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Date: Tue, 17 Oct 2006 17:58:36 -0700 (PDT)
From: "Yonik Seeley (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Resolved: (LUCENE-365) [PATCH] Performance improvement to
 DisjunctionSumScorer
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     [ http://issues.apache.org/jira/browse/LUCENE-365?page=all ]

Yonik Seeley resolved LUCENE-365.
---------------------------------

    Fix Version/s: 2.1
       Resolution: Fixed
         Assignee: Yonik Seeley  (was: Lucene Developers)

> [PATCH] Performance improvement to DisjunctionSumScorer
> -------------------------------------------------------
>
>                 Key: LUCENE-365
>                 URL: http://issues.apache.org/jira/browse/LUCENE-365
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Search
>    Affects Versions: CVS Nightly - Specify date in submission
>         Environment: Operating System: other
> Platform: Other
>            Reporter: Paul Elschot
>         Assigned To: Yonik Seeley
>             Fix For: 2.1
>
>         Attachments: BooleanScorerBtree.java, DisjunctionSumScorer.java, DisjunctionSumScorer20061017.patch, ScorerDocQueue.java, TestDisjunctionPerf1.java
>
>
> A recent profile of the new BooleanScorer2 showed that 
> quite a bit of CPU time is spent in the advanceAfterCurrent method 
> of DisjunctionScorer, and in the PriorityQueue of scorers that 
> is used there. 
>  
> This patch reduces the internal overhead of DisjunctionScorer 
> to about 70% of the current one (ie. 30% saving in cpu time). 
> It also reduces the number of calls to the subscorers, but 
> that was not measured. 
>  
> To get this, it was necessary to specialize the PriorityQueue 
> for a Scorer and to add move some code fragments from DisjunctionScorer 
> to this specialized queue.

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