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From "Thomas Champagne (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CODEC-174) Improve performance of Beider Morse encoder
Date Fri, 08 Nov 2013 15:27:17 GMT

     [ https://issues.apache.org/jira/browse/CODEC-174?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Thomas Champagne updated CODEC-174:
-----------------------------------

    Attachment: TestCacheSubSequence.java

I've created a program to test the "cache subSequence" and I've obtained this result :
{quote}
Test with String : 825 ms
Test with StringBuilder : 8109 ms
Test with cached String : 6956 ms
Test with cached StringBuilder : 4736 ms
{quote}

We can see that the best method to get a subsequence of CharSequence is to used the String
class. 

I will update the delete-subsequence-cache patch.

> Improve performance of Beider Morse encoder
> -------------------------------------------
>
>                 Key: CODEC-174
>                 URL: https://issues.apache.org/jira/browse/CODEC-174
>             Project: Commons Codec
>          Issue Type: Improvement
>    Affects Versions: 1.6, 1.7
>            Reporter: Thomas Champagne
>              Labels: patch, performance
>         Attachments: CODEC-174-change-rules-storage-to-Map.patch, CODEC-174-delete-subsequence-cache.patch,
CODEC-174-reuse-set-in-PhonemeBuilder.patch, TestCacheSubSequence.java, test-commons-codec-test-bm.zip
>
>
> I use Beider Morse encoder with Solr. When it indexes a lot of documents using this encoder,
the import time is multiplied by 30. So, I have decided to optimize the current implementation
in the commons-codec.
> Currently, I have created two patch. The first patch delete a "performance hack" about
a subsequence cache. This cache doesn't optimize performance and after deleting it, you can
win some milliseconds.
> The second patch changes the storage of the rules in memory using a Map instead of List.
With it, you can access to a rule directly with the beginning of pattern. This patch divide
the encoding time by 2.
> I will try to find more improvement. If you have any idea, please tell me it.



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