There is no MT on general purpose processors. Only on zIIPs can it be enabled.
Mark Jacobs Sent from ProtonMail, Swiss-based encrypted email. GPG Public Key - https://api.protonmail.ch/pks/lookup?op=get&search=markjac...@protonmail.com ------- Original Message ------- On Friday, September 1st, 2023 at 12:11 PM, Tony Harminc <t...@harminc.net> wrote: > 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 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
