MarkupBuilder performance

Details

  • Type: Improvement Improvement
  • Status: Open Open
  • Priority: Major Major
  • Resolution: Unresolved
  • Affects Version/s: 1.6-rc-1
  • Fix Version/s: None
  • Component/s: XML Processing
  • Labels:
    None

Description

MarkupBuilder#escapeXmlValue uses an algorithm for XML escaping that has unneccessary space and time requirements.

The attached patch (for trunk), while having less memory consumption, seems to increase the performance to factors between 5 and 25.

  1. Text File
    patch-MarkupBuilder-trunk.txt
    05/Jan/09 10:10 AM
    6 kB
    Alexander Veit
  2. Text File
    patch-MarkupBuilder-trunk.txt
    05/Jan/09 8:31 AM
    8 kB
    Alexander Veit
  3. Text File
    patch-MarkupBuilder-trunk.txt
    05/Jan/09 8:22 AM
    8 kB
    Alexander Veit

Activity

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Alexander Veit added a comment -

Sorry, now with correct indentation.

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Alexander Veit added a comment - Sorry, now with correct indentation.
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Alexander Veit added a comment -

Probably MarkupBuilder#transformValue(String) could be removed in trunk.

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Alexander Veit added a comment - Probably MarkupBuilder#transformValue(String) could be removed in trunk.
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blackdrag blackdrag added a comment -

if somebody says something is faster I always have first to ask what he tested. You did test escapeXmlValue on Strings where there is nothing to escape I guess. I wouldn't expect this version to be 5-20 times faster for strings with values to be escaped.... Also I think the patch can be improved too... for example using StringBuilder instead of StringBuffer.... and it would be nice if you could avoid the whitespace changes in comments. I would like to see only the parts that really changed

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blackdrag blackdrag added a comment - if somebody says something is faster I always have first to ask what he tested. You did test escapeXmlValue on Strings where there is nothing to escape I guess. I wouldn't expect this version to be 5-20 times faster for strings with values to be escaped.... Also I think the patch can be improved too... for example using StringBuilder instead of StringBuffer.... and it would be nice if you could avoid the whitespace changes in comments. I would like to see only the parts that really changed
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Alexander Veit added a comment -

Some numbers

  • empty string: 25
  • 8k HTML page: 6
  • 64k string containing only <: 200

If trunk is intended to support only Java 1.5 and above all local occurrences of StringBuffer should certainly be replaced with StringBuilder.

For the whitespace: my IDE (Eclipse) removes trailing whitespace when saving files since normally this reduces whitespace noise in development teams. Sorry for that.

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Alexander Veit added a comment - Some numbers
  • empty string: 25
  • 8k HTML page: 6
  • 64k string containing only <: 200
If trunk is intended to support only Java 1.5 and above all local occurrences of StringBuffer should certainly be replaced with StringBuilder. For the whitespace: my IDE (Eclipse) removes trailing whitespace when saving files since normally this reduces whitespace noise in development teams. Sorry for that.
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blackdrag blackdrag added a comment -

what are these numbers? The factor the new version is faster? Well for the empty string that may make sense, but that is not really a relevant case I think. The HTML page is more interesting and more in the area I expected.... but the 64k string... factor 200... that is unexpected.

trunk is supposed to support 1.5 only yes. The retro build can create a 1.4 compatible version for StringBuilder, so the usage of that class is no problem. We are also step-by-step replacing all usages of StringBuffer with StringBuilder already

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blackdrag blackdrag added a comment - what are these numbers? The factor the new version is faster? Well for the empty string that may make sense, but that is not really a relevant case I think. The HTML page is more interesting and more in the area I expected.... but the 64k string... factor 200... that is unexpected. trunk is supposed to support 1.5 only yes. The retro build can create a 1.4 compatible version for StringBuilder, so the usage of that class is no problem. We are also step-by-step replacing all usages of StringBuffer with StringBuilder already
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Alexander Veit added a comment -

Reduced whitespace noise.

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Alexander Veit added a comment - Reduced whitespace noise.
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Paul King added a comment -

Applied a variation of your patch locally but with StringBuilder. Only noticed very minor improvement - but didn't try many cases. I think I will apply anyway shortly - the code is cleaner looking. Not critical for 1.6 RC-2. See what else happens and if I get time before that is released.

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Paul King added a comment - Applied a variation of your patch locally but with StringBuilder. Only noticed very minor improvement - but didn't try many cases. I think I will apply anyway shortly - the code is cleaner looking. Not critical for 1.6 RC-2. See what else happens and if I get time before that is released.

People

  • Assignee:
    Paul King
    Reporter:
    Alexander Veit
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Dates

  • Created:
    Updated: