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Status Not under consideration
Workspace z/OS
Categories BCP_WLM
Created by Guest
Created on Sep 12, 2025

RELATED IDEAS

Default values of IEAOPT CCIMP, CCIMPBOOST parms should be 0

We would like to control the way the cpu protection is assigned to a workload using WLM instead of IEOPT CCIMP, CCIMPBOOST parms. These parameters assign implicitly the cpu critical to the whole importance 1 or 2 workloads. For customers that have explicitly (through WLM) defined cpu critical to specific service classes it is more beneficial the default value of ccimp, ccimpboost to be 0. The proposed default value provides better transition of system behavior after z/os upgrade to v2.5 or higher.

Idea priority High
  • Guest
    Oct 24, 2025
    The default settings in IEAOPT reflect the IBM recommended values for the parameters CCIMP and CCIMPBOOST. They have been selected specifically to protect the most valuable and critical workloads, and to simplify the setup of an WLM policy for most users. Another advantage of the CCIMP parameters is that they also apply to the first period of multi-period service classes, whereas manually defining CPU critical in the WLM service definition is only possible for single-period service classes.
    As you have correctly observed, setting the parameter value to zero would disable this feature and keep the CPU-critical definitions you specified in your WLM service definition.
    Reply

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