I want to think that the wait completion option was drop from z/OS so if you are running say z/OS 3.1 I don't think that should be an issue. Please someone correct me if I'm wrong.
I think you could use the SYSP panel in SDSF to display what parms got used at IPL time. I would verify that you actually used IEAOPT00. I would have thought that you should have seen some type of IWM message (good or bad) at IPL time. Before I retired, I helped setup the use of SHOWMVS (SHOWzOS) during the IPL process. I think the process was to run the program (started task) from automation as a last step during the IPL process. The output was put into a dataset (GDG) so we had a record of what was done during the IPL. We kept “X” generations depending on how frequently an lpar was IPLed. Paul -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Jay Maynard Sent: Monday, February 2, 2026 12:38 PM To: [email protected] Subject: Re: MT_ZIIP_MODE=2 at IPL? Nope, no IWM067I messages at all. I do have HIPERDISPATCH enabled. What's WAITCOMPLETION? On Mon, Feb 2, 2026 at 11:40 AM allan winston < [email protected] <mailto:[email protected]> > wrote: > By any chance is the IWM067I message being displayed? > > Some reasons that the mode 2 is not being honored, per that message, are: > HIPERDISPATCH FUNCTION IS NOT ACTIVE > WAITCOMPLETION=YES IS SET > > Allan Winston > > > On Mon, Feb 2, 2026 at 9:33 AM Jay Maynard < > [email protected] <mailto:[email protected]> > wrote: > > > We've enabled MT_ZIIP_MODE=2 on our systems. At yesterday morning's > > production LPAR IPL, I expected it to take effect; it's in IEAOPT00, > > with PROCVIEW=CORE in LOADxx. > > > > Instead, we had the zIIP multithreading mode equal to 1 after the > > IPL, according to D M=CPU. Issuing SET OPT=00 changed the mode > > without having > to > > do anything else. > > > > Am I missing something? > > -- > > Jay Maynard > > > > -------------------------------------------------------------------- > > -- For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to [email protected] <mailto:[email protected]> with the message: INFO > > IBM-MAIN > > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, send > email to [email protected] <mailto:[email protected]> with the message: INFO IBM-MAIN > -- Jay Maynard ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] <mailto:[email protected]> with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
