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Date: Wed, 16 Jun 2010 05:30:23 -0400 (EDT)
From: "Michael McCandless (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-2056) Should NIOFSDir use direct
 ByteBuffers?
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    [ https://issues.apache.org/jira/browse/LUCENE-2056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12879290#action_12879290 ] 

Michael McCandless commented on LUCENE-2056:
--------------------------------------------

Thanks Steven!  Was this with the above alg (ie, 4 threads doing searching)?

Could you also try the search using NIOFSDirectory?

Also, if possible, it'd be better to test against a larger index -- such super-fast queries allow the query init cost to unduly impact that results (eg, allocating a direct buffer is more costly than allocating a non-direct buffer).

> Should NIOFSDir use direct ByteBuffers?
> ---------------------------------------
>
>                 Key: LUCENE-2056
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2056
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Store
>            Reporter: Michael McCandless
>            Priority: Minor
>         Attachments: LUCENE-2056.patch
>
>
> I'm trying to test NRT performance, and noticed when I dump the thread stacks that the darned threads often seem to be in {{java.nio.Bits.copyToByteArray(Native Method)}}... so I wondered whether we could/should use direct ByteBuffers, and whether that would gain performance in general.  We currently just use our own byte[] buffer via BufferedIndexInput.
> It's hard to test since it's likely platform specific, but if it does result in gains it could be an easy win.

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