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https://issues.apache.org/jira/browse/LUCENE-3509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13134293#comment-13134293
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Martijn van Groningen commented on LUCENE-3509:
-----------------------------------------------

I also prefer to have a default that matches with the FieldCache. I will change 
the patch so that the option is at the codec impl level 
(DefaultDocValuesConsumer).
                
> Add settings to IWC to optimize IDV indices for CPU or RAM respectivly
> ----------------------------------------------------------------------
>
>                 Key: LUCENE-3509
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3509
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: core/index
>    Affects Versions: 4.0
>            Reporter: Simon Willnauer
>            Priority: Minor
>             Fix For: 4.0
>
>         Attachments: LUCENE-3509.patch
>
>
> spinnoff from LUCENE-3496 - we are seeing much better performance if required 
> bits for PackedInts are rounded up to a 8/16/32/64. We should add this option 
> to IWC and default to round up ie. more RAM & faster lookups.

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