7.10 Analyzing the factors of Full GC using the extended verbosegc information
This section explains how to use the extended verbosegc information to analyze the factors that contribute to Full GC being triggered when using serial GC. 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:
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Memory size used by each area before and after GC is executed
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Factors that contribute to GC occurring
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 14.2 Details of JavaVM extension options in the uCosminexus Application Server Definition Reference Guide.