Runtime Performance Advisor

The Runtime Performance Advisor (RPA) service runs inside each appserver process and has to be enabled explicitly. It basically uses the same rules engine as Tivoli Performance Advisor and will produce the same tuning recommendations. Since it has a only a very small performance impact, it can be enabled and left running for a longer period of time even during production if you experience performance problems. This way you can get important system tuning information and advice even when you are not actively monitoring the system by using Tivoli Performance Viewer and Advisor. For a detailed explanation on using the Runtime Performance Advisor, refer also to 16.11, Performance Advisors.

Tip: It is important to configure the number of processors in the Runtime Performance Advisor configuration panel, otherwise the recommendations can be inaccurate.

However, keep in mind that both TPA and RPA advice can only be accurate if your application runs with production level load, and without exceptions and errors. This is best done by running a performance test, where a production level load can be simulated in a reproducible manner. Both advisors will need the CPU utilization to be high to provide advice, which is best accomplished during a load and stress test.

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