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From "Adam Kocoloski (JIRA)" <>
Subject [jira] Created: (COUCHDB-316) statistics(runtime) doesn't do what we think it does
Date Thu, 02 Apr 2009 13:40:12 GMT
statistics(runtime) doesn't do what we think it does

                 Key: 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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