The Tivoli® Performance Viewer provides an easy way to store real-time data for system resources, WebSphere® Application Server pools and queues, and applications in log files for later retrieval. You can start and stop logging while viewing current activity for a server, and later replay this data. Logging of performance data captures performance data in windows of time so you can later analyze the data.
You can study the sequence of events that led to a peculiar condition in the application server.
First, enable Tivoli Performance Viewer logging so performance data generated in the application server persists in a log file stored at a specific location. Later, using the replay feature in Tivoli Performance Viewer, view the performance data that was generated in exactly the same chronological order as it was generated in real time, enabling you to analyze a prior sequence of events.
You do not need to know the syntax and format in which log files are generated and stored. Do not edit log files generated by Tivoli Performance Viewer; doing so will irrecoverably corrupt or destroy the performance data stored in the log files.
You can create and view logs in the administrative console.
Starting with Version 8.0, the Tivoli Performance Viewer graph uses Dojo Technology for plotting the performance activity rather than the Scalable Vector Graphics (SVG) format. The Dojo format provides a better user experience and is more processor and memory efficient for the application server. The SVG format is still supported but is deprecated in Version 8 of this product. To use the SVG format and image format, set the JVM property to false; for example: com.ibm.websphere.tpv.DojoGraph=false. If the property is set to false, Dojo is disabled and Tivoli Performance Viewer displays interactive graphics using the SVG format or non-interactive graphics using the JPG format. By default, this property is set to a value of true to use the Dojo format.