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From "Filipe Manana (JIRA)" <j...@apache.org>
Subject [jira] Created: (COUCHDB-980) Micro optimization to couch_file
Date Wed, 08 Dec 2010 15:02:00 GMT
Micro optimization to couch_file
--------------------------------

                 Key: COUCHDB-980
                 URL: https://issues.apache.org/jira/browse/COUCHDB-980
             Project: CouchDB
          Issue Type: Improvement
          Components: Database Core
            Reporter: Filipe Manana
            Assignee: Filipe Manana


The following short patch moves the MD5 verification outside the couch_file server:

https://github.com/fdmanana/couchdb/commit/51c463d682c478dcb273bd88f1ef3046a709689f

Despite being apparently so insignificant (couch_util:md5/1 takes about 700us in my machine),
I get this significant results with relaximation:

$ node tests/compare_write_and_read.js --wclients 100 --rclients 200 \
  -name1 md5_out -name2 trunk \
  -url1 http://localhost:5984/ -url2 http://localhost:5985/ \
  --duration 120


run 1)  http://graphs.mikeal.couchone.com/#/graph/5c859b3e7d1b9bd0488cfe271105130c

run 2)  http://graphs.mikeal.couchone.com/#/graph/5c859b3e7d1b9bd0488cfe2711051bba


The documents used in the test have a size of about 1Kb.
If nobody has an objection, I'll commit this to trunk.

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