Tuning performance

When you have identified a performance problem, you will want to tune the system to fix it.

The primary aim of performance tuning is to make the most efficient use of the system resources. Performance tuning is a way to adjust the performance of the system either manually or automatically. Many options exist for tuning your system. Each system environment is unique in that it requires you to observe performance and make adjustments that are best for your environment; in other words, you are required to do routine performance monitoring.

IBM^® also offers a tool that allows you to improve both the I/O subsystem and system response times by reducing the number of physical I/O requests that are read from disk. You can improve your system performance with Extended Adaptive Cache.

In addition, you may also want to consider some tuning options that allow processes and threads to achieve improved affinity for memory and processor resources.

• Performing basic system tuning
  To tune your system's performance, you need to set up your initial tuning values, observe the system performance, review the values, and determine what to tune.

• Adjusting performance automatically
  Most users should set up the system to make performance adjustment automatically. When new systems are shipped, they are configured to adjust automatically.

• Determining when to use simultaneous multithreading
  Simultaneous multithreading allows sharing of process facilities to run two applications or two threads of the same application at the same time.

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Related concepts
Extended Adaptive Cache