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(_at_)aktitech(_dot_)com]
Sent: 06 October 2004 00:47
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: [xsl] 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[(_at_)id=\'region93\']">
<xsl:apply-templates />
</xsl:template>
<xsl:template match="assignment[(_at_)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>
</xsl:text>
</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>
SHEET 2 - same thing, but no " no , and no
------------
<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[(_at_)id=\'region93\']">
<xsl:apply-templates />
</xsl:template>
<xsl:template match="assignment[(_at_)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>
--+------------------------------------------------------------------
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
To unsubscribe, go to: http://lists.mulberrytech.com/xsl-list/
or e-mail:
<mailto:xsl-list-unsubscribe(_at_)lists(_dot_)mulberrytech(_dot_)com>
--+--