Tuning the Scheduler Server Settings

You can sometimes improve Scheduler performance by adjusting the following settings on the Edit Server Settings page:

• Maximum Concurrent Tasks. Specifies the maximum number of tasks that the Scheduler can run at one time.

  When more tasks are ready to run than the Maximum Concurrent Tasks setting allows, the extra tasks must wait until there is room available or until they are run on another server.

  If too many tasks are being swapped out of memory and sharing CPU time, the overhead slows down performance. Alternatively, setting the maximum too low results in idle time. The Scheduler checks for available tasks every minute, so a waiting task waits at least a minute before being run.

  The default Maximum Concurrent Tasks setting (100) is usually adequate. You can decide whether to adjust this setting up or down based on which tasks are being run in the deployment and by profiling the runtime behavior after the deployment is otherwise complete.

  Before you change this setting, you may want to observe the Scheduler using JMX. The Scheduler.executingTaskCount attribute shows how many tasks the Scheduler is running.

  In some cases, you might want to suspend or disable the Scheduler. For example, if you want a server dedicated to handling the End User interface, disabling the Scheduler will prevent tasks from running on that server. The server would only serve the End User interface pages and store launched tasks for other servers to execute.

• Task Restrictions. Specifies the set of tasks that can execute on the server.

  The Task Restrictions setting can provide a finer granularity of control over what tasks are allowed to run on a server. You can restrict tasks individually or through the server settings.

Recommending generic, optimal settings is not possible because deployments are so different. Scheduler settings must be adjusted differently for each deployment environment.

To Change the Scheduler Server Settings

1. Log in to the Administrator interface.

2. Click the Configure -> Servers -> Scheduler tabs.

3. When the Edit Server Settings page is displayed, adjust the settings as necessary.

   See Editing Default Server Settings for more information.