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From "Filipe Manana (JIRA)" <>
Subject [jira] Commented: (COUCHDB-1054) Better couch_log performance
Date Wed, 02 Feb 2011 18:53:29 GMT


Filipe Manana commented on COUCHDB-1054:

Yes, the addition of the timestamp is not externalized to avoid having strange logs, with
later timestamps coming before earlier ones. If externalized, it would likely confuse many
users. However I don't mind at all about it.

Is everyone ok with this?

At some point I had the message converted to a binary with an iolist_to_binary call, it's
certainly difficult to measure the impact, but I'm not sure what is more expensive: converting
to a binary or copying an iolist.
I didn't know about io:put_chars, but it seems to accept binaries and iolists besides charlists
(the docs only mention charlists). I'll definitely use it.

> Better couch_log performance
> ----------------------------
>                 Key: COUCHDB-1054
>                 URL:
>             Project: CouchDB
>          Issue Type: Improvement
>            Reporter: Filipe Manana
>            Assignee: Filipe Manana
>         Attachments: COUCHDB-1054-2.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:

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