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From "Filipe Manana (JIRA)" <j...@apache.org>
Subject [jira] [Created] (COUCHDB-1218) Better logger performance
Date Tue, 12 Jul 2011 16:35:00 GMT
Better logger performance
-------------------------

                 Key: COUCHDB-1218
                 URL: https://issues.apache.org/jira/browse/COUCHDB-1218
             Project: CouchDB
          Issue Type: Improvement
            Reporter: Filipe Manana
            Assignee: Filipe Manana
         Attachments: 0001-Better-logger-performance.patch

I made some experiments with OTP's disk_log module (available since 2001 at least) to use
it to manage the log file.
It turns out I got better throughput by using it. Basically it adopts a strategy similar to
the asynchronous couch_file Damien described in this thread:

http://mail-archives.apache.org/mod_mbox/couchdb-dev/201106.mbox/%3C5C39FB5A-0ACA-4FF9-BD90-2EBECF271850@apache.org%3E

Here's a benchmark with relaximation, 50 writers, 100 readers, documents of 1Kb, delayed_commits
set to false and 'info' log level (default):

http://graphs.mikeal.couchone.com/#/graph/9e19f6d9eeb318c70cabcf67bc013c7f

The reads got a better throughput (bottom graph, easier to visualize).

The patch (also attached here), which has a descriptive comment, is at:

https://github.com/fdmanana/couchdb/compare/logger_perf.patch



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