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What is jvmstat?

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Question: What is jvmstat?

Answer: 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.

Tools include a general purpose command line tool called jvmstat, a java process list tool called jvmps, and a generational heap visualization tool called visualgc. Remote monitoring is supported via an RMI server application.

The instrumented HotSpot JVM shipped with J2SE 1.4.1 as a technology preview. The instrumentation is disabled by default, but can be easily enabled through a command line argument. The tools included with this distribution can only monitor Java applications running on the HotSpot 1.4.1 JVM as distributed with Sun's J2SE 1.4.1 product.

The jvmstat feature includes a number of tools:

jvmstat - A tool to sample and log instrumentation

jvmps - A tool providing a simple Java process listing

visualgc - A tool to graphically display instrumentation

perfagent - A server providing remote access to instrumentation

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