Recommended region size for Batch report Writer

Document ID : KB000124061
Last Modified Date : 27/02/2019
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Introduction:
 What is the  size of REGION parameter for batch report writer
Question:
Do you have some calculation formula or guideline to decide the size of REGION= parameter?
I usually recommend REGION=0M to acquire best performance.
 
Environment:
z/os
Answer:
There is no specific  recommended region size for Batch report Writer or guide lines for the Region setting.
There is a message produced at the end of the job which gives details of the Storage the job used .

Use this to get an understanding of the Storage Use.
Additonally there is details of CPU and Ziip use.

The Message: 
DBG98003I 07:38:50 ROUTINES USED 141239384 BYTES OF GETMAIN STORAGE