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https://issues.apache.org/jira/browse/LUCENE-5720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14014261#comment-14014261
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Robert Muir commented on LUCENE-5720:
-------------------------------------
I tried to hack luceneutil up for a performance test, not sure wikipedia
'title' is the best, but i tried on 1M:
Size: 500KB increase in docvalues data (5.7MB -> 6.2MB)
Note that in context, the entire index is 385MB (no stored fields or vectors),
so the 500KB docvalues increase is negligible.
20% improvement in sort performance.
> Optimize on disk packed integers part 2
> ---------------------------------------
>
> Key: LUCENE-5720
> URL: https://issues.apache.org/jira/browse/LUCENE-5720
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Robert Muir
> Fix For: 4.9, 5.0
>
> Attachments: LUCENE-5720.patch
>
>
> These are heavily optimized for the in-RAM case (for example FieldCache uses
> PackedInts.FAST to make it even faster so), but for the docvalues case they
> are not: we always essentially use COMPACT, we have only one decoder that
> must solve all the cases, even the complicated ones, we use BlockPackedWriter
> for all integers (even if they are ordinals), etc.
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