Hi,
When I have a xsl:key who's select results in no nodes, I notice a
ridiculous increase in processing time.
Below is an example that runs in 4ms when the select returns nodes and
2400ms when no nodes are in the key.
If you run it with more nodes in the xml you'll get even slower
performance.
Thanks,
tim
Xml
<?xml version="1.0" encoding="utf-8"?>
<document>
<node id='1'/>
<node id='2'/>
<node id='3'/>
<node id='4'/>
<node id='5'/>
..etc etc
<node id='2000'/>
</document>
Xsl
<xsl:stylesheet version='1.0'
xmlns:xsl='http://www.w3.org/1999/XSL/Transform'
>
<xsl:output method='text' version='1.0' encoding='utf-8'
indent='no'/>
<!--
<xsl:key name="idKey" match="/document/[EMAIL PROTECTED]'-1']" use="@id"
/>
-->
<xsl:key name="idKey" match="/document/[EMAIL PROTECTED]'2000']"
use="@id" />
<xsl:template match="/">
<xsl:value-of select="count(
key('idKey',
/document/node/@id)
)"
/>
</xsl:template>
</xsl:stylesheet>
With
<xsl:key name="idKey" match="/document/[EMAIL PROTECTED]'-1']" use="@id" />
[EMAIL PROTECTED] xsltests]$ xsltproc -timing -profile test.xsl
test.xml.small
Parsing stylesheet test.xsl took 0 ms
Parsing document test.xml.small took 2 ms
number match name mode Calls Tot
100us Avg
0 / 1 244198
244198
Total 1 244198
Applying stylesheet took 2443 ms
0Saving result took 0 ms
With
<xsl:key name="idKey" match="/document/[EMAIL PROTECTED]'2000']"
use="@id" />
[EMAIL PROTECTED] xsltests]$ xsltproc -timing -profile test.xsl
test.xml.small
Parsing stylesheet test.xsl took 0 ms
Parsing document test.xml.small took 2 ms
number match name mode Calls Tot
100us Avg
0 / 1 346
346
Total 1 346
Applying stylesheet took 4 ms
1Saving result took 0 ms
_______________________________________________
xslt mailing list, project page http://xmlsoft.org/XSLT/
[email protected]
http://mail.gnome.org/mailman/listinfo/xslt
