>Is it possible to monitor how much percent of this physical memory is >currently used (via Assembler).
I believe it is possible, if meaningless (explained later), to monitor memory usage, yourself. But, rather than resort to homegrown, there are existing options such as OMEGAMON, or even RMF Monitor II/III. >So, if paging is active this value should be over 100%. No, that's not how z/OS paging works. Regardless of how active paging is, z/OS always maintains an available frame queue (AFQ) in case of a sudden need. The size of the AFQ depends on many factors, including options specified/defaulted in IEAOPTxx. The use of memory is not an indicator of any system performance issues; the SRM/ASM/RSM combo has a concept of 'lazy pages', and if demand is low those are not paged out. One (of many) reasons why the MSO SDC is recommended to be zero. The only true indication of memory stress is the page fault rate (demand page ins per second), and even that has to be taken into account with response time. Only when paging is 'too high' there is an impact on response time. Memory usage is 'never' 100%, and if it were there would be huge system issues. And, it is 'never' an indication of performance, good or bad. - I'm a SuperHero with neither powers, nor motivation! Kimota! ---------------------------------------------------------------------- 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
