Prior to those functions being zIIP-eligible they equally depended upon access to CPU. Yet there's an unfortunately limited amount of calls for running GCPs less busy, which would also be good for performance overall.
It's also worth noting that not all Db2 subsystems are production and don't need production levels of performance. But I agree that many environments would benefits from more zIIPs. Almost as many would benefit from more GCPs as well, but that's usually even more difficult to do because of the way software pricing works on the mainframe and the fact that it's often more than the hardware cost. And the z16 A02 machines remain limited to only allowing 6 GCPs. Which is a shame: I was just working with a customer whose environment cries out for more than 6 CPs and and a processor capacity setting that's between the A01 5xx and 6xx. Their situation was particularly problematic, but they're not the only ones that could benefit from more than 6 CPs that could be finely adjusted in terms of capacity. Scott Chapman On Wed, 6 Sep 2023 09:52:47 +0000, Martin Packer <martin_pac...@uk.ibm.com> wrote: >I really hope you�re not advising customers to run the zIIP pool at 100%. Key >functions such as Db2 DBM1 Deferred Write and Prefetch, as well as Db2 Log >Writes, depend on very good access to zIIP. > >(This is actually why I first wrote my zIIP Capacity & Performance >presentation 10 years ago.) ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
