Introduction to the WebSphere Real Time perspective
The WebSphere® Real Time perspective (WRTP) helps you trace specific WebSphere Real Time (WRT) events over time.
The perspective helps you identify unusual or exceptional events that might occur when you run a WRT application. The trace information can be presented in various ways, including linear or logarithmic scales, and histograms. WRTP provides some pre-defined trace point views that are especially helpful.
- Data about class loading, which lets you identify factors that have a significant impact on application performance.
- Java™ method execution.
- The component to which the specific target operation belongs.
- An entry trace point, representing the start of a specific target operation and a parameter within that operation.
- One or more exit trace points, representing the end of a specific target operation and a parameter within that operation.
- One or more information trace points, enabling you to filter specific detail from among the data collected during the trace.
The predefined trace point views are supplied as a resource bundle, and are automatically provided within the Health Center GUI. You can create and customize more views, and make them available to Health Center by adding them to a custom view store.
Data about trace points is recorded to help with the analysis. For example, each time the application reaches an entry trace point, the operation start time is recorded. Similarly, when the corresponding exit point is reached, the time is recorded and the total time to perform the operation is calculated. This data is used for graphical displays of information, and also for determinism calculations.
- Class loading, showing the time spent in class loading.
- Incremental garbage collection, showing the time taken by the global garbage collection cycle.
- JIT compilation, showing the time spent in various compilation phases.
- Synchronous garbage collection, showing the time spent in synchronous garbage collection.
- User driven garbage collection, showing the time taken in garbage collection cycles invoked by the application.