As for the selection of "good old data" to be thrown out by CP: - Linux can tell CP that it no longer needs certain storage pages using a diagnose code. If it does ??? - CRM 2 is a Linux/CP co-operative feature by which CP would know what kind of data resides in which Linux pages. For example: if CP knows a page is used to cache disk data, it doesn't need to page it out, Linux can read it back in from its disks. - Apart from that, CP's selection of candidates to page out from central storage is not as clever is in z/OS: it only uses the last reference bit. That is why a z/VM installation would be configured with some amount of expanded storage, because there is a timestamp for each expanded storage page that allows CP to select old pages for pageout.
2009/2/10 Barton Robinson <[email protected]>: > In ESALPS, ESAUSPG shows by user. ESAUCD2 shows if you have extra cache or > buffer. If you can send your reports, we will analyze it at no charge. > > Martin, Terry R. (CMS/CTR) (CTR) wrote: >> >> Hi >> >> >> I seem to be doing a lot of paging currently on my z/VM 5.3 system I am >> running multiple Linux guests including a large Oracle guest (40 GB memory >> size). How can I find out 1) who is doing the majority of the paging and >> along with that 2) I believe that some of the paging slots are old data in >> other words the pages are not going away after a task is complete how can I >> research this. The Linux guests have not been recycled but I thought if they >> had allocated the slots that after a task within the Linux guest completed >> that the slots would be reclaimed. Any thoughts on all of this would be >> appreciated. >> >> >> //Thank You,// >> >> >> //Terry Martin// >> >> //Lockheed Martin - Information Technology// >> >> //z/OS & z/VM Systems - Performance and Tuning// >> >> //Cell - 443 632-4191// >> >> //Work - 410 786-0386// >> >> //[email protected] <mailto:[email protected]>// >> >> > -- Kris Buelens, IBM Belgium, VM customer support
