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Posted to j-dev@xerces.apache.org by "Chris Simmons (JIRA)" <xe...@xml.apache.org> on 2010/06/01 17:47:37 UTC
[jira] Created: (XERCESJ-1449) Validation of schema type unions are
relatively slow due to use of exceptions.
Validation of schema type unions are relatively slow due to use of exceptions.
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Key: XERCESJ-1449
URL: https://issues.apache.org/jira/browse/XERCESJ-1449
Project: Xerces2-J
Issue Type: Improvement
Components: XML Schema 1.0 Datatypes
Reporter: Chris Simmons
I'll shortly attach some example code which shows that validating
2010-01-01T00:00:00.000Z
against the union (date, dateTime) is slower by a factor of three than validating against (dateTime, date).
This appears to be because if validation fails against the first member of the union then an exception is thrown.
It would therefor be quicker to change the simple type validation to allow an error handler of some sort to be passed in so that union types will not have to use exception handling when validating.
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[jira] Updated: (XERCESJ-1449) Validation of schema type unions are
relatively slow due to use of exceptions.
Posted by "Chris Simmons (JIRA)" <xe...@xml.apache.org>.
[ https://issues.apache.org/jira/browse/XERCESJ-1449?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Chris Simmons updated XERCESJ-1449:
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Attachment: XercesUnionPerformance.zip
This is a simple performance harness (eclipse project zip). Typical output of the main method's second pass is as follows:-
string took 146
dateTime took 242
dateOrDateTime took 1013
dateTimeOrDate took 321
The names refer to schema types or unions. Note that dateOrDateTime is about 3* slower.
> Validation of schema type unions are relatively slow due to use of exceptions.
> ------------------------------------------------------------------------------
>
> Key: XERCESJ-1449
> URL: https://issues.apache.org/jira/browse/XERCESJ-1449
> Project: Xerces2-J
> Issue Type: Improvement
> Components: XML Schema 1.0 Datatypes
> Reporter: Chris Simmons
> Attachments: XercesUnionPerformance.zip
>
>
> I'll shortly attach some example code which shows that validating
> 2010-01-01T00:00:00.000Z
> against the union (date, dateTime) is slower by a factor of three than validating against (dateTime, date).
> This appears to be because if validation fails against the first member of the union then an exception is thrown.
> It would therefor be quicker to change the simple type validation to allow an error handler of some sort to be passed in so that union types will not have to use exception handling when validating.
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[jira] Commented: (XERCESJ-1449) Validation of schema type unions
are relatively slow due to use of exceptions.
Posted by "Chris Simmons (JIRA)" <xe...@xml.apache.org>.
[ https://issues.apache.org/jira/browse/XERCESJ-1449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12874510#action_12874510 ]
Chris Simmons commented on XERCESJ-1449:
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Actually the slowness seems to scale with the depth of the stack too. If I add a bit of recursion to add 50 layers to the stack like this
private static void runTests(final XML11Configuration config) throws IOException {
runTests(config, 50);
}
private static void runTests(final XML11Configuration config, final int depth) throws IOException {
if (depth == 0) {
process(config, "string");
process(config, "dateTime");
process(config, "dateOrDateTime"); // Union (date, dateTime)
process(config, "dateTimeOrDate"); // Union (dateTime, date)
}
else {
runTests(config, depth - 1);
}
}
then it takes more like 8 times longer. This is more like the performance I've seen in real life as the stack is likely to be deeper than in my original sample.
> Validation of schema type unions are relatively slow due to use of exceptions.
> ------------------------------------------------------------------------------
>
> Key: XERCESJ-1449
> URL: https://issues.apache.org/jira/browse/XERCESJ-1449
> Project: Xerces2-J
> Issue Type: Improvement
> Components: XML Schema 1.0 Datatypes
> Reporter: Chris Simmons
> Attachments: XercesUnionPerformance.zip
>
>
> I'll shortly attach some example code which shows that validating
> 2010-01-01T00:00:00.000Z
> against the union (date, dateTime) is slower by a factor of three than validating against (dateTime, date).
> This appears to be because if validation fails against the first member of the union then an exception is thrown.
> It would therefor be quicker to change the simple type validation to allow an error handler of some sort to be passed in so that union types will not have to use exception handling when validating.
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