Turning on Saxon performance analysis in eXist-db

lschult2 0
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I've used the performance analysis tool in Saxon (https://www.saxonica.com/documentation11/index.html#!using-xsl/performanceanalysis) to analyze stylesheets, and it's quite useful. I'd like to do the analysis from within eXist-db rather than the command line. For one, the performance could be different. But mainly because some stylesheets open documents in exist-db, and I can't run these from the command line. Is there a way to configure Saxon to output the profile.html document when it's run via eXist-db?

I was hoping there would be an attribute in conf.xml , or attributes that could be sent via transform:transform(), but I don't see any options related to the performance analysis tool.

saxon exist-db
2 Answers

I can't be certain this will work, but it's worth a try.

The $attributes parameter of Exist-db's transform() method allows you to set Saxon configuration properties. The available properties are listed at https://www.saxonica.com/documentation11/index.html#!configuration/config-features . You could try setting the properties TRACE_LISTENER_CLASS (to "net.sf.saxon.trace.TimingTraceListener") and TRACE_LISTENER_OUTPUT_FILE (to the required "profile.html" output file).

Incidentally, note that the performance is going to be different when you run with a trace listener. The profile generated using -TP is useful because it tells you which templates and functions are accounting for the most time and therefore need attention; the absolute numbers are not important or accurate. The hot spots will almost certainly be the same whether you are running within eXist or from the command line.

Michael Kay0

I can confirm this did work. Here's the XQL I used:

let $params := 
    <parameters>
    </parameters>
let $attributes := 
    <attributes>
        <attr name="http://saxon.sf.net/feature/traceListenerClass" value="net.sf.saxon.trace.TimingTraceListener"/>
        <attr name="http://saxon.sf.net/feature/traceListenerOutputFile" value="/tmp/profile.html"/>
    </attributes>
let $serialization := 'method=html5 media-type=text/html indent=no'
return transform:transform($xml, $xsl, $params, $attributes, $serialization)
lschult20
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