[ https://issues.apache.org/jira/browse/LUCENE-10225 ]
Bruno Roustant deleted comment on LUCENE-10225:
-----------------------------------------
was (Author: broustant):
PR: https://github.com/apache/lucene/pull/430
> Improve IntroSelector with 3-way partitioning
> ---------------------------------------------
>
> Key: LUCENE-10225
> URL: https://issues.apache.org/jira/browse/LUCENE-10225
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Bruno Roustant
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> The same way we improved IntroSorter, we can improve IntroSelector with
> Bentley-McIlroy 3-way partitioning. The gain in performance is roughly the
> same.
> With this new approach, we always use medians-of-medians (Tukey's Ninther),
> so there is no real gain to fallback to a slower medians-of-medians technique
> as an introspective protection (like the existing implementation does).
> Instead we can simply shuffle the sub-range if we exceed the recursive max
> depth (this does not change the speed as this intro-protective mechanism
> almost never happens - maybe only in adversarial cases).
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