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# Monitor the JRockit Virtual Machine

If you run a server with the JRockit Virtual Machine (VM), you can view runtime data about the underlying JRockit VM and the memory and processors on the computer that is hosting the VM.

To monitor the JRockit VM:

1. If you have not already done so, in the Change Center of the Administration Console, click Lock & Edit (see Use the Change Center).
2. Use the JRockit VM to start the server instance.
3. In the Administration Console, expand Environment and select Servers.
4. On the Servers page, click the name of a server that is using the JRockit VM. Then select Monitoring > JRockit.

   To view additional data about the VM, such as how long it spends in a specific method, use the JRockit Management Console. Note that if you want to use the JRockit Management Console, you must include the `-XManagement` startup option when you start the server. (You do not need this option to use the WebLogic Server Administration Console to monitor the VM.) For more information, refer to "JRockit Documentation Home Page."

5. To activate these changes, in the Change Center of the Administration Console, click Activate Changes.
   Not all changes take effect immediately—some require a restart (see Use the Change Center).

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