- A Cloud Guru
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.
Table of Contents
Enable Huge Pages via the Kernel
To enable huge pages from the kernel, we can use the
sudo sysctl -w vm.nr_hugepages=1
Enable Large Pages via JBoss EAP
- Move into the JBoss EAP home directory:
- Open the standalone configuration:
sudo vim standalone/configuration/standalone.xml
- Add the following under
<system-properties> <property name="JAVA_OPTS" value="-XX:+UseLargePages"/> </system-properties>
Restart the Service
- Restart JBoss EAP:
sudo systemctl restart jboss-eap-rhel
- Grep the server log for startup warnings:
cat standalone/log/server.log | grep WARNING
What's a lab?
Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.