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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-4923) remove minShouldMatch/speed up DisjunctionSumScorer
Date Wed, 10 Apr 2013 06:34:16 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-4923?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Muir updated LUCENE-4923:
--------------------------------

    Attachment: LUCENE-4923.patch

Here's a patch. Just cleaning house on the minShouldMatch gives about a 10% improvement on
luceneutil, but supporting pure disjunctions as a top-level scorer from BooleanWeight is even
better (20%):

{noformat}
                    Task   QPS trunk      StdDev   QPS patch      StdDev                Pct
diff
              OrHighHigh       22.70      (6.5%)       27.45      (4.0%)   20.9% (   9% -
  33%)
               OrHighMed       31.17      (6.7%)       38.06      (4.6%)   22.1% (  10% -
  35%)
               OrHighLow       71.52      (7.1%)       87.48      (5.5%)   22.3% (   9% -
  37%)
{noformat} 
                
> remove minShouldMatch/speed up DisjunctionSumScorer
> ---------------------------------------------------
>
>                 Key: LUCENE-4923
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4923
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/query/scoring
>    Affects Versions: 4.3
>            Reporter: Robert Muir
>         Attachments: LUCENE-4923.patch
>
>
> LUCENE-4571 added a MinShouldMatchScorer: capable of using advance() on subscorers for
minShouldMatch > 1. 
> However, we didn't yet cleanup the (now dead) minShouldMatch logic from DisjunctionSumScorer:
which is now only used for pure disjunctions. This can also give some reasonable performance
improvements for in-order collection.

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