Barbara Nitz wrote:
When z/OS 1.2 came out, I changed IEFUSI to only allow about the size of the DB2 buffer pools (as we have them now) as a MEMLIMIT. In addition, I set SMFPRMxx MEMLIMIT to zero. So anyone requesting storage above the bar gets an abend first time around. So I know when we need to put more pagespace in action. So far no one needed space above the bar....
"Needed" is an interesting term in this context. Your list of 64-bit exploiters is probably waaaay too short! Remember, the abend will be detected only by programs that make unconditional requests for storage. Quite a bit of of code -- especially from ISVs -- is written to use 64-bit storage only when its available.
For example, the common 'memory manager' used by many of our products begins with conditionally trying to get 64-bit storage. If unavailable, it falls back to conditionally creating a 31-bit data space. If unavailable, it falls back to conditionally acquiring 31-bit storage from the primary address space. If unavailable, it falls back to using 24-bit storage from the primary address space (never seen this last one happen).
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