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https://issues.apache.org/jira/browse/COUCHDB-2097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13910535#comment-13910535
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Paul Joseph Davis commented on COUCHDB-2097:
--------------------------------------------
Just checked and it looks like the majority of the performance analysis has
been reported here:
https://gist.github.com/mikewallace1979/8ed91d91443f9d1ee828
Mike's general conclusions:
The `couch_file` and `couch_server` optimizations provide faster reads under
concurrent read/write load than the original multiple fd optimization in
`couch_db_updater` for large and small documents. Writes are slower than with
the multiple fd optimization however they are significantly faster than when
using a single updater fd with no optimizations.
I'll also attach the entire long form analysis to this ticket so we have a copy
for posterity.
> Avoid performance regression with a single fd
> ---------------------------------------------
>
> Key: COUCHDB-2097
> URL: https://issues.apache.org/jira/browse/COUCHDB-2097
> Project: CouchDB
> Issue Type: Improvement
> Security Level: public(Regular issues)
> Components: BigCouch
> Reporter: Paul Joseph Davis
> Labels: release
>
> Part of one of our large enhancements required that we remove a CouchDB
> performance optimization on having two file handles to each .couch file. We
> need to make sure that this doesn't negatively impact performance.
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