Another place to look is at the Service Class definition that your Zowe tasks fall into. There is a fairly new Service Class parameter(z/OS 2.4?) called 'Honor Priority' which can take one of two values: DEFAULT which means that it takes the setting from IEAOPTxx( IIPHONORPRIORITY=YES in your case) or NO which means do not consume GCP cycles if your ZIIPs are saturated
On Tue, 4 Feb 2025 at 09:31, Sebastian Welton < [email protected]> wrote: > This actually came up in a Watson & Walker Tuning Newsletter some time ago > and basically there is a special aspect of the workload manager (WLM) > service class goal of “discretionary.” If a zIIP exists and the workload is > zIIP-eligible and in a discretionary service period, the workload is > dispatched only on zIIP processors even if CPs are idle. For example, if > you are running z/OSMF with your zPDT system that has 3 CPs, you see a > specific period for z/OSMF start. Then, if you add a zIIP, the z/OSMF start > takes much longer because much of z/OSMF is dispatched only to the single > zIIP processor. This situation occurs for any application that has large > amounts of zIIP-eligible code. > > Sebastian. > > On Mon, 3 Feb 2025 16:21:06 +1100, Attila Fogarasi <[email protected]> > wrote: > > >The obvious explanation is that your zowe workload doesn't have more > active > >threads than zIIPs most of the time. Note that not all of zowe is zIIP > >eligible, most of the CLI and APIML are zIIP eligible. Much of the CLI is > >single threaded per client and sounds like you have few clients for zowe. > >As an aside, on zPDT its probably faster to run with no zIIP as the > >emulation gives no advantage to zIIP and just pollutes the x86 cache. > > > >On Wed, Jan 29, 2025 at 12:31 AM Colin Paice < > >[email protected]> wrote: > > > >> I am running Zowe on my zPDT system. > >> > >> The ZIIPS are running flat out ( with waits for ZIIPS) but the GCPs are > >> pretty idle. > >> > >> Ive IIPHONORPRIORITY=YES which says use GCP if shortage of ZIIP. > >> > >> Is there anything else I should be looking at? > >> > >> Colin > >> > >> ---------------------------------------------------------------------- > >> For IBM-MAIN subscribe / signoff / archive access instructions, > >> send email to [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 > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > -- Mike Shorkend [email protected] Tel: +972524208743 <https://www.linkedin.com/in/MikeShorkend/> <https://twitter.com/mikeShorkend> ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
