Re: z13s with single CPU able to use SMT?
As Parwez correctly pointed out, z/OS's SMT 2 is limited to zIIPs. Since you cannot have an LPAR with only a zIIP (you could not IPL it), you therefore cannot have an LPAR with only a single CPU running z/OS that is able to use SMT. You could write your own operating system that allows that. The doc does not suggest otherwise. The values allowed are shown: MT_CP_MODE=1 MT_ZIIP_MODE=1|2 Peter Relson z/OS Core Technology Design -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: z13s with single CPU able to use SMT?
I think this was his response to CPs not supporting SMT Regards Parwez Hamid From: IBM Mainframe Discussion List on behalf of Elardus Engelbrecht Sent: 28 June 2019 11:14 To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: z13s with single CPU able to use SMT? Brian Westerman wrote: >Bummer About what do you say "bummer"? TIA! Groete / Greetings Elardus Engelbrecht -- 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
Re: z13s with single CPU able to use SMT?
Brian Westerman wrote: >Bummer About what do you say "bummer"? TIA! Groete / Greetings Elardus Engelbrecht -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: z13s with single CPU able to use SMT?
Agreed Gadi From: IBM Mainframe Discussion List on behalf of Brian Westerman Sent: Friday, June 28, 2019 09:44 To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: z13s with single CPU able to use SMT? Bummer Brian -- 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
Re: z13s with single CPU able to use SMT?
Bummer Brian -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: z13s with single CPU able to use SMT?
SMT is only supported for zIIPs, IFLs and SAPs. –z13(s) allows following engine types to run in SMT mode •zIIPs under z/OS •IFLs under z/VM Regards Parwez Hamid From: IBM Mainframe Discussion List on behalf of Brian Westerman Sent: 27 June 2019 08:18 To: IBM-MAIN@LISTSERV.UA.EDU Subject: z13s with single CPU able to use SMT? Hi, one of our boxes is a z13s (a model N10 with a single CPU), and supposedly if you change LOADxx to add PROCVIEW CORE and add the IEAOPTxx entry of MT_CP_MODE=x, it will open up the use of the SMT thread. If I code MT_CP_MODE=2, it gets an error that the value (2) is not within limits. My "D M=CORE" command shows: IEE174I 23.27.00 DISPLAY M 793 CORE STATUS: HD=Y MT=2 MT_MODE: CP=1 zIIP=1 IDST ID RANGE VP ISCM CPU THREAD STATUS + -0001 M FE00 +N CPC ND = 002965.N10.IBM.02.000CD497 CPC SI = 2965.A01.IBM.02.000CD497 Model: N10 CPC ID = 00 CPC NAME = P00CD497 LP NAME = SBOX LP ID = 3 CSS ID = 0 MIF ID = 3 whereas it used to (before this change) show: D M=CORE IEE174I 22.31.01 DISPLAY M 292 CORE STATUS: HD=Y MT=1 IDST ID RANGE VP ISCM CPU THREAD STATUS + - M FE00 + CPC ND = 002965.N10.IBM.02.000CD497 CPC SI = 2965.A01.IBM.02.000CD497 Model: N10 CPC ID = 00 CPC NAME = P00CD497 LP NAME = SBOX LP ID = 3 CSS ID = 0 MIF ID = 3 So it changed MT=2 and appears to have a ID range changed from - to -0001, so does that mean I now have 2 threads even though the IEAOPTxx setting of MT_CP_MODE=2 fails? How do I tell if I am actually getting the use of two threads instead of one, is there something in RMF that points to this? Thanks in advance, Brian -- 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
Re: z13s with single CPU able to use SMT?
You could try an RMF CPU report, which should show MT information if it is enabled. But the "+N" on your display seems to say the multiple cores are online but not available for use, so you wont be using them. The underlying hardware is telling z/OS "no" I guess. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
