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Date: Fri, 17 Sep 2010 13:56:33 -0400 (EDT)
From: "Robert Muir (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Subject: [jira] Updated: (LUCENE-2650) improve windows defaults in
 FSDirectory
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     [ https://issues.apache.org/jira/browse/LUCENE-2650?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Muir updated LUCENE-2650:
--------------------------------

    Attachment: LUCENE-2650.patch

Here's the patch:
* sets the defaults as described in the issue
* turns on unmap by default if its possible
* when unmapping inputs, we should be careful to never allow the region to be accessed.
 so in close(), we ensure that clones, too set their buffer to null.
 and in clone() we add a friendlier exception rather than NPE.


> improve windows defaults in FSDirectory
> ---------------------------------------
>
>                 Key: LUCENE-2650
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2650
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Store
>    Affects Versions: 4.0
>            Reporter: Robert Muir
>            Assignee: Robert Muir
>             Fix For: 4.0
>
>         Attachments: LUCENE-2650.patch
>
>
> Currently windows defaults to SimpleFSDirectory, but this is a problem due to the synchronization.
> I have been benchmarking queries *sequentially* and was pretty surprised at how much faster
> MMapDirectory is, for example for cases that do many seeks.
> I think we should change the defaults for windows as such:
> if (WINDOWS and UNMAP_SUPPORTED and 64-bit)
>   use MMapDirectory
> else
>   use SimpleFSDirectory 
> I think we should just consider doing this for 4.0 only and see how it goes.

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