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...(snip)...One important concept (that no one has mentioned so far?) is that the amount of memory specified for each pool is the amount of "real main storage" assigned to that pool. This can have very little to do with the amount of virtual memory that might actually be allocated in that pool at any given time (e.g. objects or parts of objects from Single Level Store that are paged into that pool, etc.)
Take care here -- most of what I wrote was in hopes of teasing comments out from others. But, as you can see, essentially nobody has anything to add.
I can't tell if (a) everything I wrote was correct, (b) nobody knows what the 'correct' things are, (c) there are those who know but won't join a discussion, (d)...?Another important topic to consider is the degree of multiprogramming (also called the "multiprogramming level" or "MPL" in the OS/400 literature). This is controlled by specifying the maximum number of jobs that can run in a given subsystem.
I remain baffled over the scarcity of work/performance management info. It's one area that always gets included in lists of "Why the (AS/400, iSeries, System i...) is so great." If nobody out in the world really knows, what good does it do?I think the main reason there is not a lot of material about these topics is that they are somewhat esoteric and very technical and usually only a small percentage of OS/400 or i5/OS shops have the expertise in-house to do this kind of "tuning". I suspect that many or even most OS/400 and i5/OS customers just run with one of the "vanilla" configurations as shipped by IBM with the system (either QBASE as the controlling subsystem or QCTL.)
Tom LiottaFor anyone who is really interested, here are a few excellent references:
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