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From "Robert Muir (JIRA)" <>
Subject [jira] [Commented] (LUCENE-3198) Change default Directory impl on 64bit linux to MMap
Date Mon, 13 Jun 2011 22:01:47 GMT


Robert Muir commented on LUCENE-3198:

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 &&

> Change default Directory impl on 64bit linux to MMap
> ----------------------------------------------------
>                 Key: LUCENE-3198
>                 URL:
>             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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