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https://issues.apache.org/jira/browse/SOLR-6275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14076750#comment-14076750
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Mark Miller commented on SOLR-6275:
-----------------------------------
But yeah, I'm not really worried about the single cost call difference. I just
have a faint memory reading that it's the concurrent calls to nanotime that
will kill you.
> Improve accuracy of QTime reporting
> -----------------------------------
>
> Key: SOLR-6275
> URL: https://issues.apache.org/jira/browse/SOLR-6275
> Project: Solr
> Issue Type: Improvement
> Components: search
> Reporter: Ramkumar Aiyengar
> Priority: Minor
>
> Currently, {{QTime}} uses {{currentTimeMillis}} instead of {{nanoTime}} and
> hence is not suitable for time measurements. Further, it is really started
> after all the dispatch logic in {{SolrDispatchFilter}} (same with the top
> level timing reported by {{debug=timing}}) which may or may not be expensive,
> and hence may not fully represent the time taken by the search. This is to
> remedy both cases.
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