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https://issues.apache.org/jira/browse/CODEC-174?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13812958#comment-13812958
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Thomas Champagne commented on CODEC-174:
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The patches are based on top of trunk :
http://svn.apache.org/repos/asf/commons/proper/codec/trunk
All tests pass after applying patches.
With the test program, I obtain this result :
Without patch :
{quote}Time for encoding 20000 times the input 'Angelo' : 10537 ms{quote}
With the patch delete-subsequence-cache :
{quote}Time for encoding 20000 times the input 'Angelo' : 8997 ms{quote}
With the patch : change-rules-storage-to-Map :
{quote}Time for encoding 20000 times the input 'Angelo' : 4979 ms{quote}
> 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, 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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