[jira] Closed: (COUCHDB-316) statistics(runtime) doesn't do what we think it does

["Adam Kocoloski (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/COUCHDB-316?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Adam Kocoloski closed COUCHDB-316.
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> statistics(runtime) doesn't do what we think it does
> ----------------------------------------------------
>
>                 Key: COUCHDB-316
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-316
>             Project: CouchDB
>          Issue Type: Bug
>          Components: Database Core
>            Reporter: Adam Kocoloski
>
> I was looking at the runtime statistics and finding that {couchdb, request_time} was reporting values that seemed to be too small.  On further investigation I'm fairly certain that the delta returned by statistics(runtime) is the time since that function was last called in *any* process.  That's not at all what we want -- in a highly concurrent system the values reported actually converge to zero!
> We could replace it with timer:now_diff.  That'll be a measure of wallclock time, not CPU, but I think wallclock may be the better metric anyway.

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