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type post
title JMX Space Statistics
categories SBP
parent production.html
weight 600
Author XAP Version Last Updated Reference Download
Shay Hassidim 6.6 Feb 2008

Overview

The attached example illustrates usage of the JMX API, getting the JVM statistics and the Space statistics. The example collects statistics and generates a consolidated report of the space and its JVM activity. This example supports both clustered and single space. For clustered space the report will include statistics for all cluster space members.

{{%note%}} As of version 10.1 and higher some functionality was removed from the JMX API. You should use the Admin API {{%/note%}}

The report will include the following columns:

  • Time
  • Space Container
  • Space Host Name
  • JVM thread Count
  • JVM heap Committed
  • JVM heap max
  • JVM heap used
  • Space read Count
  • Space write Count
  • Space update Count
  • Space take Count
  • Space Notify Registration Count
  • Space Trigger Count
  • Space Connections Count

You may view the report using any spread sheet tool, graph the statistics and find correlations between the space activity and the JVM behavior.

To install the example: Download the example and unzip it to an empty folder.

To run the example:

java -classpath ./;JSpaces.jar com.jmxutil.JMXSpaceStats jini://*/*/space space_stats.txt 10000

Example usage options:

java com.jmxutil.JMXSpaceStats space_url logfile sampling_duration

The example works both with JDK 1.5 and JDK 1.6.