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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2787) disable atime for DirectIOLinuxDirectory
Date Wed, 01 Dec 2010 14:46:13 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12965700#action_12965700
] 

Robert Muir commented on LUCENE-2787:
-------------------------------------

Also simon, i just wanted to say, you need to be root to change the mount option etc.

I think this is totally appropriate for us to do, again quoting from the page:

"This flag is intended for use by *indexing* or backup programs, where its use can significantly
reduce the amount of disk activity."



> disable atime for DirectIOLinuxDirectory
> ----------------------------------------
>
>                 Key: LUCENE-2787
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2787
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: contrib/*
>            Reporter: Robert Muir
>             Fix For: 3.1, 4.0
>
>         Attachments: LUCENE-2787.patch
>
>
> In Linux's open():
> O_NOATIME
>     (Since Linux 2.6.8) Do not update the file last access time (st_atime in the inode)
when the file is read(2). This flag is intended for use by indexing or backup programs, where
its use can significantly reduce the amount of disk activity. This flag may not be effective
on all filesystems. One example is NFS, where the server maintains the access time.
> So we should do this in our linux-specific DirectIOLinuxDirectory.
> Separately (offtopic), it would be better if this was a LinuxDirectory that only uses
O_DIRECT when it should :)
> It would be nice to think about an optional modules/native for common platforms similar
to what tomcat provides
> Its easier to test directories like this now (-Dtests.directory)...

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