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https://issues.apache.org/jira/browse/COUCHDB-976?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12967218#action_12967218
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Adam Kocoloski commented on COUCHDB-976:
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Hi Filipe, I can't see gains of the magnitude you describe in this ticket on
those graphs. A 100ms improvement in reader response time for small docs? I
just don't see it.
Nevertheless, the patch is a good idea.
> Improve database read and write performance using 2 couch_files
> ---------------------------------------------------------------
>
> Key: COUCHDB-976
> URL: https://issues.apache.org/jira/browse/COUCHDB-976
> Project: CouchDB
> Issue Type: Improvement
> Reporter: Filipe Manana
> Assignee: Filipe Manana
>
> Right now we use a single couch_file server for both updating a database and
> reading from a database.
> This is a contention point, as concurrent read/write access to a database
> implies having processes waiting for access to the couch_file server.
> The following patches add a couch_file server that is used only by the DB
> updater process and another couch_file meant to be used by anyone else only
> for read operations:
> https://github.com/fdmanana/couchdb/compare/updater_dedicated_fd
> Some performance measurements:
> # updater_fd vs trunk (small docs, 1Kb each)
> $ node tests/compare_write_and_read.js --wclients 50 --rclients 200 \
> -name1 updater_fd_small_docs -name2 trunk \
> -url1 http://localhost:5984/ -url2 http://localhost:5985/ \
> --duration 300
> http://graphs.mikeal.couchone.com/#/graph/5c859b3e7d1b9bd0488cfe271104a616
> # updater_fd vs trunk (large docs, 100Kb each)
> $ node tests/compare_write_and_read.js --wclients 50 --rclients 200 \
> -name1 updater_fd_large_docs -name2 trunk \
> -url1 http://localhost:5984/ -url2 http://localhost:5985/ \
> --duration 300 --doc large
> http://graphs.mikeal.couchone.com/#/graph/5c859b3e7d1b9bd0488cfe271104a7a7
> We can see that both the response time and throughput gets significantly
> better for both read and writes.
> If no objections I'll commit it to trunk.
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