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Foglight for Virtualization Enterprise Edition 8.9 - Performance Tuning Field Guide

Overview Hardware and Operating System Tuning Management Server Tuning Java Virtual Machine Tuning Backend Database Tuning High Availability (HA) Tuning Agent Tuning Appendix: Performance Health Check Appendix: Analyzing a Support Bundle

Java Virtual Machine Tuning

Before you proceed with JavaTM Virtual Machine tuning, it is important to note the following:

Foglight® 5 is a Java application that ships with and uses the Oracle® Java Hotspot Virtual Machine (JVM). While there are other vendors of JVMs, the Oracle JVM should not be replaced or altered.

This section provides information on how to tune the JVM to achieve maximum performance.

Getting Started

The following factors heavily impact JVM utilization:

the length of the time period for which Foglight® is configured to preserve historical data about observations

Foglight JVM Configuration

To review or modify Foglight® JVM configuration options, locate the following file:


Foglight reads JVM options from values of server.vm.optionsX properties, where X is a number from 0 to 99.

For example:

NOTE: After any change to server.config, you must restart the server.

The JVM options currently in effect (the default Foglight JVM options, server.config settings, and command line arguments) are all logged in the server log file during startup.

JVM Options

The following table describes the most commonly used Oracle® Hotspot JVM options:

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