distribution/bin/mqnamesrv.xml

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<java>
    <debug>false</debug>

    <javahome>${JAVA_HOME}</javahome>

    <jvmtype>server</jvmtype>

    <mainclass>org.apache.rocketmq.namesrv.NamesrvStartup</mainclass>

    <properties>
        <java.ext.dirs>${cpd}/../lib</java.ext.dirs>
        <rocketmq.home.dir>${cpd}/..</rocketmq.home.dir>
    </properties>

    <classpaths>
    </classpaths>

    <options>
        <-Xms512m>
    </-Xms512m>
    <-Xmx1g>
</-Xmx1g>
<-XX:NewSize>256M</-XX:NewSize>
<-XX:MaxNewSize>512M</-XX:MaxNewSize>
<-XX:PermSize>128M</-XX:PermSize>
<-XX:MaxPermSize>128M</-XX:MaxPermSize>
    </options>
    </java>