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Status Not under consideration
Workspace z/TPF Product Family
Categories z/TPF
Created by Guest
Created on Sep 19, 2017

RELATED IDEAS

Report ECB heap control table statistics

The initial ECB heap control table (IEHCT) allows each ECB to reference 151 heap nodes, more than this requires the ECB to get system heap to extend its IEHCT.
As PJ44907 highlights, this process can cause a bottleneck on the system heap lock and depletes system heap by 32,768 bytes per extension.
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This RFE is to request greater visibility on the IEHCT size so that the user is aware when a specific application is close to this threshold.
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The fields of interest are:
1) CLHH_EXT_CNT in CCSTOR which is the system wide count of ECBs that extended their IEHCT size.
2) IEHCT_ENTRIES_TOT which is the count of IECHT items from the ECBs own IEHCT header.

Idea priority Medium
  • Guest
    Reply
    |     Dec 12, 2017

    This information is available with owner name collection (ZMOWN) and resource usage by named limit set collection (ZECBM COLLECT). IBM does not intend to implement this in other functions in the foreseeable future.

    Visibility to fields IEHCT_ENTRIES_TOT and IEHCT_BUF_OBTAINED already exists. These fields are reported in resource usage by owner name collection (ZMOWN) and resource usage by named limit set collection (ZECBM COLLECT). Field IEHCT_ENTRIES_TOT is reported in column titled: "The number of ECB heap control entries that were obtained in the time period." Field IEHCT_BUF_OBTAINED is reported in column titled: "The number of ECB heap buffers that were obtained in the time period." In addition, name value pair collection will report both of these fields.

    Visibility to CLHH_EXT_CNT will be able to be determined. CLHH_EXT_CNT in CCSTOR is used to count the number of ECBs that have their ECB heap hash table resized. When an ECB uses 970 ECB heap control table entries, the hash is resized. Because name value pair collection will report the number of ECB heap control table entries (IEHCT_ENTRIES_TOT), ECBs that need to resize their hash table can be calculated. Any time that IEHCT_ENTRIES_TOT is 970 or higher, the hash table has been resized.

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