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Re: [xsl] Here's how to benchmark your XSLT program's execution time

2014-11-06 11:09:26
Here's my test:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
  xmlns:df="http://dita2indesign.org/dita/functions";
xmlns:xs="http://www.w3.org/2001/XMLSchema";
  xmlns:relpath="http://dita2indesign/functions/relpath";
xmlns:glossdata="http://dita4publishers.org/glossdata";
  xmlns:applicability="http://dita4publishers.org/applicability";
  xmlns:mapdriven="http://dita4publishers.org/mapdriven";
  xmlns:local="urn:functions:local"
xmlns:index-terms="http://dita4publishers.org/index-terms";
  xmlns:date="java:java.util.Date"
  xmlns:enum="http://dita4publishers.org/enumerables";
exclude-result-prefixes="local xs df xsl relpath glossdata date">
  
  <xsl:template match="/" name="start">
    <xsl:variable name="startTime" select="date:getTime(date:new())"/>
    <xsl:message> + [DEBUG] Start time: <xsl:value-of
select="$startTime"/> milliseconds</xsl:message>
    <xsl:for-each select="1 to 100000000">
      <xsl:variable name="foo" select="."/>
      <xsl:sequence select="$foo"/>
    </xsl:for-each>
    <xsl:variable name="endTime" select="date:getTime(date:new())"/>
    <xsl:message> + [DEBUG] End time: <xsl:value-of select="$endTime"/>
milliseconds</xsl:message>
    <xsl:variable name="elapsed" as="xs:integer" select="$endTime -
$startTime"/>
    <xsl:message> + [DEBUG] Elapsed time: <xsl:value-of select="$elapsed
div 1000"/> seconds</xsl:message>

  </xsl:template>
  
</xsl:stylesheet>


Which produces this result for me when run from Oxygen:

+ [DEBUG] Start time: 1415293570616
+ [DEBUG] End time: 1415293596900
+ [DEBUG] Elapsed time: 26.284 seconds

Cheers,


E.
—————
Eliot Kimber, Owner
Contrext, LLC
http://contrext.com




On 11/6/14, 9:05 AM, "Costello, Roger L. costello(_at_)mitre(_dot_)org"
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:

Order of evaluation is undefined in XSLT, and there is no guarantee
that $start is evaluated before the apply-templates call is evaluated.

Yikes!

So how do I write the XSLT program so that it is guaranteed that $start
will be evaluated before the apply-templates call is evaluated?

/Roger

-----Original Message-----
From: Michael Kay mike(_at_)saxonica(_dot_)com
[mailto:xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com]
Sent: Thursday, November 06, 2014 9:49 AM
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: Re: [xsl] Here's how to benchmark your XSLT program's execution
time

If this is working, then it's only by chance.

Order of evaluation is undefined in XSLT, and there is no guarantee that
$start is evaluated before the apply-templates call is evaluated.

I think this only works in Saxon because the optimizer treats calls on
extension functions as suspicious, and tries to avoid over-optimizing
them because of potential side-effects.

Michael Kay
Saxonica
mike(_at_)saxonica(_dot_)com
+44 (0) 118 946 5893




On 6 Nov 2014, at 10:20, Costello, Roger L. costello(_at_)mitre(_dot_)org
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:

Hi Folks,

So, you've got an XSLT program that is taking a long time to execute.
You want to find out what part of the program is taking so much time.
You need to insert some start/stop timers into your XSLT. Here's how to
do it:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
               xmlns:date="java:java.util.Date"
               version="2.0">

   <xsl:output method="text" />
   <xsl:output name="text-format" method="text"/>

   <xsl:template match="/">
       <!-- Start a timer -->
       <xsl:variable name="start" select="date:getTime(date:new())" />

       <!-- Do your XSLT processing -->
       <xsl:apply-templates />

       <!-- End the timer -->
       <xsl:variable name="end" select="date:getTime(date:new())" />

       <!-- Log the benchmarking results to a file, time-info.txt -->
       <xsl:result-document href="time-info.txt" format="text-format">
           start: <xsl:value-of select="$start" />
           end: <xsl:value-of select="$end" />
           diff: <xsl:value-of select="$end - $start" />
       </xsl:result-document>

   </xsl:template>

   <xsl:template match="*">
       <!-- Do something -->
       <xsl:text>Hello World </xsl:text>
       <xsl:value-of select="current-dateTime()" />
   </xsl:template>

</xsl:stylesheet>



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