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https://issues.apache.org/jira/browse/IMPALA-9378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17040532#comment-17040532
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Tim Armstrong commented on IMPALA-9378:
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https://gerrit.cloudera.org/#/c/15236/ - IMPALA-9381 should reduce about half
of the time spent in CloseImpalaOperation(), according to the flame graph.
> CPU usage for runtime profiles with multithreading
> --------------------------------------------------
>
> Key: IMPALA-9378
> URL: https://issues.apache.org/jira/browse/IMPALA-9378
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Reporter: Tim Armstrong
> Assignee: Tim Armstrong
> Priority: Major
> Attachments: coord_q5_dop0.svg, coord_q5_dop16.svg
>
>
> [~drorke] reports that significant amounts of time can be spent on the
> runtime profile with higher values of mt_dop. This can impact query
> performance from the client's point of view since profile serialisation is on
> the critical path for closing the query. Also serialising the profile for the
> webserver holds the ClientRequestState's lock, so can block query progress.
> We should figure out how to make this more efficient.
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