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https://issues.apache.org/jira/browse/LUCENE-3198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13048818#comment-13048818
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Robert Muir commented on LUCENE-3198:
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why jump the gun, we can just enable it for linux/64-bit.
if others like freebsd or macos X are tested, then we add those to the list,
but mmap is a little bit scary to just apply as a blanket default?
in all cases it should be like the current logic: if (XYZ_OS && 64_bit &&
*UNMAP_SUPPORTED*)
> Change default Directory impl on 64bit linux to MMap
> ----------------------------------------------------
>
> Key: LUCENE-3198
> URL: https://issues.apache.org/jira/browse/LUCENE-3198
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/store
> Reporter: Michael McCandless
> Fix For: 3.3, 4.0
>
>
> Consistently in my NRT testing on Fedora 13 Linux, 64 bit JVM (Oracle
> 1.6.0_21) I see MMapDir getting better search and merge performance when
> compared to NIOFSDir.
> I think we should fix the default.
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