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Subject: Reasons for perfomance decline - ideas wanted
From: Thorsten Scherler <thorsten.scherler.ext@juntadeandalucia.es>
To: dev@cocoon.apache.org
Cc: "dev@forrest" <dev@forrest.apache.org>
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Date: Fri, 30 Jan 2009 14:05:11 +0100
Message-Id: <1233320711.7002.22.camel@eric>
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Hi all,

I am trying to find out why one of my projects suffer perfomance
declines.

I opened an issue around the problem
https://issues.apache.org/jira/browse/FOR-1157 and added some testing
file to
https://svn.apache.org/repos/asf/forrest/branches/dispatcher_rewrite/FOR-11=
57

Both wars are basically the same but have some minor difference, mainly
the dispatcher library and its dependencies. However I debugged both
versions and tested with different tests. The most important match I am
debugging is the following:

<map:match pattern=3D"**.html">=20
 <map:generate src=3D"lm://resolve.structurer.{1}" type=3D"jx">=20
  <map:parameter name=3D"lenient-xpath" value=3D"true"/>=20
  <map:parameter name=3D"getRequest" value=3D"{1}"/>=20
  <map:parameter name=3D"contextPath" value=3D"{request:contextPath}"/>=20
  <map:parameter name=3D"getRequestExtension" value=3D"html"/>=20
 </map:generate>=20
<!--=20
  1) <map:serialize type=3D"xml"/>=20
-->=20
 <map:transform type=3D"dispatcher">=20
  <map:parameter name=3D"cacheKey" value=3D"{0}"/>=20
  <map:parameter name=3D"validityFile"
value=3D"lm://resolve.structurer.{1}"/>=20
  <map:parameter name=3D"request" value=3D"{1}"/>=20
  <map:parameter name=3D"type" value=3D"html"/>=20
 </map:transform>=20
<!--=20
  2) <map:serialize type=3D"xhtml"/>=20
-->=20
 <map:transform src=3D"lm://hooks-to-html.xsl"/>=20
<!--=20
  3) <map:serialize type=3D"xhtml"/>=20
-->=20
 <map:transform src=3D"lm://namespace-stripped"/>=20
<!--=20
  4) <map:serialize type=3D"xhtml"/>=20
-->=20
 <map:transform src=3D"lm://strip-dispatcher-remains-html.xsl"/>=20
 <map:serialize type=3D"xhtml"/>=20
</map:match>

In one test I cut the pipeline after the generator (1) and the result is
surprising. Since there is NO difference between the old and new version
in the generator I was awaiting that the performance should be the same.

But 55,5 (new) vs. 64,5 (old) are not even close to be the same. I do
not see any reason for performance penalty since I am not actually
testing my development but a general component that did not changed at
all.

Has anybody an idea what the reason for the performance decline can be?

salu2
--=20
Thorsten Scherler <thorsten.at.apache.org>
Open Source Java <consulting, training and solutions>

Sociedad Andaluza para el Desarrollo de la Sociedad=20
de la Informaci=C3=B3n, S.A.U. (SADESI)