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  1. WiredTiger
  2. WT-5125

Adding new stats for eviction target strategy

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Details

    • Task
    • Status: Closed
    • Major - P3
    • Resolution: Fixed
    • None
    • WT10.0.0, 4.2.2, 4.3.2, 4.0.15
    • None
    • None
    • 5
    • Storage Engines 2019-10-21, Storage Engines 2019-11-18
    • v4.0

    Description

      In workloads with almost zero dirty cache usage we can occasionally get into a state where eviction doesn't evict much or anything for a while despite the cache fill ration being >90%. It appears this is related to heuristics around revisiting pages for eviction, as wiredtiger will visit a page for eviction and then skip it up to 5 times following on from that. Additionally the target page ratio isn't high as there isn't dirty content in the cache which means we give up eviction walks quickly.

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              haribabu.kommi@mongodb.com Haribabu Kommi
              luke.pearson@mongodb.com Luke Pearson
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                Created:
                Updated:
                Resolved: