RE: csv slows down transform

Performance questions are always specific to the product. I don't know
libxml so I can only speculate.

One possibility is that it's treating a template rule such as

<xsl:template match="Full_Name">
	<xsl:apply-templates />
</xsl:template>

specially because it recognizes that it's identical to the built-in
template, and adding some text to the output kills this optimization. 

Just a conjecture. 14 seconds to process 2500 records does seem excessive.

Michael Kay
http://www.saxonica.com/
 

> -----Original Message-----
> From: Jonathan Kart [mailto:jkart@xxxxxxxxxxxx] 
> Sent: 06 October 2004 00:47
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  csv slows down transform
> 
> Hi all,
> 
> I have 2 sample stylesheets to show you.  They are auto-generated, so 
> please forgive the redundancy and other flaws.  My question is, what 
> does the first stylesheet consistently run slower than the 
> second.  For 
> an xml doc of about 2500 'Contacts' this first sheet takes 
> ~14 seconds, 
> the second less than 1 second.  I swear the only difference 
> is that one 
> inserts quotes and commas around the data while the other does not.  
> It's not a trick question i promise.  The time difference is 
> substantial.  We're using the php libxml extension in a web 
> environment 
> under windows 200 server, and iis.
> 
> Thanks for any help, this is boggling my itty-bitty mind.
> 
> SHEET 1
> -----------
> <xsl:stylesheet version="1.0" exclude-result-prefixes="dt" 
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
> xmlns:dt="http://xsltsl.org/date-time">
> 	<xsl:import 
> href="http://www.newdream.org/CMS/lib/xslsl/stdlib.xsl" />
> 	<xsl:output method="xml" />
> 	<xsl:template match="text()">
> 		<xsl:value-of select="." 
> disable-output-escaping="yes" />
> 	</xsl:template>
> 	<xsl:template match="*">
> 		<xsl:copy>
> 			<xsl:apply-templates select="@*" />
> 			<xsl:apply-templates select="node()" />
> 		</xsl:copy>
> 	</xsl:template>
> 	<xsl:template match="@*">
> 		<xsl:copy />
> 	</xsl:template>
> 	<xsl:template match="/">
> 		<xsl:apply-templates />
> 	</xsl:template>
> 	<xsl:template match="//region[@id=\'region93\']">
> 		<xsl:apply-templates />
> 	</xsl:template>
> 	<xsl:template match="assignment[@id=\'assignment\']">
> 		<xsl:apply-templates />
> 	</xsl:template>
> 	<xsl:template match="Contacts">
> 		<xsl:apply-templates select="Full_Name" />
> 		<xsl:apply-templates select="Activity_Points" />
> 		<xsl:text>
> 			&#10;
> 		</xsl:text>
> 	</xsl:template>
> 	<xsl:template match="Full_Name">
> 		&quot;
> 		<xsl:apply-templates />
> 		&quot;,
> 	</xsl:template>
> 	<xsl:template match="Full_Name" mode="Normal">
> 		&quot;
> 		<xsl:apply-templates />
> 		&quot;,
> 	</xsl:template>
> 	<xsl:template match="Activity_Points">
> 		&quot;
> 		<xsl:apply-templates />
> 		&quot;,
> 	</xsl:template>
> 	<xsl:template match="Activity_Points" mode="Normal">
> 		&quot;
> 		<xsl:apply-templates />
> 		&quot;,
> 	</xsl:template>
> </xsl:stylesheet>
> 
> SHEET 2 - same thing, but no &quot; no , and no &#10;
> ------------
> 
> <xsl:stylesheet version="1.0" exclude-result-prefixes="dt" 
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
> xmlns:dt="http://xsltsl.org/date-time">
> 	<xsl:import 
> href="http://www.newdream.org/CMS/lib/xslsl/stdlib.xsl" />
> 	<xsl:output method="xml" />
> 	<xsl:template match="text()">
> 		<xsl:value-of select="." 
> disable-output-escaping="yes" />
> 	</xsl:template>
> 	<xsl:template match="*">
> 		<xsl:copy>
> 			<xsl:apply-templates select="@*" />
> 			<xsl:apply-templates select="node()" />
> 		</xsl:copy>
> 	</xsl:template>
> 	<xsl:template match="@*">
> 		<xsl:copy />
> 	</xsl:template>
> 	<xsl:template match="/">
> 		<xsl:apply-templates />
> 	</xsl:template>
> 	<xsl:template match="//region[@id=\'region93\']">
> 		<xsl:apply-templates />
> 	</xsl:template>
> 	<xsl:template match="assignment[@id=\'assignment\']">
> 		<xsl:apply-templates />
> 	</xsl:template>
> 	<xsl:template match="Contacts">
> 		<xsl:apply-templates select="Full_Name" />
> 		<xsl:apply-templates select="Activity_Points" />
> 	</xsl:template>
> 	<xsl:template match="Full_Name">
> 		<xsl:apply-templates />
> 	</xsl:template>
> 	<xsl:template match="Full_Name" mode="Normal">
> 		<xsl:apply-templates />
> 	</xsl:template>
> 	<xsl:template match="Activity_Points">
> 		<xsl:apply-templates />
> 	</xsl:template>
> 	<xsl:template match="Activity_Points" mode="Normal">
> 		<xsl:apply-templates />
> 	</xsl:template>
> </xsl:stylesheet>