WAS v8.5 > Monitoring > Monitoring overall system health > Enable PMI data page > Enable the Java virtual machine profiler dataJava virtual machine profiling
Use Java virtual machine profiling to gather data about your system for performance analysis.
The Java virtual machine Tool Interface (JVMTI) is a native programming interface that provides tools the ability to inspect the state of the JVM.
JVMTI provides the ability to collect information about the JVM that runs the application server. The Tivoli Performance Viewer leverages these interfaces to enable more comprehensive performance analysis.
JVMTI is a two-way function call interface between the JVM and an in-process profiler agent. The JVM notifies the profiler agent of various events, for example, garbage page and thread starts. The profiler agent activates or deactivates specific event notifications that are based on the needs of the profiler.
JVMTI supports partial profiling, by enabling you to choose which types of profiling information to collect and to select certain subsets of the time during which the JVM API is active. JVMTI moderately increases the performance impact. Therefore, IBM recommends that we use JVMTI monitoring to help diagnose application problems only.
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Enable the Java virtual machine profiler data