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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-2650) improve windows defaults in FSDirectory
Date Fri, 17 Sep 2010 17:52:37 GMT
improve windows defaults in FSDirectory
---------------------------------------

                 Key: LUCENE-2650
                 URL: https://issues.apache.org/jira/browse/LUCENE-2650
             Project: Lucene - Java
          Issue Type: Improvement
          Components: Store
    Affects Versions: 4.0
            Reporter: Robert Muir
            Assignee: Robert Muir
             Fix For: 4.0


Currently windows defaults to SimpleFSDirectory, but this is a problem due to the synchronization.

I have been benchmarking queries *sequentially* and was pretty surprised at how much faster
MMapDirectory is, for example for cases that do many seeks.

I think we should change the defaults for windows as such:

if (WINDOWS and UNMAP_SUPPORTED and 64-bit)
  use MMapDirectory
else
  use SimpleFSDirectory 

I think we should just consider doing this for 4.0 only and see how it goes.


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