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Posted to c-dev@xerces.apache.org by "David Bertoni (JIRA)" <xe...@xml.apache.org> on 2009/03/20 22:47:50 UTC
[jira] Commented: (XERCESC-1857) unique/key constraint on non
string field/attriibute slows validation 6x times vs string attriibute
[ https://issues.apache.org/jira/browse/XERCESC-1857?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12685370#action_12685370 ]
David Bertoni commented on XERCESC-1857:
----------------------------------------
Yes, please zip up the schema files, the XML document, and the code so someone can investigate.
> unique/key constraint on non string field/attriibute slows validation 6x times vs string attriibute
> ---------------------------------------------------------------------------------------------------
>
> Key: XERCESC-1857
> URL: https://issues.apache.org/jira/browse/XERCESC-1857
> Project: Xerces-C++
> Issue Type: Bug
> Components: Validating Parser (XML Schema)
> Affects Versions: 3.0.1
> Environment: Linux, Red Hat Enterprise Linux ES release 4 (Nahant Update 4), gcc 3.4.6, 32 bits.
> Reporter: Leonid G
> Attachments: xml_validation_test.zip
>
>
> I have prepared a fairly small schema with 'xs:unique' constraint on nested element.
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
> <xs:element name="el1">
> <xs:element name="el2">
> <xs:element name="el3">
> <xs:attribute name="key" type="xs:string" use="required"/>
> <!-- <xs:attribute name="key" type="xs:unsignedInt" use="required"/>-->
> </xs:element name>
> <xs:unique name="uniqCreativeKey">
> <xs:selector xpath="cam:creative"/>
> <xs:field xpath="@key"/>
> </xs:unique>
> </xs:element name>
> </xs:element name>
> </xs:schema>
> I need to validate a relatively large xml (~ 100Kb) against this schema.
> Load + validation take about 10s and process consumes ~100Mb of memory. I am using SAX, not DOM.
> If I change schema definition slightly to make type of "unique" attribute to be unsignedInt instead of string - than code runs ~ 1min:10 sec (7 times slower) and also uses about 100Mb of RAM.
> Thus I have two questions:
> 1. Why parser requires 100Mb of RAM to load and validate 100Kb file
> 2. Why changing attribute definition type from xs:string to xs:unsignedInt slows validation 7 times?
> I have built xerces myself from sources.
> ./configure --disable-shared --enable-netaccessor-socket --enable-msgloader-inmemory --prefix=/mnt/builder/3rdParty/xml/xerces-c/3.0.1 --libdir=/mnt/builder/3rdParty/xml/xerces-c/3.0.1/lib.gcc-3.4.6
> I can provide schema, xml and code that I am running.
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