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From "Yonik Seeley (JIRA)" <>
Subject [jira] Commented: (LUCENE-365) [PATCH] Performance improvement to DisjunctionSumScorer
Date Tue, 17 Oct 2006 21:23:39 GMT
    [ ] 
Yonik Seeley commented on LUCENE-365:

> The ASF licence is in the sources

Yeah, I was just trying to be safe.
It seems like there might be a small distinction between granting a license to the ASF, and
including an ASF license in the header.  Does anyone know if it matters?

> [PATCH] Performance improvement to DisjunctionSumScorer
> -------------------------------------------------------
>                 Key: LUCENE-365
>                 URL:
>             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: Lucene Developers
>         Attachments:,,,
> 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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