JIRA Server Administration - JIRA 6.x Administration Topic - page 12

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By default, JIRA is set to use a maximum of 768 MB of memory. For a production deploy-
ment, you might need to increase the amount of memory allocated to JIRA. You can in-
crease this by opening up the setenv.sh (on Linux) or setenv.bat (on Windows) file
in the JIRA_INSTALL/bin directory and changing the value for the
JVM_MAXIMUM_MEMORY parameter. For example, if we want to set the maximum
memory to 2 GB, we will change it to JVM_MAXIMUM_MEMORY="2048m" . You will
need to restart JIRA after performing this change. For production uses, it is recommended
that you allocate at least 2 GB of memory to the JIRA JVM.
If you are using LDAP for user management in your organization, refer to the Integrating
with LDAP for authentication only recipe in Chapter 4 , User Management .