lucene-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Simon Willnauer (JIRA)" <>
Subject [jira] Commented: (LUCENE-2787) disable atime for DirectIOLinuxDirectory
Date Wed, 01 Dec 2010 17:29:14 GMT


Simon Willnauer commented on LUCENE-2787:

after all i think we should really do it. I can not think of any situation where you want
atime to be updated here. It seems that lots of distributions use relatime which is smarter
about it see:

we should really document that on the wiki so that folks can check what their dist does or
by default set it to noatime.


> disable atime for DirectIOLinuxDirectory
> ----------------------------------------
>                 Key: LUCENE-2787
>                 URL:
>             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():
>     (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 (

This message is automatically generated by JIRA.
You can reply to this email to add a comment to the issue online.

To unsubscribe, e-mail:
For additional commands, e-mail:

View raw message