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Posted to notifications@couchdb.apache.org by "Nick Vatamaniuc (JIRA)" <ji...@apache.org> on 2017/01/27 21:47:24 UTC

[jira] [Commented] (COUCHDB-3284) 8Kb read-ahead in couch_file causes extra IO and binary memory usage

    [ https://issues.apache.org/jira/browse/COUCHDB-3284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15843539#comment-15843539 ] 

Nick Vatamaniuc commented on COUCHDB-3284:
------------------------------------------

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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