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https://issues.apache.org/jira/browse/LUCENE-2825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12973213#action_12973213
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Uwe Schindler commented on LUCENE-2825:
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bq. Doesn't MMap automatically consume a lot more memory?
No, it consumes *address space*, this is why it only works on 64 bit. The index
files are mapped into address space, so handled like a SWAP file. They only
consume as much memory from cache space as the operating system decides.
Especially it does not consume memory from java heap!
> 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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