If you want to find out the “optimum number of work processes“ required for your SAP system , then you can use the following methods to do this…

METHOD – 1

Go to AL12 –> Statistics –> Cursor Cache –> All Servers

You will see the “Total no of requests for each work process” if all the dialog work processes have “large no of requests” then you should add additional “Dialog Work Processes”. Otherwise you can decrease the number of “Dialog Work Processes” for saving the system resources.

METHOD – 2

You will see the “CPU total times of the work processes” . If you have Work Processes which have less “CPU Time” Appox. less than 0:20 then you should decrease the number of work process of that type , otherwise you may decide to increase that type of work process number.