RFR: JDK-8266431: Dual-Pivot Quicksort improvements (Radix sort) [v7]

[Laurent Bourgès]

On Thu, 15 Jun 2023 09:21:13 GMT, Laurent Bourgès <lbourges at openjdk.org> wrote:

>> * improved  mixed insertion sort (makes whole sorting faster)
>> * introduced Radix which sort shows several times boost of performance and has linear complexity instead of n*ln(n)
>> * improved merging sort for almost sorted data
>> * optimized parallel sorting
>> * improved step for pivot candidates and pivot partitioning
>> * extended existing tests
>> * added benchmarking JMH tests
>> * suggested better buffer allocation: if no memory, it is switched to in-place sorting with no OutOfMemoryError, threshold is 1/16th heap
>> 
>> I am going on previous PR by Vladimir Yaroslavskyi: https://github.com/openjdk/jdk/pull/3938
>
> Laurent Bourgès has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Merge branch 'dpqs23' of github.com:bourgesl/jdk-official into dpqs23
>  - simplified test to enable radix sort (improved sorting on period and shuffle data) + updated version to 22

Please @AlanBateman could you review this PR?

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PR Comment: https://git.openjdk.org/jdk/pull/13568#issuecomment-1653144787