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https://issues.apache.org/jira/browse/LUCENE-7261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15298281#comment-15298281
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Yonik Seeley commented on LUCENE-7261:
--------------------------------------
Thanks Adrien, interesting. Definitely not the results I expected (but I never
tested against anything else). IIRC I think reorder looked a bit different in
my implementation. When I get some time, I'll take a crack at it just for the
fun of it :-)
> Speed up LSBRadixSorter
> -----------------------
>
> Key: LUCENE-7261
> URL: https://issues.apache.org/jira/browse/LUCENE-7261
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Fix For: 6.1, master (7.0)
>
> Attachments: LUCENE-7261.patch, MSBRadixSorter.java
>
>
> Currently it always does 4 passes over the data (one per byte, since ints
> have 4 bytes). However, most of the time, we know {{maxDoc}}, so we can use
> this information to do fewer passes when they are not necessary. For
> instance, if maxDoc is less than or equal to 2^24, we only need 3 passes, and
> if maxDoc is less than or equals to 2^16, we only need two passes.
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