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Quick Lists
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Bug ID:
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6746334
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Votes
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0
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Synopsis
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SingleByteDecoder can be significantly faster
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Category
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java:char_encodings
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Reported Against
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Release Fixed
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6u12(b01)
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State
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10-Fix Delivered,
bug
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Priority:
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2-High
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Related Bugs
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6763369
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Submit Date
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09-SEP-2008
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Description
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Attached test measures performance of BufferedReader.readline() and it seems that noticiable fraction of
time is spent in sun.nio.cs.SingleByteDecoder.decodeLoop().
Performance seems to improve significantly if SingleByteDecoder is changed to use char array for
byteToChar table instead of String. See suggested change in attachment.
In my experiments this change helps to improve performance of ReadlinePerf test by 35-40% -
time drops from from ~1200ms to 740ms (tested on Windows Vista and XP).
It also have noticeable impact on reading deployment cache. In my experiments performance
savings are around 5-7% (reading manifests from index files by CacheEntry).
Posted Date : 2008-09-09 16:18:20.0
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Work Around
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N/A
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Evaluation
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Suggested fix is attached.
Posted Date : 2008-09-09 16:18:20.0
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Comments
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Submitted On 09-FEB-2009
UlfZibis
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6763369
is not visible.
Where can I get the source code of this enhancements ?
PLEASE NOTE: JDK6 is formerly known as Project Mustang
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