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- 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.
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Table of Contents
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Challenge
Enable Huge Pages via the Kernel
To enable huge pages from the kernel, we can use the
sysctlcommand:sudo sysctl -w vm.nr_hugepages=1 -
Challenge
Enable Large Pages via JBoss EAP
- Move into the JBoss EAP home directory:
cd /opt/jboss-eap/- Open the standalone configuration:
sudo vim standalone/configuration/standalone.xml- Add the following under
extensions:
<system-properties> <property name="JAVA_OPTS" value="-XX:+UseLargePages"/> </system-properties> -
Challenge
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
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