RVM

Improve performance of chacter encoder when encoding to and from arrays

Details

  • Type: Improvement Improvement
  • Status: Closed Closed
  • Priority: Major Major
  • Resolution: Fixed
  • Affects Version/s: None
  • Fix Version/s: 2.9.3
  • Component/s: Runtime: Class Library
  • Labels:
    None
  • Number of attachments :
    0

Description

Currently character set encoding/decoding is perfomed using CharBuffer.get/put and ByteBuffer.get/put, when these are backed up by arrays (the common case) this is burdensome. By using the hasArray check an array based copying loop should be implemented.

Issue Links

supercedes

Bug - A problem which impairs or prevents the functions of the product. RVM-299 possible performance regression on xalan on classpath 0.96

  • Major - Major loss of function.
  • Closed - The issue is considered finished, the resolution is correct. Issues which are not closed can be reopened.

Activity

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Ian Rogers added a comment -

This should improve the performance of the following benchmarks (the amount in brackets is the amount of time they currently spend in the encode loop): SpecJVM 98 Jack (2.5%), DaCapo antlr (6.42%), DaCapo lusearch (2.26%), DaCapo xalan (~2.5%).

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Ian Rogers added a comment - This should improve the performance of the following benchmarks (the amount in brackets is the amount of time they currently spend in the encode loop): SpecJVM 98 Jack (2.5%), DaCapo antlr (6.42%), DaCapo lusearch (2.26%), DaCapo xalan (~2.5%).
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Ian Rogers added a comment -

Patch committed in r13806.

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Ian Rogers added a comment - Patch committed in r13806.

People

  • Assignee:
    Ian Rogers
    Reporter:
    Ian Rogers
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Dates

  • Created:
    Updated:
    Resolved: