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https://issues.apache.org/jira/browse/COUCHDB-3284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15843539#comment-15843539
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Nick Vatamaniuc commented on COUCHDB-3284:
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Attached performance graphs showing increased IO usage and increased binary
memory usage. Those go away after disabling 8kb read-ahead logic
> 8Kb read-ahead in couch_file causes extra IO and binary memory usage
> --------------------------------------------------------------------
>
> Key: COUCHDB-3284
> URL: https://issues.apache.org/jira/browse/COUCHDB-3284
> Project: CouchDB
> Issue Type: Bug
> Components: Database Core
> Affects Versions: 2.0.0
> Reporter: Nick Vatamaniuc
> Attachments: jira_io_increased.png
>
>
> 8Kb read-ahead logic in couch_file seems to cause extra input IO thrashing,
> binary memory usage but doesn't speed-up
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