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https://issues.apache.org/jira/browse/COUCHDB-3307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15888923#comment-15888923
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ASF GitHub Bot commented on COUCHDB-3307:
-----------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/couchdb-couch/pull/230
> Limit calls to maybe_add_sys_db_callbacks to once per db open
> -------------------------------------------------------------
>
> Key: COUCHDB-3307
> URL: https://issues.apache.org/jira/browse/COUCHDB-3307
> Project: CouchDB
> Issue Type: Bug
> Components: Database Core
> Reporter: Bala Kolla
>
> As part of performance regression testing we found out that there was a code
> change in
> {{couch_server:open/2,}}
> {{Options = maybe_add_sys_db_callbacks(DbName, Options0)}}
> and as a result of that change, we are basically calling
> {{maybe_add_sys_db_callbacks}} for each request instead of once per db open.
> We have tested a fix to ensure that we call {{maybe_add_sys_db_callbacks}}
> only once per db open. And executed a GET performance benchmark and found the
> following improvements.
> * Throughput: Up to ~5% improvement.
> * Up to ~22% improvement in p90 and p99 latencies
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