WildFly JVM Settings
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Internal
Overview
JVM settings can be declared in the server's configuration files, as shown below, and are propagated to server node JVMs. In domain mode, the JVM settings for the process controller and host controller JVMs are declared in a different location.
Configuration
Standalone Mode
Modify standalone.conf as follows:
... JAVA_OPTS="-Xms1000m -Xmx2000m -XX:MetaspaceSize=256m -XX:MaxMetaspaceSize=512m ..." ...
Even if standalone*.xml allows for a <jvm> element, it seems it is not honored when specified. More research is needed on this.
Domain Mode
domain.xml
<domain ...> ... <server-groups> <server-group name="..."> <jvm java-home="..." type="SUN|IBM" env-classpath-ignored="true" debug-enabled="false" debug-options="..."> <heap size="" max-size=""/> <permgen>...</permgen> <stack>...</stack> <agent-lib>...</agent-lib> <agent-path>...</agent-path> <java-agent>...</java-agent> <jvm-options> <option name="...">....</option> ... </jvm-options> <environment-variables>...</environment-variables> <launch-command>...</launch-command> </jvm> </server-group> </server-groups> ... </server>
Example:
<jvm> <heap size="1000m" max-size="2000m"/> <jvm-options> <option value="-server"/> <option value="-XX:MetaspaceSize=256m"/> <option value="-XX:MaxMetaspaceSize=512m"/> </jvm-options> </jvm>
host.xml
host.xml allows "named" <jvm> declarations.
<host ..> ... <jvms> <jvm name="jvm-a" ...> </jvm name="jvm-b" ...> ... </jvms> ... </host>