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
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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