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Status Under review
Workspace z/OS
Categories RMF
Created by Guest
Created on Oct 4, 2024

RELATED IDEAS

Separate “Local Lock Suspension Time” from “zIIP on CP Time”

We have been in the process of activating and evaluating SMT-2 across several LPARs.  As part of our analysis and IBM’s analysis (TS015958511), we were made aware that "Local Lock Suspension Time”, which is not eligible to run on a CP, is always a part of “zIIP on CP Time”.  As a result, this makes it difficult to quantify how much of “zIIP on CP Time“ is genuinely eligible to run on the CP.  

 As a request, we would like to see "Local Lock Suspension Time” be reported separate from “zIIP on CP Time”.

Idea priority Low
  • Guest
    Reply
    |     Nov 8, 2024

    1. The fundamental question we are asking is to confirm what IBM Krause from Germany (zIIP SMT1 vs SMT2 SME) mentioned that “Local Lock Suspension” is recorded in zIIP on CP Metric which indicates that that the workload in zIIP on CP is zIIP eligible workloads that can run on the zIIP engines.

    2. However, Krause mentioned that there is an exception that “Local Lock Suspension” although recorded in zIIP on CP is in fact not eligible to run on zIIP engines and can only run on GP.

    3. Fidelity would like confirmation that this understanding is correct.

    4. And if validated and confirmed the understanding above is correct then why is “local lock suspension” recorded and reported in zIIP on CP?

    5. If the above is true then can IBM consider moving local lock suspension out of zIIP on CP reporting as that provides an inaccurate readout on true zIIP eligible workloads overflowing to GP.

    6. Hopefully, this clarifies the reason for this IBM Ticket and appreciate your help on the above questions.

  • Guest
    Reply
    |     Oct 31, 2024
    Local Lock data is reported as part of Postprocessor Serialization Delay (SDELAY) report (XML only, requires SMF 74.5). Please take a look at figure 2/table 2: https://www.ibm.com/docs/en/zos/3.1.0?topic=report-serialization-delay-details . Would this Local Lock data work as an answer for your request?

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