The JVMGCTest reports the performance statistics pertaining to the WebLogic JVM's garbage collection (GC). The default parameters associated with this test are as follows:

• The TEST PERIOD list box helps the user to decide how often this test needs to be executed.

• In the HOST text box, the host name of the server for which the test is to be configured has to be specified.

• In the PORT text box, enter the port number at which the WebLogic server listens.

• In the JREHOMEDIR text box, enter the path to the directory in which the WebLogic server's JVM exists.

• In the LOGFILENAME text box, specify the full path to the WebLogic server's log file which stores the GC output.  

• If multiple components of the same component type are awaiting configuration, then an APPLY TO OTHER COMPONENTS check box will appear in this page. Clicking on this check box will allow you to apply the configuration to all/selected components of that type.

• Once the necessary values have been provided, clicking on the UPDATE button will register the changes made. If multiple servers of a similar type are being monitored, then clicking on the UPDATE button will invoke a message box that prompts the user to apply the specified configuration to the other servers as well. Click on the OK button in the message box to apply the configuration to the other servers, or the Cancel button to proceed without applying. 

When changing the configuration for specific servers, a “*” beside the text box corresponding to the parameter signifies that these values have to be manually configured by the user. The parameter values that require to be configured will typically be prefixed with a “$” or contain a series of “*”. A value of "none" in the parameter value indicates that the corresponding parameter value can be changed if required.