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From "Greg Bowyer (JIRA)" <>
Subject [jira] [Commented] (LUCENE-3178) Native MMapDir
Date Mon, 24 Mar 2014 23:44:46 GMT


Greg Bowyer commented on LUCENE-3178:

Interesting, its also somewhat interesting to see that AndHighLow gets a big jump in performance,
any ideas on why that might be

> Native MMapDir
> --------------
>                 Key: LUCENE-3178
>                 URL:
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/store
>            Reporter: Michael McCandless
>              Labels: gsoc2014
>         Attachments: LUCENE-3178-Native-MMap-implementation.patch, LUCENE-3178-Native-MMap-implementation.patch,
LUCENE-3178-Native-MMap-implementation.patch, LUCENE-3178.patch
> Spinoff from LUCENE-2793.
> Just like we will create native Dir impl (UnixDirectory) to pass the right OS level IO
flags depending on the IOContext, we could in theory do something similar with MMapDir.
> The problem is MMap is apparently quite hairy... and to pass the flags the native code
would need to invoke mmap (I think?), unlike UnixDir where the code "only" has to open the
file handle.

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