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From "Christopher Currens (JIRA)" <j...@apache.org>
Subject [Lucene.Net] [jira] [Commented] (LUCENENET-425) MMapDirectory implementation
Date Tue, 14 Jun 2011 19:30:48 GMT

    [ https://issues.apache.org/jira/browse/LUCENENET-425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13049359#comment-13049359
] 

Christopher Currens commented on LUCENENET-425:
-----------------------------------------------

On a 1.18GB index of only text:

FS Reader: 27
MMap Reader: 90
-----------
FS Reader: 38
MMap Reader: 77
Press any key to continue . . .

> MMapDirectory implementation
> ----------------------------
>
>                 Key: LUCENENET-425
>                 URL: https://issues.apache.org/jira/browse/LUCENENET-425
>             Project: Lucene.Net
>          Issue Type: New Feature
>    Affects Versions: Lucene.Net 2.9.4g
>            Reporter: Digy
>            Priority: Trivial
>             Fix For: Lucene.Net 2.9.4g
>
>         Attachments: MMapDirectory.patch
>
>
> Since this is not a direct port of MMapDirectory.java, I'll put it under "Support" and
implement MMapDirectory as 
> {code}
> public class MMapDirectory:Lucene.Net.Support.MemoryMappedDirectory
> {
> }
> {code}
> If a Mem-Map can not be created(for ex, if the file is too big to fit in 32 bit address
range), it will default to FSDirectory.FSIndexInput
> In my tests, I didn't see any performance gain in 32bit environment and I consider it
as better then nothing. 
> I would be happy if someone could send test results on 64bit platform.
> DIGY

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