Re: Profiling Tapestry

This may also mandate that Tapestry only support utf-8 as a character
encoding.

----- Original Message -----
From: "Luis Neves" <[email protected]>
To: "Tapestry Contrib" <tapestry-contrib-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
Sent: Friday, December 20, 2002 7:35 AM
Subject: Re: [Tapestry-contrib] Profiling Tapestry


>
> On Friday, December 20, 2002 11:33 AM, Howard M. Lewis Ship wrote:
>
> > I agree with Marlcom; test under load in a real application.  I'm fairly
> > confident that once you add any EJB or database access, the whole
Tapestry
> > slice of the pie will become pretty thin.
>
> I think you (and Malcom) are downplaying the impact of the web
> presentation framework in the overall performance of an application,
> which I think is a huge mistake.
>
> I already tested Tapestry "real applications" under load, and I can
> assure you that your confidence is misguided, Tapestry applications
> absolutely collapse under load.
> And not only in laboratory conditions, I see this every day at work.
>
> We have an application (no EJB, simple database access) that people
> use to book the lunch at the cafeteria (they browse the menu and make
> a choice) and every day between 11:30-12:00 the web server CPU
> get pegged at 100% trying to handle requests for about 3500 users,
> while the database server just sits pretty with a 1.1 load average.
> This didn't happened when the application was written in PHP, and
> didn't happen when the application was written in JSP.
>
>
> > I do think that, with enough work, we could do a lot less
unicode-to-ascii
> > conversions.  That is, template objects (RenderTemplateHTML instances)
> could
> > do the conversion just once and emit ascii-binary after that ... but its
a
> > lot of work.  I'd want to see that this conversion is really causing a
> > visible hotspot when the application is running under load.
>
> What proof do you need? ... I already profiled a Tapestry application
> and "PrintWriter" appears to be the culprit and I showed you 2
> articles that say that use of "PrintWriter" is do be avoided and that
> char to byte conversions are slow.
>
> Please don't get me wrong, I love Tapestry, I wouldn't want to use
> anything else and I do understand that you have lots of other stuff in
> your plate, but Tapestry does have a performance problem, and saying
> that "EJB and database access" will eclipse that is just wishful
> thinking.
>
> Best regards,
> Luis Neves
>
>
>
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