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Performance Monitoring Infrastructure (PMI)

Performance Monitoring Infrastructure (PMI) is the core monitoring infrastructure for WebSphere Application Server and WebSphere family products like Portal, Commerce, and so on. PMI provides a set of data that explains the runtime and application resource behavior. For example, PMI provides database connection pool size, servlet response time, EJB method response time, JVM garbage collection time, CPU usage, and so on.

Using PMI data, the performance bottlenecks in the application server can be identified and fixed. For example, one of the PMI statistics in the Java DataBase Connectivity (JDBC) connection pool is the number of statements discarded from prepared statement cache, which can be used to adjust the prepared statement cache size in order to minimize the discards and to improve the database query performance.

PMI data can be monitored and analyzed by Tivoli Performance Viewer, a graphical viewer for PMI data that ships with WAS. Performance advisors use PMI data to analyze the run-time state of the application server, and provide tuning advice to optimize the application server resource utilization. PMI data can also be used to monitor the health of the application server. Some of the health indicators are CPU usage, Servlet response time, and JDBC query time. Performance management tools like Tivoli Monitoring for Web Infrastructure and other third party tools can monitor the PMI data and generate alerts based on some predefined thresholds.


Subtopics


  • Third-party performance monitoring