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-bd90-2ebecf271...@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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