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https://issues.apache.org/jira/browse/LUCENE-2084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12794588#action_12794588
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Steven Rowe commented on LUCENE-2084:
-------------------------------------

To run the benchmark:

# Unpack {{collation.benchmark.tar.bz2}} in a full Lucene-java tree into the 
{{contrib/benchmark/}} directory.  All contents will be put under a new 
directory named {{collation/}}.
# Compile and jarify the localized (ICU)CollationKeyAnalyzer code: from the 
{{collation/}} directory, run the script {{build.test.analyzer.jar.sh}}.
# From an unpatched {{java/trunk/}}, build Lucene's jars: {{ant clean package}}.
# From the {{contrib/benchmark/}} directory, run the collation benchmark: 
{{collation/run-benchmark.sh > unpatched.collation.bm.table.txt}}
# Apply the attached patch to the Lucene-java tree
# From {{java/trunk/}}, build Lucene's jars: {{ant clean package}}.
# From the {{contrib/benchmark/} directory, run the collation benchmark: 
{{collation/run-benchmark.sh > patched.collation.bm.table.txt}}
# Produce the comparison table:  
{{collation/compare.collation.benchmark.tables.pl 
unpatched.collation.bm.table.txt patched.collation.bm.table.txt > 
collation.diff.bm.table.txt}}



> remove Byte/CharBuffer wrapping for collation key generation
> ------------------------------------------------------------
>
>                 Key: LUCENE-2084
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2084
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: contrib/*
>            Reporter: Robert Muir
>            Assignee: Robert Muir
>            Priority: Minor
>             Fix For: 3.1
>
>         Attachments: collation.benchmark.tar.bz2, LUCENE-2084.patch, 
> LUCENE-2084.patch
>
>
> We can remove the overhead of ByteBuffer and CharBuffer wrapping in 
> CollationKeyFilter and ICUCollationKeyFilter.
> this patch moves the logic in IndexableBinaryStringTools into char[],int,int 
> and byte[],int,int based methods, with the previous Byte/CharBuffer methods 
> delegating to these.
> Previously, the Byte/CharBuffer methods required a backing array anyway.

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