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From "Rene Schwietzke (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-1309) Using IndexSearcher in a multithreaded context is slow
Date Wed, 18 Jun 2008 20:01:45 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-1309?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rene Schwietzke updated LUCENE-1309:
------------------------------------

    Attachment: yad.zip

> Using IndexSearcher in a multithreaded context is slow
> ------------------------------------------------------
>
>                 Key: LUCENE-1309
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1309
>             Project: Lucene - Java
>          Issue Type: Bug
>    Affects Versions: 2.3.1, 2.3.2
>         Environment: * WinXP, Dual Core Centrino
> * Opensuse Linux, Dual Core AMD
> java version "1.6.0_06"
> Java(TM) SE Runtime Environment (build 1.6.0_06-b02)
> Java HotSpot(TM) Client VM (build 10.0-b22, mixed mode, sharing)
>            Reporter: Rene Schwietzke
>         Attachments: yad.zip
>
>
> The attached code allows to search with a single IndexSearcher across threads or with
a single instance per Thread, additionally it allows to deals with String.intern in Field
from LUCENE-1308.
> Really interesting is the behavior of the current implementation (Field String.intern)
The performance improves dramatically.
> Is this by design? Because it is usually recommended to reuse the IndexSearcher. How
about a version to supports mult-threading much better basically delivering a read-only view?
> The following results have been measured. The [main] part is a single threaded run. The
following thread results
> _Field String.intern, Single Searcher_
> [main] Search  took: 3453ms
> [Thread-2] Search  took: 17812ms
> [Thread-3] Search  took: 18313ms
> [Thread-1] Search  took: 18234ms
> [Thread-0] Search  took: 18562ms
> _Field WeakHashMap, Single Searcher_
> [main] Search  took: 3156ms
> [Thread-3] Search  took: 14953ms
> [Thread-1] Search  took: 15593ms
> [Thread-0] Search  took: 15656ms
> [Thread-2] Search  took: 16188ms
> _Field ConcurrentHashMap, Single Searcher_
> [main] Search  took: 2844ms
> [Thread-1] Search  took: 14812ms
> [Thread-0] Search  took: 14890ms
> [Thread-2] Search  took: 15172ms
> [Thread-3] Search  took: 14656ms
> _Field intern, Searcher per Thread_
> [main] Search  took: 3687ms
> [Thread-2] Search  took: 10766ms
> [Thread-1] Search  took: 10734ms
> [Thread-0] Search  took: 11047ms
> [Thread-3] Search  took: 10938ms
> _Field Weak, Searcher per Thread_
> [main] Search  took: 3187ms
> [Thread-3] Search  took: 11625ms
> [Thread-2] Search  took: 12484ms
> [Thread-1] Search  took: 12609ms
> [Thread-0] Search  took: 12391ms
> _Field Concurrent, Searcher per Thread_
> [main] Search  took: 2938ms
> [Thread-3] Search  took: 10203ms
> [Thread-2] Search  took: 10360ms
> [Thread-1] Search  took: 10406ms
> [Thread-0] Search  took: 10719ms

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