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From "Michael McCandless (JIRA)" <>
Subject [jira] Commented: (LUCENE-871) ISOLatin1AccentFilter a bit slow
Date Mon, 30 Jul 2007 14:40:53 GMT


Michael McCandless commented on LUCENE-871:

OK, for LUCENE-969 I made yet a 3rd option for optimizing

In that patch I reuse the Token instance, using the char[] API for the
Token's text instead of String, and I also re-use a single TokenStream
instance (I did this for all core tokenizers).

I just tested total time to tokenize all wikipedia content with
current trunk (1116 sec) vs with LUCENE-969 (500 sec), with a
WhitespaceTokenizer -> ISOLatin1AccentFilter chain.

I separately timed just creating the documents at 112 sec, to subtract
it off from the above times (so I can measure only cost of

This gives net speedup of this filter is 2.97X faster (1004 sec -> 388

> ISOLatin1AccentFilter a bit slow
> --------------------------------
>                 Key: LUCENE-871
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Analysis
>    Affects Versions: 1.9, 2.0.0, 2.0.1, 2.1, 2.2
>            Reporter: Ian Boston
>         Attachments: fasterisoremove1.patch, fasterisoremove2.patch,
> The ISOLatin1AccentFilter is a bit slow giving 300+ ms responses when used in a highligher
for output responses.
> Patch to follow

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