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Status Planned for future release
Workspace z/TPF Product Family
Categories z/TPF
Created by Guest
Created on Aug 5, 2016

RELATED IDEAS

ECB Heap Statistics

We found a way to get ECB Heap statistics from the ECB Heap Control Table (EHTC). This requires minor changes to CLHH (CCSTOR) and CMALOC (CTIS). We would like the lab to consider adopting this change.

At exit time, looping through EHCT Entries, we accumulate buffer sizes to obtain the amount of 31bit and 64bit heap the ECB needed to satisfy user requests. We do not include the buffer size of the entry that represents the remaining portion of a 1mb frame that was not utilized, distinguished by a user request size of 0. A request size of 0 is lost when buffers are coalesced. So we patch CLHH to not coalesce buffers that have a user request size of 0.

Also looping through EHCT Entries, we accumulate user requested sizes to obtain the amount of 31bit and 64bit heap the application requested. When buffers are coalesced, the buffer sizes are combined but the user requested size of one of the buffers is lost. We patch CCSTOR to combine user requested sizes when buffers are coalesced. We also patch CLHH and CMALOC to split user requested sizes when buffers are split.

The attached power point file illustrates what we are doing.

Idea priority Medium
  • Guest
    Reply
    |     Aug 5, 2016

    Attachment (Description): Enhanced ECB Heap Statistics

    ECB Heap Statis...
    ECB Heap Statistics IBM.pptx
    Open full size
    ECB Heap Statistics IBM.pptx

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