WildFly and Garbage Collection Logging
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External
- How to enable Garbage Collection (GC) logging in EAP 6 domain mode https://access.redhat.com/solutions/269023
- Preventing GC log file overwrites upon restart in domain mode https://access.redhat.com/solutions/1325293
- How to rotate gc log file configured in domain mode in EAP 6? https://access.redhat.com/solutions/1132613
Internal
Overview
GC logging is enabled by default for standalone mode (to verify form which version on). It generates output to $JBOSS_HOME/standalone/log/gc.log.<digit>. The system uses log rotation with the number of log files limited to 5, and the size of each file limited to 3 MB.
Enabling GC Logging in Standalone Mode
TODO.
Enabling GC Logging in Domain Mode
Server Node
The GC logging can be enabled for a specific server node, or generically, across the server group.
To enable GC logging for just one server node, modify the corresponding <jvm> declaration in the host.xml file.
To enable GC logging for an entire server group, edit the <ivm-options> section corresponding to the <jvm> configuration specified for the server group, in domain.xml.
In both cases, add the following JVM options:
<jvm-options> <option value="-verbose:gc"/> <option value="-Xloggc:${jboss.server.log.dir}/gc.log"/> <option value="-XX:+PrintGCDetails"/> <option value="-XX:+PrintGCDateStamps"/> </jvm-options>
option values cannot contain system properties, they cannot be resolved:- java.lang.IllegalStateException: WFLYCTL0211: Cannot resolve expression '-Xloggc:/opt/jdg/domain/servers/${jboss.server.name}/log/gc.log'
Log File Path Specification
Host Controller
TODO.