Very true (about MVS and z/OS not limiting address spaces). I recall using CPU affinity back in CMOS days when there were only 1 or 2 CCFs that were physically bound to a given CPU, but that was nearly 2 decades ago now.
Eric Rossman -----Original Message----- From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of Seymour J Metz Sent: Thursday, July 13, 2023 12:07 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: [EXTERNAL] Re: A question about CPU usage on z/OS A task can only use one CPU at a time, but MVS has never limited an address space to a single CPU except for the case of CPU affinity, which I have never seen used. However, many batch jobs do not exploit multitasking and thus cannot exploit multiple CPUs. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
