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https://issues.apache.org/jira/browse/LUCENE-3509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13135423#comment-13135423
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Martijn van Groningen commented on LUCENE-3509:
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We currently only use it for types BYTES_VAR_SORTED and BYTES_FIXED_SORTED
hence the name. I think we can use it for the other types as well. This option
basically decides whether DirectInt or PacketInt is used (in
PacketInt#getReader()). The DirectInt classes are faster for when using
BYTES_VAR_SORTED and BYTES_FIXED_SORTED types. I'll try and test if this is
also the case for for the other types (I think it will be faster for the other
types as well).
> 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, 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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