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From "Earwin Burrfoot (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1607) String.intern() faster alternative
Date Sun, 19 Apr 2009 19:39:47 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12700604#action_12700604
] 

Earwin Burrfoot commented on LUCENE-1607:
-----------------------------------------

bq. What was the field count? Is it still a considerable speedup with hundreds of fields without
slowing anything else down ?
The field count was 1 :) I rewrote the benchmark, with extra code Java6 speedup on single
already interned field became 12.5x.
Results for three java varieties, and different sets of keys follow:

Java 6 (64, server):

  1 key
interned 12.47x
uninterned 3.76x

  10 keys
interned 8.03x
uninterned 3.08x

  100 keys
interned 6.58x
uninterned 2.55x

  1000 keys
interned 5.39x
uninterned 2.69x

Java 5 (64, server):

  1 key
interned 9.84x
uninterned 5.03x

  10 keys
interned 7.00x
uninterned 4.61x

  100 keys
interned 6.61x
uninterned 2.28x

  1000 keys
interned 4.73x
uninterned 2.73x

Java 4 (32, client):

  1 key
interned 4.90x
uninterned 2.88x

  10 keys
interned 4.08x
uninterned 2.67x

  100 keys
interned 3.88x
uninterned 2.52x

  1000 keys
interned 3.44x
uninterned 2.31x


> String.intern() faster alternative
> ----------------------------------
>
>                 Key: LUCENE-1607
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1607
>             Project: Lucene - Java
>          Issue Type: Improvement
>            Reporter: Earwin Burrfoot
>             Fix For: 2.9
>
>         Attachments: intern.patch, LUCENE-1607.patch
>
>
> By using our own interned string pool on top of default, String.intern() can be greatly
optimized.
> On my setup (java 6) this alternative runs ~15.8x faster for already interned strings,
and ~2.2x faster for 'new String(interned)'
> For java 5 and 4 speedup is lower, but still considerable.

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