Using IndexSearcher in a multithreaded context is slow
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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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