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From "Varun Thacker (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3178) Native MMapDir
Date Wed, 31 Aug 2011 18:06:11 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13094733#comment-13094733
] 

Varun Thacker commented on LUCENE-3178:
---------------------------------------

Can we use the NativePosixUtil class and call the posix_madvise/madvise methods?
NMapDir#openInput() and NMapDir#createSlicer takes a IOContext. I'm not quite sure what createSlicer
does though?

> Native MMapDir
> --------------
>
>                 Key: LUCENE-3178
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3178
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: core/store
>            Reporter: Michael McCandless
>
> Spinoff from LUCENE-2793.
> Just like we will create native Dir impl (UnixDirectory) to pass the right OS level IO
flags depending on the IOContext, we could in theory do something similar with MMapDir.
> The problem is MMap is apparently quite hairy... and to pass the flags the native code
would need to invoke mmap (I think?), unlike UnixDir where the code "only" has to open the
file handle.

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