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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2825) FSDirectory.open should return MMap on 64-bit Solaris
Date Sun, 26 Dec 2010 22:53:46 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12975180#action_12975180
] 

Robert Muir commented on LUCENE-2825:
-------------------------------------

bq. CPU cache / TLB effects? Using more address space isn't completely free.

In the case of Solaris I think there is much less of a chance of TLB effects? 
For example on Solaris java automatically uses large pages (unlike Linux, Windows etc).

http://www.oracle.com/technetwork/java/javase/tech/largememory-jsp-137182.html


> FSDirectory.open should return MMap on 64-bit Solaris
> -----------------------------------------------------
>
>                 Key: LUCENE-2825
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2825
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Store
>            Reporter: Robert Muir
>             Fix For: 3.1, 4.0
>
>         Attachments: LUCENE-2825.patch
>
>
> MMap is ~ 30% faster than NIOFS on this platform.

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