It's more complicated than that. Although I would agree that if an LPAR has only a single zIIP, likely SMT would be a good idea. But B is not true for intervals that people usually consider when looking at utilization levels because at the level of dispatch intervals, it's much more likely there's at least some intervals where the zIIPs are 100% busy. It really depends on arrival patterns and how much you care about very short transactions that may be running on the zIIPs.
On Mon, 4 Sep 2023 20:10:31 +1000, Andrew Rowley <and...@blackhillsoftware.com> wrote: >The current situation sounds like SMT-2 should only be used if you > >a) have a single zIIP > >or b) are running your zIIPs consistently 100% busy > >and for b) you need to turn it off when the workload reduces? > >-- >Andrew Rowley >Black Hill Software > >---------------------------------------------------------------------- >For IBM-MAIN subscribe / signoff / archive access instructions, >send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
