: Time Worst case execution time Average execution time Blocking time Period Jitter Minimum inter arrival time read-time write-time Burst length Event arrival pattern Event arrival rate Event arrival probability distribution function Reliability Error rate Risk Safety Mean Time Between Failures (MTBF) Defect rate Cost memory usage resource usage portability maintainability complexity schedulability availability usability
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