7.9 How to analyze the factors of a full garbage collection using the extended verbosegc information

This section explains how to analyze the factors responsible for a full garbage collection by using the extended verbosegc information. The extended verbosegc information is the log information of JavaVM that can be output by specifying the -XX:+HitachiVerboseGC option that is a JavaVM option. In addition to the information that is useful for tuning, the information that is also useful for analyzing the cause of errors, is output.

You can check the following information, by referring to the extended verbosegc information when tuning:

You can output further detailed information by combining the -XX:+HitachiVerboseGC option with another JavaVM option. For details about the -XX:+HitachiVerboseGC option and other JavaVM extended options, see 16.2 Details on JavaVM extended options in the uCosminexus Application Server Definition Reference Guide.

Organization of this section
7.9.1 Overview of the output format of extended verbosegc information
7.9.2 Example of output of extended verbosegc information when full garbage collection occurs