IBM Z Hardware and Operating Systems Ideas Portal


This is the public portal for all IBM Z Hardware and Operating System related offerings. To view all of your ideas submitted to IBM, create and manage groups of Ideas, or create an idea explicitly set to be either visible by all (public) or visible only to you and IBM (private), use the IBM Unified Ideas Portal (https://ideas.ibm.com).


Shape the future of IBM!

We invite you to shape the future of IBM, including product roadmaps, by submitting ideas that matter to you the most. Here's how it works:

Search existing ideas

Start by searching and reviewing ideas and requests to enhance a product or service. Take a look at ideas others have posted, and add a comment, vote, or subscribe to updates on them if they matter to you. If you can't find what you are looking for,

Post your ideas

  1. Post an idea.

  2. Get feedback from the IBM team and other customers to refine your idea.

  3. Follow the idea through the IBM Ideas process.


Specific links you will want to bookmark for future use

Welcome to the IBM Ideas Portal (https://www.ibm.com/ideas) - Use this site to find out additional information and details about the IBM Ideas process and statuses.

IBM Unified Ideas Portal (https://ideas.ibm.com) - Use this site to view all of your ideas, create new ideas for any IBM product, or search for ideas across all of IBM.

ideasibm@us.ibm.com - Use this email to suggest enhancements to the Ideas process or request help from IBM for submitting your Ideas.

Add a new idea Subscribe
Status Not under consideration
Workspace z/OS
Categories BCP_Supervisor
Created by Guest
Created on Sep 23, 2024

RELATED IDEAS

VLF SMF 41 SUBTYPE 3 - MISSING COFPURGE statistics

Currently VLF statistics tracks ADD, DELETES, TRIM activity.

One of the most important activity in terms of VLF CPU usage is the PURGE activity (COFPURGE). SMF 41 should track also COFPURGE.

The purge activity consumes when the cache has many entries ( 100.000 or more ),

so could be great to track also the size of largest cache purged in the SMF interval.

Thanks.

Idea priority Medium
  • Guest
    Reply
    |     Oct 8, 2024

    In recent IBM case TS017126436 support mentioned the purge activity as a CPU driver for VLF. Using CATALOG display command we see some relation with high VLF activity and the increased purge number of a VLF catalog with more of 1 million entries. If you confirm that PURGE activity CPU is not proportional to size of purged cache I will reopen the case. Thanks for support,

  • Guest
    Reply
    |     Oct 2, 2024
    We disagree that "One of the most important activity in terms of VLF CPU usage is the PURGE activity". VLF purge processing's CPU time is not proportional to the amount of data cached or to the number of objects cached. It would be possible to track the number of purges done across all VLF classes in an SMF interval and surface that in an SMF record, but such a code change would have limited value and be unlikely to be given high enough priority to be placed into the product plan

By clicking the "Post Comment" or "Submit Idea" button, you are agreeing to the IBM Ideas Portal Terms of Use.
Do not place IBM confidential, company confidential, or personal information into any field.