jvmstat 3.0
The jvmstat technology adds light weight performance and configuration instrumentation to the HotSpot JVM and provides a set of monitoring APIs and tools for monitoring the performance of the HotSpot JVM in production environments. The instrumentation is designed such that it is 'always on', yet has negligible performance impact. The monitoring interfaces added to the HotSpot JVM are proprietary and may or may not be supported in future versions of the HotSpot JVM.
Introduction
HotSpot™ Monitoring Tools and Utilities
Download
Installation
Instrumentation
Support (including the jvmstat FAQ)
The instrumented HotSpot JVM ships with J2SE 1.4.2 and later,
providing always-on instrumentation. The HotSpot JVM, verion 1.4.1,
also includes the the instrumentation, but it must be enabled with the
-XX:+UsePerfData flag.