Tuesday, January 19, 2010

Performance tuning is the improvement of system performance. This is typically a computer application, but the same methods can be applied to economic markets, bureaucracies or other complex systems. The motivation for such activity is called a performance problem, which can be real or anticipated. Most systems will respond to increased load with some degree of decreasing performance.
A system's ability to accept higher load is called scalability, and modifying a system to handle a higher load is synonymous to performance tuning.

• Systematic tuning follows these steps:
1. Assess the problem and establish numeric values that categorize acceptable behavior.
2. Measure the performance of the system before modification.
3. Identify the part of the system that is critical for improving the performance. This is called the bottleneck.
4. Modify that part of the system to remove the bottleneck.
5. Measure the performance of the system after modification.

This is an instance of the measure-evaluate-improve-learn cycle from quality assurance.
A performance problem may be identified by slow or unresponsive systems. This usually occurs because high system loading, causing some part of the system to reach a limit in its ability to respond. This limit within the system is referred to as a bottleneck.
A handful of techniques are used to improve performance. Among them are code optimization, load balancing, caching strategy, and distributed computing, and self-tuning.
The topics covered in this are:-
1. Performance analysis
2. Performance engineering
3. Code optimization
4. Caching strategy
5. Load balancing
6. Distributed computing
7. Self-tuning
8. Bottlenecks

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