Java Performance - Definitions for Performance Engineerings

• Performance monitoring
• Is an act of nonintrusively collecting or observing performance data from an operating or running application.
• Monitoring is usually a preventative or proactive type of action and is usually performed in a production environment, qualification environment, or development environment.
• Monitoring is also usually the first step in a reactive situation where an application stakeholder has reported a performance issue but has not provided sufficient information or clues as to a potential root cause.
• In this situation, performance profiling likely follows performance monitoring.
• Performance profiling
• In contrast to performance monitoring is an act of collecting performance data from an operating or running application that may be intrusive on application responsiveness or throughput..
• Performance profiling tends to be a reactive type of activity, or an activity in response to a stakeholder reporting a performance issue, and usually has a more narrow focus than performance monitoring.
• Profiling is rarely done in production environments. It is typically done in qualification, testing, or development environments and is often an act that follows a monitoring activity that indicates some kind of performance issue.
• Performance tuning
• In contrast to performance monitoring and performance profiling, is an act of changing tune-ables, source code, or configuration attributes(s) for the purposes of improving application responsiveness or throughput.
• Performance tuning often follows performance monitoring or performance profiling activities.

Reference:

Performance engineering - Wikipedia, the free encyclopedia