Hello Tom,
Your remark about the region parm triggered me to look up the possible values
in the JCL reference.
It says:
REGION[.procstepname]={valueK}{valueM}
valueK: 1 - 7 digits from 1 - 2096128 valueM: 1 - 4 digits from 1 - 2047
Specifies the amount of space in kilobytes or megabytes required by the step.
Since the max valueM = 2047 and not 2048 I'm guessing that 2096128 does
actually mean 2GB even though it is 1MB less. For some historical reason a
region has always been assumed to be 1M ????
As a small response to your mail I would say that the z/OS nucleus, LPA, CSA
and SQA are still part of my region (address space), just not my private
region. Or is there a difference between region and address space....
Regards,
Erik.
OIB/TS/MPO/MP4
location code VO 01.39
PO Box 98000, 6800 MA Arnhem, The Netherlands
T +31 26 3672969, F +31 26 4423652
E [email protected]
-----Oorspronkelijk bericht-----
Van: IBM Mainframe Discussion List [mailto:[email protected]] Namens Tom
Marchant
Verzonden: dinsdag 29 juni 2010 17:46
Aan: [email protected]
Onderwerp: Re: TSO region size
On Tue, 29 Jun 2010 16:07:33 +0200, Erik Janssen wrote:
>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?
Doesn't the TSO SIZE specification work the same way as the JCL REGION
parameter? That is, a specification less than 16 MB allows the the specified
region below the line (if available) and
32 MB above and a specification greater than 16 MB sets the above the line
region.
In any case, there is quite a bit of storage that you can never use as part of
your region. The z/OS nucleus, LPA, CSA and SQA all limit the maximum
available region for your TSO session.
They add up to a lot more than 1 MB. You might only have about
1.5 GB available.
--
Tom Marchant
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