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Status Not under consideration
Workspace CICS Transaction Server for z/OS
Categories Runtime
Created by Guest
Created on May 31, 2022

RELATED IDEAS

Guarantee LG_DEFER Waits Do Not Exceed LGDFINT

When two tasks with higher than normal VSAM activity are simultaneously routed to the same target region, there can be extended delays related to LGDFINT. The calculations LGDFINT uses to determine whether to force or defer a log write can be skewed very quickly, causing decisions to be made that are not reflective of normal region activity. When the region is deemed inaccurately busy, the deferred writes now depend on incoming work past the LGDFINT limit. When these regions are CPSM targets, they are avoided due to the long running tasks which compounds the issue. The result is several second LG_DEFER waits in regions with a 2 millisecond LGDFINT value. In this scenario, brief spikes in volume where LGDFINT should be of value actually cause it to be a liability. Improvements should be made as to when LGDFINT is enforced. When it is enforced it should be a guaranteed upper limit. This solution should not have a negative performance impact, as it would be during periods of peak activity when it would be utilized.

Idea priority High
  • Guest
    Reply
    |     Sep 20, 2022
    The word "guarantee" in the RFE title is impossible to achieve. Ultimately we are at the mercy of the z/OS and PR/SM dispatcher to give us CPU when we need it, and therefore we cannot say that a task will *never* exceed LGDFINT.

    Even if we could concoct a way for the CICS dispatcher to put a task on a dispatchable TCB within a specific timeframe, it would assume that TCBs are dispatched as soon as they are POSTed and that will not always be true.

    We have assessed this requirement. We have no current plans for this to be implemented and so this requirement is being declined at this point.

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