You can use the JSS Database Utility to configure the minimum and maximum PermGen sizes for Tomcat.
Note: When upgrading from Tomcat 7 to Tomcat 8, the minimum and maximum PermGen sizes are automatically reset to 256 MB. When using Java 1.8, PermGen sizes do not need to be set.
Configuring Tomcat PermGen Size
Open the JSS Database Utility on the JSS host server.
The JSS Database Utility is located in:
Note: If the User Account Control settings are enabled, you must be logged in as the built-in Administrator.
If the JSS Database Utility is unable to locate the MySQL binary, you are prompted to enter the path. Click Continue and enter the full path to the binary.
From the menu bar, choose Utilities > Change Tomcat settings.
Use the PermGen Size sliders to configure the minimum and maximum PermGen sizes as needed.
Click Apply Settings.
When prompted to restart Tomcat, click Yes.