I think what you are experiencing with 2.2.x is the adaptation of the DOM
to the internal DTM. In 2.2.x we made a performance tradeoff between
transforms from streams and SAX events, vs. DOM transformations. (On the
other hand, some DOM transformations will actually be much faster.)
If you can provide a complete unit test that replicates the problem, I
would be interested in doing some performance profiling to see if there's
anything that can be done.
-scott
SerCon_FischerS@WestLB-
Systems.de To: [EMAIL PROTECTED]
cc: (bcc: Scott Boag/CAM/Lotus)
08/28/01 08:34 AM Subject: Performance degredation
from Xalan-J 2.1 to 2.2
Please respond to
xalan-dev
Hello,
this is more supposed to be mailed to a users list, but I haven't found
one.
We recently upgraded our production environment (Websphere 3.5, JDK 1.2.2
and Xerces 1.4.2) from Xalan 2.1 to 2.2 D6 and experienced a major
performance problem with this upgrade.
Transformations that took around 3 seconds now take 6-8 seconds.
We have cached Template objects that we use for transforming multiple
DOMSources from a JSP.
Transformer transformer =Cache.getTransformer(someThing);
StreamResult streamResult = new StreamResult(out);
DOMSource domSource = new DOMSource();
for (int i=0; i<invList.size(); i++) {
transformer.clearParameters();
doc = (Document) invList.get(i);
domSource.setNode(doc);
transformer.transform( domSource, streamResult);
}
We experimented with setting the features from the DTM: "
http://xml.apache.org/xalan/features/incremental"; and
"http://xml.apache.org/xalan/features/optimize"; with no performance gains.
We also tried release 2.2 D9 but this shows the same effect.
Can anyone help? Thanks!
Kind regards,
Steffen
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