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Enabling Large Pages for JBoss EAP

The JBoss Enterprise Application Server allows users to deploy and manage Java applications — and part of this management is making sure our Java apps run smoothly. For memory-intensive applications, this can mean enabling optimization features such as large pages, which locks pages in memory for faster retrieval — albeit at the expense of a non-application performance. In this lab, we enable large pages and ensure there are no memory issues in our application.

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Path Info

Clock icon Beginner
Clock icon 15m
Clock icon Jan 24, 2020

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Table of Contents

  1. Challenge

    Enable Huge Pages via the Kernel

    To enable huge pages from the kernel, we can use the sysctl command:

    sudo sysctl -w vm.nr_hugepages=1
  2. Challenge

    Enable Large Pages via JBoss EAP

    1. Move into the JBoss EAP home directory:
    cd /opt/jboss-eap/
    1. Open the standalone configuration:
    sudo vim standalone/configuration/standalone.xml
    1. Add the following under extensions:
            <property name="JAVA_OPTS" value="-XX:+UseLargePages"/>
  3. Challenge

    Restart the Service

    1. Restart JBoss EAP:
    sudo systemctl restart jboss-eap-rhel
    1. Grep the server log for startup warnings:
    cat standalone/log/server.log | grep WARNING

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