PMI architecture
The Performance Monitoring Infrastructure (PMI) uses a client-server architecture.
The server collects performance data from various WebSphere Application Server components. A client retrieves performance data from one or more servers and processes the data. WAS v6 supports JSR-077.
In WAS v6 and later, PMI counters are enabled, based on a monitoring or instrumentation level. The levels are...
- None
- Basic
- Extended
- All
- Custom
These levels are specified in the PMI module XML file. Enabling the module at a given level includes all the counters at the given level plus counters from levels below the given level. So, enabling the module at the extended level enables all the counters at that level plus all the basic level counters as well.
JSR-077 defines a set of statistics for J2EE components as part of the StatisticProvider interface. The PMI monitoring level of Basic includes all of the JSR-077 specified statistics. PMI is set to monitor at a Basic level by default.
The server collects PMI data in memory. This data consists of counters such as servlet response time and data connection pool usage. The data points are then retrieved using a Web client, a Java client, or a JMX client. WAS contains Tivoli Performance Viewer, a Java client which displays and monitors performance data.
The figure shows the overall PMI architecture. On the right side, the server updates and keeps PMI data in memory. The left side displays a Web client, a Java client, and a JMX client retrieving the performance data.
Related concepts
Custom PMI API
Related tasks
Enabling PMI data collectionMonitor performance with TPV
Developing your own monitoring applications