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From "Earwin Burrfoot (JIRA)" <>
Subject [jira] Commented: (LUCENE-2825) should return MMap on 64-bit Solaris
Date Mon, 27 Dec 2010 07:46:47 GMT


Earwin Burrfoot 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).

For, like, 13Gb of memory-mapped index, I've seen no noticeable difference between having
large pages on and off under Linux. That's some anecdotal evidence, as I'ven't done any extensive
research, but still.

> should return MMap on 64-bit Solaris
> -----------------------------------------------------
>                 Key: LUCENE-2825
>                 URL:
>             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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