Gerhard Adam wrote: > There hasn't been a lot of detail published about the z/OS 1.8 changes, but > it seems that the changes in UIC (as well as the change to global > management) would preclude block paging functions. If I recall, the > concept of block paging involved stealing pages from within an address space > that shared the same UIC value. Both of these concepts no longer exist (in > that form), so it would seem that without some other change being > indicated, block paging would no longer function as previously.
I'm inclined to agree. We've said relatively little - and it's a change in algorithm with really quite big implications. And not having like-UIC pages to form a block is tough. Actually this one aspect is one I've neglected to put much emphasis in my "Memory Matters in 20xx" presentation so thanks everyone for prompting me to think I need to add another foil (at the time when I was pushing stuff into a backup foils section like crazy). I DO have material on the RSM rewrite in the presentation and recent customer experiences have reinforced my view that it's a poor idea to go into R.8 (or beyond it) with any kind of real memory constraint at all. The whole point of the rewrite is to cut memory management impact and cost for large memory environments where the value of memory management is slight i.e case where you don't often have to choose WHO to push out to page data sets. Martin Martin Packer Performance Consultant IBM United Kingdom Ltd +44-20-8832-5167 +44-7802-245-584 [EMAIL PROTECTED] Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
