[jira] [Commented] (LUCENE-7261) Speed up LSBRadixSorter

["Yonik Seeley (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-7261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15298281#comment-15298281 ] 

Yonik Seeley commented on LUCENE-7261:
--------------------------------------

Thanks Adrien, interesting.  Definitely not the results I expected (but I never tested against anything else).  IIRC I think reorder looked a bit different in my implementation. When I get some time, I'll take a crack at it just for the fun of it :-)

> 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.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: dev-help@lucene.apache.org