Re: Profiling Tapestry

Hi Luis,

May I ask what JDK you are using?

-mb

----- Original Message ----- 
From: "Luis Neves" <[email protected]>
To: "Tapestry Contrib" <tapestry-contrib-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
Sent: Tuesday, February 19, 2002 10:52 PM
Subject: Re: [Tapestry-contrib] Profiling Tapestry


> 
> I stopped measuring "Elapsed Time" and started measuring "CPU Time" 
> and the results are making more sense, also I pick a very simple page 
> (it's only a static page with a Tapestry BasePage associated) in order 
> do reduce the noise ,and because I've always been curious as to why 
> Tapestry works so hard with pages that are mostly static, I mean, no 
> matter how complex a page is, Tapestry always seems to do the same 
> effort.
> 
> It looks like what's keeping Tapestry down is the use of 
> PrintWriter.
> See:
> 
> <http://pwp.netcabo.pt/lneves/tapestry_Run2.html>
> 
> I remember sometime ago reading a paper from Sun about servlet 
> performance where they conclude (among other things):
> 
> - Converting chars to bytes is *very slow*
> - Always use OutputStream, never PrintWriter
> - Store bytes, not characters
> 
> Ok ... I know ... This is probably preaching to the choir :-)
> The paper is online:
> <http://java.sun.com/javaone/javaone2001/pdfs/551.pdf>
> 
> The problem is of course that PrintWriter may very well be the only 
> thing available that Tapestry can use ... and in that case we are 
> screewed :-)
> 
> 
> Best regards,
> Luis Neves
> 
> 
> 
> ----- Original Message ----- 
> From: "Luis Neves" <[email protected]>
> To: "Tapestry Contrib" <tapestry-contrib-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
> Sent: Tuesday, February 19, 2002 3:38 PM
> Subject: [Tapestry-contrib] Profiling Tapestry
> 
> 
> > 
> > I'm trying out the JProbe profiler suite using a Tapestry Application 
> > ( using a "net.sf.tapestry" filter) and it seems that Tapestry spends 
> > most of the time sleeping :-) , see here:
> > 
> > <http://pwp.netcabo.pt/lneves/tapestry_Run.html>
> > 
> > The big offender seems to be the JanitorThread used by the Tapestry 
> > Pool.
> > Does this make sense? I have no idea of how to interpret the 
> > results... it seems that using a profiler is somekind of a black art.
> > 
> > Best regards,
> > Luis Neves
> > 
> > 
> > -------------------------------------------------------
> > This SF.NET email is sponsored by: Geek Gift Procrastinating?
> > Get the perfect geek gift now!  Before the Holidays pass you by.
> > T H I N K G E E K . C O M      http://www.thinkgeek.com/sf/
> > _______________________________________________
> > Tapestry-contrib mailing list
> > Tapestry-contrib-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> > https://lists.sourceforge.net/lists/listinfo/tapestry-contrib
> 
> 
> -------------------------------------------------------
> This SF.NET email is sponsored by: Geek Gift Procrastinating?
> Get the perfect geek gift now!  Before the Holidays pass you by.
> T H I N K G E E K . C O M      http://www.thinkgeek.com/sf/
> _______________________________________________
> Tapestry-contrib mailing list
> Tapestry-contrib-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> https://lists.sourceforge.net/lists/listinfo/tapestry-contrib



-------------------------------------------------------
This SF.NET email is sponsored by: Geek Gift Procrastinating?
Get the perfect geek gift now!  Before the Holidays pass you by.
T H I N K G E E K . C O M      http://www.thinkgeek.com/sf/