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Status Not under consideration
Workspace IBM Z and LinuxONE Systems Hardware
Categories General/Miscellaneous
Created by Guest
Created on Mar 25, 2025

RELATED IDEAS

Increase SMT Simultaneous multithreading greater than 2

Since several month, we have lot of Rest Api calling DB2 from DDF gateway and DB2 API rest use is increasing. 

These Api Rest are very short and execute on ZIIP. Many years ago, when we activate SMT to 2, we noticed a real benefits for DB2 running application on a remote site and many years ago  there where no API and only short sql request. So, because short DB2 request increased, it can be a good idea to increase SMT greater than 2.

Idea priority Low
  • Guest
    Jan 29, 2026
    We appreciate this request and and glad to hear that you have seen real benefit from the Simutaneous Multi-Threading (SMT) feature introduced on z13.  When we developed SMT for IBM Z/LinuxONE processors, we chose to implement 2 hardware threads (SMT-2) rather than a larger number of threads (e.g. SMT-4) based on a thorough analysis of the relative cost and value of these options.  For a variety of reasons, the marginal benefit (in terms of throughput per core) provided by supporting additional hardware threads diminishes significantly as the thread count increases.  Conversely the marginal cost of SMT-4 over SMT-2 (in terms of hardware circuits, silicon area, and design complexity) is substantial.  Adding support for more hardware threads in future IBM Z/LinuxONE processors would consume development and silicon resources that can more effectively be spent delivering greater value - including increased core performance - for our clients.  Given that, we have no plans to increase the number of hardware threads per core in future IBM Z/LinuxONE processors.
    If you are seeing constraints on the overall zIIP capacity in your systems, you should seriously consider increasing the number of zIIPs.  The firmware and software are designed to make very efficient use of the capacity available in the system.
    If you wish to discuss this further we would be happy to set up a time for that.
    Reply

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