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https://issues.apache.org/jira/browse/CODEC-166?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Neidhart updated CODEC-166:
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Attachment: CODEC-166_size.patch
Patch that pre-initializes the Context.buffer with a better estimate, and calls
ensureBufferSize only when the buffer is actually accessed.
> Base64 could be faster
> ----------------------
>
> Key: CODEC-166
> URL: https://issues.apache.org/jira/browse/CODEC-166
> Project: Commons Codec
> Issue Type: Bug
> Affects Versions: 1.7
> Reporter: Julius Davies
> Assignee: Julius Davies
> Fix For: 1.8
>
> Attachments: base64bench.zip, CODEC-166.draft.patch, CODEC-166.patch,
> CODEC-166_size.patch
>
>
> Our Base64 consistently performs 3 times slower compared to MiGBase64 and
> iHarder in the byte[] and String encode() methods.
> We are pretty good on decode(), though a little slower (approx. 33% slower)
> than MiGBase64.
> We always win in the Streaming methods (MiGBase64 doesn't do streaming).
> Yay! :-) :-) :-)
> I put together a benchmark. Here's a typical run:
> {noformat}
> LARGE DATA new byte[12345]
> iHarder...
> encode 486.0 MB/s decode 158.0 MB/s
> encode 491.0 MB/s decode 148.0 MB/s
> MiGBase64...
> encode 499.0 MB/s decode 222.0 MB/s
> encode 493.0 MB/s decode 226.0 MB/s
> Apache Commons Codec...
> encode 142.0 MB/s decode 146.0 MB/s
> encode 138.0 MB/s decode 150.0 MB/s
> {noformat}
> I believe the main approach we can consider to improve performance is to
> avoid array copies at all costs. MiGBase64 even counts the number of valid
> Base64 characters ahead of time on decode() to precalculate the result's size
> and avoid any array copying!
> I suspect this will mean writing out separate execution paths for the String
> and byte[] methods, and keeping them out of the streaming logic, since the
> streaming logic is founded on array copy.
> Unfortunately this means we will diminish internal reuse of the streaming
> implementation, but I think it's the only way to improve performance, if we
> want to.
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