The CA Workload Automation DE is a Java application. By default the heap is set to 1 GB. This may be increased if the server is constantly at or above 80-90% of the Maximum memory available (see screenshot below).
CA Workload Automation DE 11.3 / R12.x
The heap can only be changed on the server side.
For DE running on Linux/UNIX system
The entire server (OS) does not need to be rebooted. Only restart the CA WA DE service for the change to take affect.
The total memory set in DE must always be available or free at system level. Never set the heap to maximum system level memory. Always leave 30-40% of physical memory for OS and other applications.