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https://issues.apache.org/jira/browse/LUCENE-7261?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand updated LUCENE-7261:
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Attachment: MSBRadixSorter.java
[[email protected]] FYI I played with MSB radix sort to see how it compares
with LSB in terms of performance but LSB outperformed it by about 2x. I am
attaching the code here in case you want to have a look, it is totally possible
that the implementation is not optimal...
> 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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