Paul Gilmartin wrote:
On Mon, 14 May 2012 09:23:46 -0400, John Eells wrote:
Another alternative is to reduce the number of libraries in the LPA list
(or in dynamic LPA). This will have an effect on system performance,
however, and there is another series of topics in section 1.4 of the
Initialization and Tuning Guide about the tradeoffs.
How much of LPA must be below 16M? I hope not all.
How much storage does LPA occupy in a typical-to-large shop?
<snip>
Sorry, I should have been more specific.
All of "LPA" is below 16MB, by definition. However, many of the
libraries in the LPA list (or dynamic LPA) have a mix of RMODE 24 and
RMODE 31 (or ANY) modules. It's the RMODE 24 ones that live in "LPA."
The others go into "ELPA," above the line.
So if the OP wants to investigate the size of LPA, some additional
analysis is needed to see how many of the LPA list libraries' modules
are RMODE 24.
I suspect LPA space varies quite a bit by workload and virtual storage
requirements (and to a much lesser extent, real storage requirements),
but I have no way to prove that.
--
John Eells
z/OS Technical Marketing
IBM Poughkeepsie
ee...@us.ibm.com
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