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https://issues.apache.org/jira/browse/YARN-1775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13942581#comment-13942581
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Colin Patrick McCabe commented on YARN-1775:
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Thanks for tackling this.
In {{isSmapEnabled}}, I think it's typical to cache the result of
{{conf.getBoolean}}. That avoids doing the hash table lookup all the time.
It seems like the method used here is to exclude shared read-only mappings from
the total RSS. It might be nice to explain that in {{yarn-default.xml}}.
Also, I wonder if we could make this default to true and simply disable it when
{{/proc/<PID>/smaps}} is not present or writable.
> Create SMAPBasedProcessTree to get PSS information
> --------------------------------------------------
>
> Key: YARN-1775
> URL: https://issues.apache.org/jira/browse/YARN-1775
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: nodemanager
> Reporter: Rajesh Balamohan
> Assignee: Rajesh Balamohan
> Attachments: YARN-1775-v2.patch, YARN-1775-v3.patch,
> yarn-1775-2.4.0.patch
>
>
> Create SMAPBasedProcessTree (by extending ProcfsBasedProcessTree), which will
> make use of PSS for computing the memory usage.
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