Monitoring Server Performance
Making the adjustments described in this guide without measuring their effects does not make sense. If you do not measure the system’s behavior before and after making a change, you would not know whether the change was a good idea, a bad idea, or merely irrelevant. You can monitor the performance of Web Server in several different ways.
Table 1-1 Methods of Monitoring Performance
| Monitoring Method | How to Enable | How to Access | Advantages and Requirements |
|---|---|---|---|
| Statistics through the Admin Console | Enabled by default | In the Admin Console, for a configuration, click the Monitor tab | Accessible when session threads are hanging. Administration Server must be running. |
| Statistics through individual wadm commands | Enabled by default | Through wadm commands: get-config-stats get-virtual-server-stats get-webapp-stats get-servlet-stats |
Accessible when session threads are hanging. Administration Server must be running. |
| XML-formatted statistics (stats-xml) through a browser | Enable through Admin Console or through editing a configuration file | Through a URI | Administration Server need not be running. |
| XML-formatted statistics (stats-xml) through the command-line interface | Enabled by default | Through the wadm command get-stats-xml |
Accessible when session threads are hanging. Administration Server must be running. |
| perfdump through a browser | Enable through Admin Console or through editing a configuration file | Through a URI | Administration Server need not be running. |
| perfdump through the command-line interface | Enabled by default | Through wadm command get-perfdump |
Accessible when session threads are hanging. Administration Server must be running. |
| Java ES Monitoring | Enabled by default | Through the Java ES Monitoring Console | Only for Java ES installations. Administration Server must be running. |
Monitoring the server does have some impact on computing resources. In general, using perfdump through the URI is the least costly, followed by using stats-xml through a URI. Because using the Administration Server requires computing resources, the command-line interface and the Admin Console are the most costly monitoring methods.
For more information on these monitoring methods, see the following sections:
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