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Posted to dev@lucene.apache.org by "ASF subversion and git services (JIRA)" <ji...@apache.org> on 2013/07/31 09:51:50 UTC
[jira] [Commented] (LUCENE-4946) Refactor SorterTemplate
[ https://issues.apache.org/jira/browse/LUCENE-4946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13724987#comment-13724987 ]
ASF subversion and git services commented on LUCENE-4946:
---------------------------------------------------------
Commit 1508757 from [~jpountz] in branch 'dev/trunk'
[ https://svn.apache.org/r1508757 ]
LUCENE-5140: Fixed performance regression of span queries caused by LUCENE-4946.
> Refactor SorterTemplate
> -----------------------
>
> Key: LUCENE-4946
> URL: https://issues.apache.org/jira/browse/LUCENE-4946
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Trivial
> Fix For: 4.4
>
> Attachments: LUCENE-4946.patch, LUCENE-4946.patch, LUCENE-4946.patch
>
>
> When working on TimSort (LUCENE-4839), I was a little frustrated of not being able to add galloping support because it would have required to add new primitive operations in addition to compare and swap.
> I started working on a prototype that uses inheritance to allow some sorting algorithms to rely on additional primitive operations. You can have a look at https://github.com/jpountz/sorts/tree/master/src/java/net/jpountz/sorts (but beware it is a prototype and still misses proper documentation and good tests).
> I think it would offer several advantages:
> - no more need to implement setPivot and comparePivot when using in-place merge sort or insertion sort,
> - the ability to use faster stable sorting algorithms at the cost of some memory overhead (our in-place merge sort is very slow),
> - the ability to implement properly algorithms that are useful on specific datasets but require different primitive operations (such as TimSort for partially-sorted data).
> If you are interested in comparing these implementations with Arrays.sort, there is a Benchmark class in src/examples.
> What do you think?
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