On Wed, Jul 14, 2010 at 8:45 PM, Jeremy Boynes <jboy...@apache.org> wrote: > On Jul 12, 2010, at 7:04 PM, Jeremy Boynes wrote: > >> I'm going to ping Xalan about the increase in time taken as expressions are >> evaluated as I would assume I'm doing something silly. > > I looked into the Xalan implementation and the problem appears to be in > creation of the DTM used by the underlying implementation. To evaluate the > expression it walks up the DOM tree to the parent and then iterates forward > over the tree until it reaches the initial context node. This leads to a > linear increase in execution time as the context node progresses through the > NodeList from the <forEach>. > > I changed <x:forEach> and <x:out> to use Jaxen and did not see this issue. > The execution time for xpath evalutation over 1000 iterations was constant > and substantially faster than with Xalan: total of 62ms reparsing each time > or 21ms if precompiled, down from 1800ms. > > In light of this I'd like to propose we switch to Jaxen and add it as a > dependency.
Absolutely: +1 Great work :) Hen --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@tomcat.apache.org For additional commands, e-mail: dev-h...@tomcat.apache.org
