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Posted to dev@lucene.apache.org by "Abdul Chaudhry (JIRA)" <ji...@apache.org> on 2005/10/02 07:33:49 UTC

[jira] Updated: (LUCENE-443) ConjunctionScorer tune-up

     [ http://issues.apache.org/jira/browse/LUCENE-443?page=all ]

Abdul Chaudhry updated LUCENE-443:
----------------------------------

    Attachment: ConjunctionScorer.java

Updated a version of the ConjunctionScorer which uses an array rather than a linked list.
The first(), last()  and doc() method calls should probably be in-lined - maybe.


> ConjunctionScorer tune-up
> -------------------------
>
>          Key: LUCENE-443
>          URL: http://issues.apache.org/jira/browse/LUCENE-443
>      Project: Lucene - Java
>         Type: Bug
>   Components: Search
>     Versions: 1.9
>  Environment: Linux, Java 1.5, Large Index with 4 million items and some heavily nested boolean queries
>     Reporter: Abdul Chaudhry
>  Attachments: ConjunctionScorer.java
>
> I just recently ran a load test on the latest code from lucene , which is using a new BooleanScore and noticed the ConjunctionScorer was crunching through objects , especially while sorting as part of the skipTo call. It turns a linked list into an array, sorts the array, then converts the array back to a linked list for further processing by the scoring engines below.
> 'm not sure if anyone else is experiencing this as I have a very large index (> 4 million items) and I am issuing some heavily nested queries
> Anyway, I decide to change the link list into an array and use a first and last marker to "simulate" a linked list.
> This scaled much better during my load test as the java gargbage collector was less - umm - virulent 

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