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Posted to issues@kudu.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2018/03/22 02:50:00 UTC

[jira] [Assigned] (KUDU-972) cache should track memory overhead

     [ https://issues.apache.org/jira/browse/KUDU-972?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Lipcon reassigned KUDU-972:
--------------------------------

    Assignee: Todd Lipcon

> cache should track memory overhead
> ----------------------------------
>
>                 Key: KUDU-972
>                 URL: https://issues.apache.org/jira/browse/KUDU-972
>             Project: Kudu
>          Issue Type: Bug
>          Components: cfile, util
>    Affects Versions: Private Beta
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Major
>
> Currently the cache only accounts for the cache _values_ in the memtracker. Each key seems to have 88 or so bytes of memory usage as well (potentially rounded up due to allocation overhead, etc).
> For the DRAM cache, this is still a ~700:1 ratio assuming 64kb block sizes, but for PMEM, where we expect hundreds of GBs of block cache, a 700:1 ratio may turn out to be somewhat substantial.



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