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From "Greg Bowyer (JIRA)" <>
Subject [jira] [Commented] (LUCENE-3178) Native MMapDir
Date Tue, 25 Mar 2014 23:41:18 GMT


Greg Bowyer commented on LUCENE-3178:

Shall we call these experiments done, I think it concludes that where we do get wins they
are minor and the baggage that comes with is a bit too much

> 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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