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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

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