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Date: Tue, 9 Dec 2008 06:20:46 -0800 (PST)
From: "Marvin Humphrey (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-1483) Change IndexSearcher to use
 MultiSearcher semantics for sorted searches
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    [ https://issues.apache.org/jira/browse/LUCENE-1483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12654805#action_12654805 ] 

Marvin Humphrey commented on LUCENE-1483:
-----------------------------------------

> Quick micro bench - did it twice and both times came out 17% slower.

I'd guess that all the OO construction/destruction costs in this part of your patch are slowing things down.

{code}
+    Searchable[] searchers = new Searchable[readers.length];
+    for(int i = 0; i < readers.length; i++) {
+      searchers[i] = new IndexSearcher(readers[i]);
+    }
+
+    MultiSearcher multiSearcher = new MultiSearcher(searchers);
+    return multiSearcher.search(weight, filter, nDocs, sort);
{code}

> Change IndexSearcher to use MultiSearcher semantics for sorted searches
> -----------------------------------------------------------------------
>
>                 Key: LUCENE-1483
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1483
>             Project: Lucene - Java
>          Issue Type: Improvement
>    Affects Versions: 2.9
>            Reporter: Mark Miller
>            Priority: Minor
>         Attachments: LUCENE-1483.patch
>
>
> Here is a quick test patch. FieldCache for sorting is done at the individual IndexReader level and reloading the fieldcache on reopen can be much faster as only changed segments need to be reloaded.

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