The default region size above the line when specifying a size below 16MB is
32MB. When you specify a region size greater than 16MB then you are allowed as
much of the private as is available below the line and whatever you specified
above the line (assuming there are no exits in place to override this).
As to the limit, you may be able to type in a number that large (2GB) but you
are limited to the size of the private area above the line, minus the SWA/LSQA.
The private region above the line is limited to 2GB minus the CSA / MLPA /
PLPA / SQA / Read/Write Nuc / Read-only Nuc / 16MB (below the line).
As an example I have one system with an 820MB extended CSA, so the total
extended common area is 935MB, leaving 1,097MB for the extended private and
then you have the SWA/LSQA (private area above the line from the top down).
I currently default the region size above the line to 128MB which works in most
cases. As to the limit of 2091628 KB you will never be able to specify a
number close to this as you will require more than 1024KB for the extended
common area.
I hope this helps.
Bruce
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of
Erik Janssen
Sent: Tuesday, June 29, 2010 10:08 AM
To: [email protected]
Subject: TSO region size
Hello List,
We are standardising our default TSO region sizes on 64MB since we start seeing
more and more problems with programs abending, because people still have 4MB
region size as a default. 64MB seemed like a reasonable value to solve some of
the issues and not introduce any new.
Testing the changes I noticed when I log on to TSO the help panel says that the
maximum possible region size is 2096128. This is 1 MB less than 2 GB, which
would be 2097152. Can somebody tell me why the max is not exactly 2GB?
Regards,
Erik Janssen.
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