How to Set JVM Options for Jaspersoft Servers: Java Virtual Machine (JVM) runtime parameters normally need to be explicitly set so that the memory settings have values that are larger than the default settings and required to achieve optimal performance.
Release: All supported Jaspersoft releases
For Windows:
This only applies outside of Windows Service if you use startup.bat to start services
Note: If you are using a Windows Service, follow the instructions here to set up Maximum Memory: Configuring Jaspersoft as a Windows Service
For Non Windows:
You may set a higher memory, based on what free RAM your server OS has available