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Status Delivered
Categories Runtime
Created by Guest
Created on Jul 29, 2021

Enhance EXPIRY processing TS-queues performance

You can use a TSMODEL to set an EXPIRY on a TS-queue.
If you install such a TSMODEL in CICS, then CICS will initiate a SCAN process, that will scan main/auxilary and CF-TS-Pools for queues that has expired.
This scan process will run in all cics regions that have a TSMODEL with an EXPIRY specified.
The scan will run with an interval of 1/10 of the lowest EXPIRY interval.
For example, if you have two TSMODEL, one with EXPIRY=10(minutes) and one with EXPIRY=30(minutes), then the scan process will run every 1 minute in each cics region that have the TSMODEL installed.
Even when the TSMODEL specifies no POOL (local queues) both MAIN/AUXILARY and all CF-TS-POOLS are scanned every minute.

No SMF110 records is written for the process that does the scans for expired TS-queues. The increase of CPU-usage is only seen in the SMF30 records.

The performance impact of having many cicses (in our case 190+) scan all the CFs are so massive, that the way these scans are done should be changed in order to mitigate the performance impact.



We suggest the following changes:

1) For TSMODELs without a POOL, the scan process should only scan locally in main/auxiliary and use the PREFIX to qualify the scan.

2) For TSMODELS with a POOL, the scan process should scan only that POOL and use the PREFIX to qualify the scan.

CICS should coordinate between regions connected to a specific pool in order to only do the scan from one region.

3) The INTERVAL of scans should be customisable in the TSMODEL.

4) The scans should run under a CICS system transaction that will write SMF110. So we are able to track the resource usage of these scans.

Idea priority Medium
  • Guest
    Reply
    |
    Jun 17, 2022
    Support for this is provided in CICS TS 6.1 which is generally available from 17th June 2022.

    For more information see https://www.ibm.com/docs/en/cics-ts/6.1?topic=whats-new
  • Guest
    Reply
    |
    Apr 5, 2022
    Support for this is provided in CICS TS 6.1 which is announced today April 5th and will GA June 17th 2022.

    See Announcement letter https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/2/897/ENUS222-092/index.html&request_locale=en
  • Guest
    Reply
    |
    Aug 26, 2021

    This is something we would like to address. The RFE is being moved into 'Planned for Future release' status. Please note:
    IBM’s statements regarding its plans, directions, and intent are subject to change or withdrawal without notice at IBM’s sole discretion. Information regarding potential future products is intended to outline our general product direction and it should not be relied on in making a purchasing decision. The information mentioned regarding potential future products is not a commitment, promise, or legal obligation to deliver any material, code or functionality. Information about potential future products may not be incorporated into any contract. The development, release, and timing of any future features or functionality described for our products remains at our sole discretion.