Hi,
I can't find anything in the archives, but something to do with
caching rung a bell in my mind. If you take a look in DOMDocumentImpl,
you will see that we assign a 29 place table. After this is used up it
doubles in size. I suggest you start the table very big and or adjust the
algorithm that rehashes in RefHashTableOf.
Gareth
On Thu, 4 Sep 2003, Agrawal, Vikas (ELS) wrote:
> Thanks Gareth for your reply. I am using xml4c 2.2.0. You are right that it
> is just because of user data. Once I comment that line and code becomes
> fast. But I do need to set UserData. Could you suggest me what is the
> proposed solution to this.
> Thanks & Regards
> Vikas Agrawal
>
> -----Original Message-----
> From: Gareth Reakes [mailto:[EMAIL PROTECTED]
> Sent: 04 September 2003 15:16
> To: [EMAIL PROTECTED]
> Subject: Re: DOMBuilder is terribly slow: need quick reply
>
>
> Hi,
> I recall some discussion a while back about having lots of
> userdata being very slow. Take out that line and reparse and if that is
> the case then I will wrack my brain (or we could always look in the
> archives). I recall a proposed solution to this as well. What version are
> you using?
>
> Gareth
>
>
>
> On Thu, 4 Sep 2003, Agrawal, Vikas (ELS) wrote:
>
> > Hi All,
> >
> > I am using DOMBuilder as a parser to parse my 10 MB file and it is
> terribly
> > horribly slow. Could anybody suggest me how to improve perfomance. James
> > clark SP parser was used to take not more than a 30 seconds to parse this
> > file. DOMBuilder is taking around 20 minutes to parse my file if I
> override
> > the startElement function as follows.
> >
> > Normally DOMBuilder is also efficient and taking just 30 seconds if I do
> not
> > override the startElement function. I am wondering why is it adding
> another
> > 19 and half minutes in parsing time if I just override the startElement
> and
> > that is just to put node location information in the node user data.
> >
> > Am I doing something wrong in the overridden startElement function below.
> >
> > class EsDOMBuilderImpl : public DOMBuilderImpl
> >
> > void EsDOMBuilderImpl::startElement
> > (
> > const XMLElementDecl& elemDecl
> > , const unsigned int urlId
> > , const XMLCh* const elemPrefix
> > , const RefVectorOf<XMLAttr>& attrList
> > , const unsigned int attrCount
> > , const bool isEmpty
> > , const bool isRoot
> > )
> > {
> > const XMLCh* const systemId = 0;
> >
> >
> AbstractDOMParser::startElement(elemDecl,urlId,elemPrefix,attrList,attrCount
> > ,isEmpty,isRoot);
> > XMLScanner* sc = this->getScanner();
> > const Locator* loc = sc->getLocator();
> >
> > int lineNum = loc->getLineNumber();
> > int colNum = loc->getColumnNumber();
> > int offset = sc->getSrcOffset();
> > DOMNode* node = this->getCurrentNode();
> > DOMLocator* location = new DOMLocatorImpl(lineNum, colNum,
> > getCurrentNode(), systemId);
> > location->setOffset(offset);
> >
> > node->setUserData(locXmlStr_,location,0);
> >
> > DOMLocator* vlocator = (DOMLocator*)node->getUserData(locXmlStr_);
> > return;
> > }
> >
> > In the following way I am creating the parser
> > DOMBuilder* XmlDocumentTree::parserInstance()
> > {
> > if(parserInstance_ == NULL)
> > {
> > static const XMLCh gLS[] = { chLatin_L, chLatin_S, chNull };
> >
> >
> DOMImplementationRegistry::addSource((DOMImplementationSource*)EsDOMImplemen
> > tationImpl::getDOMImplementationImpl());
> > DOMImplementation *impl =
> > DOMImplementationRegistry::getDOMImplementation(gLS);
> >
> > parserInstance_ =
> >
> ((DOMImplementationLS*)impl)->createDOMBuilder(DOMImplementationLS::MODE_SYN
> > CHRONOUS, 0); // it returns EsDOMBuilderImpl class pointer.
> > delete impl;
> > parserInstance_->setFeature(XMLUni::fgDOMValidation, true);
> > parserInstance_->setFeature(XMLUni::fgDOMNamespaces, false);
> > //parserInstance_->setFeature(X("namespaces"), true);
> >
> >
> > parserInstance_->setFeature(XMLUni::fgDOMEntities, false);
> > parserInstance_->setFeature(XMLUni::fgXercesCalculateSrcOfs,
> > true);
> >
> >
> ((EsDOMBuilderImpl*)parserInstance_)->setIncludeIgnorableWhitespace(false);
> > }
> > return parserInstance_;
> > }
> >
> > I use it in the following way
> >
> > XMLPlatformUtils::Initialize();
> > app->init();
> > parser = parserInstance();
> >
> > errHandler_ = new EsDOMErrorHandler(warn);
> > parserInstance_->setErrorHandler(errHandler_);
> >
> > entHandler_ = new EsXml4cDomEntityResolver();
> > entHandler_->addDirToPath(env);
> > parserInstance_->setEntityResolver(entHandler_);
> > DOMDocument * doc = 0;
> > doc = parser->parseURI(fname.c_str());
> > node = doc->getDocumentElement();
> >
> > Thanks & Regards
> > Vikas Agrawal
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: [EMAIL PROTECTED]
> > For additional commands, e-mail: [EMAIL PROTECTED]
> >
> >
> >
>
>
--
Gareth Reakes, Head of Product Development +44-1865-203192
DecisionSoft Limited http://www.decisionsoft.com
XML Development and Services
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