I'm using 5.1.0.0.
But I'm sorry to confuse you all. I'm not trying to profile Tapestry
lowlevel code, I'm trying to profile my own component code :)
I want to know collectively how long any one of my component takes to
render. The reason I think this view of things would be useful, is that
profiling at method level might not give me a clear picture of where to
focus on.. ( we'll see lots of setupRenders. lots of beginRenders, but
no relationship between one component and how it depends on
subcomponents, etc etc)
Do you understand? So it's not profiling Tapestry code precisely, but
profiling pages/components via the view of tapestry's component
rendering tree..
I don't know if it would be ultimately useful, but it sounds like an
interesting idea..
Howard Lewis Ship wrote:
Are you using Tapestry 5.0.18 or 5.1.0.0-SNAPSHOT? I've added some
considerable performance improvements to 5.1.
I would get a copy of YourKit and start profiling to see where the
actual problems are.
Tapestry takes a hit because it renders the entire document to a kind
of light-weight DOM before it can start to stream the output; that's a
lot of churn in the JVM's eden heap space.
On Thu, Jan 15, 2009 at 8:17 PM, Thiago H. de Paula Figueiredo
<thiag...@gmail.com> wrote:
Em Thu, 15 Jan 2009 23:19:56 -0300, Fernando Padilla <f...@alum.mit.edu>
escreveu:
The database was just upgraded and io/cpu is really really low. So that
won't be the case.
I would still check this out . . . Don't forget about one transaction
waiting for others to release locks in table rows . . .
The root cause might be the number of db requests required to render a
page, but the database it self is not the bottle neck. :) :)
A real case I found as a consultant was the lack of attention to Hibernate
mapping options, specially regarding lazy loading of collections. Instead of
using one or two selects to load an entity object and one of its lists, it
was using one for each element in the list. This absolutely kills
performance.
By the way, nice performance improvement hunting! :) Don't forget to share
your experience with us. ;)
--
Thiago H. de Paula Figueiredo
Independent Java consultant, developer, and instructor
http://www.arsmachina.com.br/thiago
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