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https://issues.apache.org/jira/browse/COUCHDB-1054?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12990007#comment-12990007
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Sebastian Cohnen commented on COUCHDB-1054:
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Although I don't exactly know what Filipe improved here, this is not about the 
memory consumption problems with logging on debug e.g., right?

> Better couch_log performance
> ----------------------------
>
>                 Key: COUCHDB-1054
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1054
>             Project: CouchDB
>          Issue Type: Improvement
>            Reporter: Filipe Manana
>            Assignee: Filipe Manana
>         Attachments: COUCHDB-1054-2.patch, COUCHDB-1054-3.patch, 
> COUCHDB-1054.patch
>
>
> Building the messages to write to the console and the log file can be done 
> outside the couch_log gen_event. This significantly increases the parallelism 
> when many processes log messages. The following relaximation test graph shows 
> a throughput increase using the attached patch against current trunk:
> http://graphs.mikeal.couchone.com/#/graph/0379dbdaef29b1c0fbf03421540243f7

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