- Response Time
It's the amount of time a system takes to complete a task or request. - Responsiveness
It's about how quickly a system acknowledge a request as opposed to processing it.Latency - It's the minimum time to get some response of the system.
- Throughput
It's how much stuff the system can cod in a given amount of time. - Load
It's the statement of how much stress a system is under. - Load Sensitivity
It's a expression of how responsive time changes in relation with load. - Performance
It's either, performance (common sense), or throughput, depending on the case. - Efficiency
It's performance, divided by resources. - Capacity
It's an indication of maximum effective throughput or load. - Scalability
It's the measure of how adding resources affects performance. - Vertical Scalability
Means adding more power to single server to achieve better performance. - Horizontal ScalabilityMeans adding more servers to achieve better performance.
About these topics, it's important to enforce the following point:
- Responsiveness
It's sad how programmers - in general - don't care about it. A system, part of it, or even a screen with low responsiveness, decrease the User Experience, and sometimes it could cost the name of a hole system.
Reference
Fowler, Martin. Patterns of enterprise application architecture. Pearson Education. 2003.
