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From "Vadim Gritsenko" <vadim.gritse...@verizon.net>
Subject RE: c2: scales badly compared to c1
Date Sat, 09 Feb 2002 15:08:31 GMT
> From: Stefano Mazzocchi [mailto:stefano@apache.org]
> 
> Alexandre Victoor wrote:
> >
> > Hi,
> >
> > I am also migrating from C1 to C2. I have tried to migrate changing
as lessc
> >  ode as possible. I have noticed that if I use a very basic
generator,
> > which doesn't use the avalon framework, the amount of memory used by
cocoonk
> >  eep increasing at each request. Well that's quite normal I guess
since myg
> >  enerator can't be recycled...
> 
> Yes, you have to use the appropriate Avalon marking interfaces
> (Recyclable, etc...) in order to have it recycled. Otherwise, the
memory
> keeps increasing because new instances of that component has to be
> created.
> 
> > The real bad thing that I can reproached to C2 is the amount of
memory usedb
> >  y the sitemap. Even with a simple one, about 30MB of memory are
used... Ist
> >  here a way to reduce this amount ?
> 
> This memory is not taken up by Cocoon but by Javac since the sitemap
> gets compiled. It is likely that 90% of this memory is garbage and
will
> be collected next time the JVM will need memory and before increasing
> the heap size.
> 
> Anyway, we are aware of this problem and next release (2.0.2) will
> include another java compiler (pizza) which will reduce the amount of
> memory used to compile things (both sitemap and XSP) and reduce the
> cocoon startup time (since less classes needs to be loaded, the pizza
> jar is about 500Kb compared to the 4mb of javac)
> 
> Finally: yes, Cocoon 2.x is less polished than Cocoon 1.x but expect
> better performances (both runtime and loadtime) and memory footprint
(at
> startup and under load).

In addition to this: Cocoon *requires* tuning in order to make it work
fast. Search for "performance", "tuning" in the users and developers
email archives, it was discussed couple of times but not documented.

PS: Tuning could be for: memory, high concurrent users load, startup
time, etc.

Vadim


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