Cannot allocate more than 1.5GB memory for JBoss EAP

Solution Verified - Updated -

Issue

  • Need to increase heap size greater than 1.5GB for JDK based on application requirements
  • JBoss runs really slow with currently allocated memory.
  • When increased JDK memory using $JBOSS_HOME/jboss-as/bin/run.conf file's JAVA_OPTS, system complains that it does not have enough memory.
  • Output of free -g shows that system has 10GB of memory available.
  • We are trying to allocate more memory at JBoss server start up; we currently start server with 2048m as -Xms and 2048m as -Xmx. After some rounds of testing we found that we can start JBoss with 3072m but with 4096m server is not starting .

Environment

  • Red Hat JBoss Enterprise Application Platform (EAP)
    • 5.x
    • 6.x
  • Red Hat Enterprise Linux (RHEL)
    • 5.10
  • Open JDK
    • 1.6.27
  • Oracle JDK

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