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https://issues.apache.org/jira/browse/LUCENE-10145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17424057#comment-17424057
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Uwe Schindler commented on LUCENE-10145:
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Thanks. I forgot to mention that the Arrays JDK methods only help for longer
slices (8). So if you compare hundreds of bytes, it will internally use longs.
> Use VarHandles to speedup byte[] comparisons in some cases
> ----------------------------------------------------------
>
> Key: LUCENE-10145
> URL: https://issues.apache.org/jira/browse/LUCENE-10145
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
> Fix For: main (9.0)
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> I noticed that using Long#compareUnsigned on longs read via VarHandles is
> significantly faster than calling compareUnsigned directly. There are cases
> when this could be leveraged easily such as BKDWriter, which often keeps
> comparing 4-bytes or 8-bytes across byte[] arrays.
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