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Status Under review
Workspace z/TPF Product Family
Categories z/TPF
Created by Guest
Created on Jun 26, 2024

RELATED IDEAS

Optimize tagged heap lookup service routine.

Currently tpf_eheap_tag() and tpf_eheap_locate() are convenient APIs to retrieve heap buffer addresses across an ECB's lifetime. The tpf_eheap_locate() service routine in the CP executes a sequential search through all heap buffers until the provided tag is found. We have seen a trend in our applications code where tagged heap is being more widely adopted despite recommendations to avoid the mechanism unless absolutely necessary. This trend is becoming more of a concern as we have seen noticeable CPU increases on our PROD systems that can be attributed to increased hits in CCSTOR (tagged heap lookup routines specifically). Assuming this trend continues and efforts to move away from the mechanism are not fruitful, ideally the sequential search should be optimized to mitigate the overhead associated with the search.

Idea priority Medium

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