On Fri, 1 Sept 2023 at 09:55, Scott Chapman <000003fffd029d68-dmarc-requ...@listserv.ua.edu> wrote: > > There are two levels of dispatching here: PR/SM dispatches zIIP cores for the > LPARs to use. Whether the LPAR uses both threads on that core or not depends > on the z/OS setting. With SMT enabled, it looks like you have twice as many > zIIPs as the LPAR has online zIIP cores. But (IIRC) the even-odd pairs are > really two threads on the same zIIP core.
I'm obviously missing something here, but since I don't do production on Real Iron, I haven't been following SMT closely... Jim's original question didn't mention zIIPs. Do PR/SM and z/OS not follow similar rules for multi threading on CPs as for zIIPs? Is there something inherently magic about zIIPs in this context, beyond that z/OS won't routinely dispatch general work to them? Tony H. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
