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https://issues.apache.org/jira/browse/LUCENE-2500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12972855#action_12972855
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Jason Rutherglen commented on LUCENE-2500:
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DirectIOLinuxDirectory is in trunk and works? Are we using it with segment
merging yet? Perhaps a separate Jira issue?
> A Linux-specific Directory impl that bypasses the buffer cache
> --------------------------------------------------------------
>
> Key: LUCENE-2500
> URL: https://issues.apache.org/jira/browse/LUCENE-2500
> Project: Lucene - Java
> Issue Type: Improvement
> Components: contrib/*
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 3.1, 4.0
>
> Attachments: LUCENE-2500.patch
>
>
> I've been testing how we could prevent Lucene's merges from evicting
> pages from the OS's buffer cache. I tried fadvise/madvise (via JNI)
> but (frustratingly), I could not get them to work (details at
> http://chbits.blogspot.com/2010/06/lucene-and-fadvisemadvise.html).
> The only thing that worked was to use Linux's O_DIRECT flag, which
> forces all IO to bypass the buffer cache entirely... so I created a
> Linux-specific Directory impl to do this.
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