Set the Execute Queue Thread count to be more than the number of CPUs. For example, consider using a value that is twice the number of CPUs. Set this value in either the console or in the /usr/local/bea/user_projects/domains/mydomain/config.xml file:
<ExecuteQueueName="MyExecute Queue" ThreadCount="8" ThreadsIncrease="4"/>
For more information, see “Modifying the Default Thread Count” in “WebLogic Server Performance and Tuning” at:
http://e-docs.bea.com/wls/docs81/perform/WLSTuning.html#1142218