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. WebSphere Application Server, Version 6 supports the JavaTM 2 Platform, Enterprise Edition (J2EE) Management Reference Implementation (JSR-77).

In WebSphere Application Server, Version 6 and later, PMI counters are enabled, based on a monitoring or instrumentation level. The levels are None, Basic, Extended, All, and 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.

WebSphere Application Server provides a set of interfaces for retrieving PMI information from Mbeans. These interfaces are also identified in the JSR-77 specification. Changes in interface signatures from WebSphere Application Server, Version 5 to Version 6 might require some migration. We have provided a migration tool to assist you with these changes. The tool provides: To get the old statistics classes returned, you need to set a system property (for example, a –D option) to websphereV5Statistics=true on the client. If this property is set, the PMI interface returns the WebSphere Application Server statistics object instead of an object that implements the J2EE interface.



Related concepts
Custom PMI API
Related tasks
Enabling PMI data collection
Monitoring performance with Tivoli Performance Viewer (TPV)
Developing your own monitoring applications
Related reference
Third-party performance monitoring and management solutions
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Last updated: Aug 29, 2010 8:25:23 PM CDT
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