Configuring Java Virtual Machine Performance Properties

To optimize Java Virtual Machine performance for all servers in the cluster, configure the maximum and minimum heap sizes, thread stack size, and user options such as enabling trace upload to SAP® Solution Manager.

1. Open SAP Control Center.
2. In the left navigation pane, select the Configuration tab.
3. In the right administration pane, click the General tab.
4. From the menu bar, select Performance.
5. Select Java Virtual Machine, then click Properties.
6. Configure these Java Virtual Machine performance properties, as required:
   • Maximum Heap Size – the maximum size of the JVM memory allocation pool. Use K to indicate kilobytes, M to indicate megabytes, or G to indicate gigabytes. For production recommendations on this value, see SAP Mobile Server Replication Tuning Reference in System Administration.
   • Minimum Heap Size – the minimum size of the JVM memory allocation pool, in megabytes. For production recommendations on this value, see SAP Mobile Server Replication Tuning Reference in System Administration.
   • Thread Stack Size – the JVM -Xss option.
   • User Options – other JVM options.

     For example, you can enable JVM garbage collection logging by setting -XX:+PrintGCDetails.

     If you are in an SAP environment and want to define the Solution Manager URL into which trace files can be uploaded, use this user option: -Dcom.sap.solutionmanager.url=<SolutionManager_URL>.

     Note: Enter options as a series of Java system property and value pairs, delimited by spaces, with this syntax:

     -DpropertyName1=value1 -DpropertyName2=value2

     For information on troubleshooting JVM settings, see SAP Mobile Server Fails to Start Due to Incorrect JVM Settings in Troubleshooting.

     To update the disk cache size, use the -ds user option. The disk cache size must be followed by k, m, or g, for example, -ds 10G.

7. Click Ok.