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From Ovidiu Predescu <ovi...@cup.hp.com>
Subject Re: LoadTest
Date Wed, 22 Aug 2001 23:24:09 GMT
Vadim,

Are the recent changes applied to main trunk as well as to
cocoon_20_branch?

Thanks,
Ovidiu

On Wed, 22 Aug 2001 19:02:39 -0400, "Vadim Gritsenko" <vgritsenko@yahoo.com> wrote:

> Marcus,
> Do not use cocoon20b2 - this is really old beta release!
> Switch to cocoon_20_branch - that's the RC Berin is talking about.
> 
> Vadim
> 
> > -----Original Message-----
> > From: Marcus Crafter [mailto:crafterm@fztig938.bank.dresdner.net]
> > Sent: Wednesday, August 22, 2001 6:58 PM
> > To: cocoon-dev@xml.apache.org
> > Subject: Re: LoadTest
> > 
> > 
> > Hi Berin,
> > 
> > 	Hope all is well mate. Thanks again for your advice. Please, don't be
> > 	afraid to give out more! :-)
> > 
> > On Wed, 22 Aug 2001, Berin Loritsch wrote:
> > 
> > > Marcus Crafter wrote:
> > > > 
> > > >         We had a range of errors:
> > > > 
> > > >         o components not found: fixed recently in avalon's DefaultPool
> > > >           (also seems to have improved what was before a memory leak)
> > > 
> > > I'm glad to see this is no longer a problem.  Let me know if it rears
> > > its ugly head again.
> > 
> > 	Sure will. :-)
> > 
> > > >         o decreased performance over time (100 users lasts about 20 minutes,
> > > >           50 users lasts about 40 minutes with our application, before
> > > >           performance drops)
> > > 
> > > What is the load (beyond number of users: time between responses, type
> > > of resource).
> > 
> > 	The load actually changed with today's source code. Thanks to all that
> > 	checked in changes today. Yesterday the load was less on our system
> > 	(averaging between 3 and 6, for 50 and 100 users).
> > 	
> > 	With the changes from today (which have helped dramatically)
> > 	the load is much higher, around 7-14 with the same user counts.
> > 
> > 	Performance in general is actually much better than before, even though
> > 	the machine seems to be under more load.
> > 
> > > Probably should use the cocoon_2_0 branch (check the site for the proper
> > > name).
> > > That is what is being prepared for production readiness.
> > 
> > 	Ok, we've switched over to the cocoon20b2 branch.
> > 
> > > Cocoon.xconf provides attributes to allow you to manipulate
> > > the size of Component pools for Poolable Components:
> > > 
> > > pool-min     // Minimum number of Components in the pool
> > > pool-max     // Maximum number of Components maintained in the pool
> > > pool-grow    // Number of Components to add to the pool each time we run
> > > out.
> > > 
> > > The Pool will basically turn into a Factory when the number of
> > > Components in
> > > the pool exceed pool-max.  This is a performance drain.
> > 
> > 	Ok. Excellent advice. :-)
> > 	
> > 	We pumped up our pool settings and saw an immediate improvement in
> > 	general application performance, especially when testing directly with
> > 	Tomcat (vs via a ajp13 connector).
> > 
> > 	I've increased pooling settings on as much components as I can in our
> > 	cocoon.xconf and sitemap.xmap files (min 32 to max 64 for 50
> > 	simultaneous users).
> > 
> > 	There are still several components which are regularly being
> > 	decommissioned in the log files during our tests, that I cannot find
> > 	locations where I can set pooling parameters for. These are:
> > 
> > 	org.apache.cocoon.components.language.markup.xsp.XSPMarkupLanguage
> > 	org.apache.avalon.excalibur.component.ExcaliburComponentSelector
> > 	
> > 	and all generated xsp classes, eg:
> > 
> > 	org.apache.cocoon.www.client.common.mask.mask_xsp_xml
> > 	(custom generated xsp class).
> > 
> > 	Is it possible to set pooling sizes on these components too ?
> > 
> > > Increase your pool sizes and cache sizes.  If your JVM is not set to use
> > > all 2 gig of RAM, then it will perform garbage collection more often.
> > 
> > 	Yep. Have done already, we're running with mx1526 ms1024m, although I
> > 	missed the MRU settings. I've increased the MRUMemory sizes today from
> > 	60m to 200m (for each event cache, stream cache, and the store).
> > 
> > > >         Runaway threads ? Could cause such a problem, but they wouldn't
allow
> > > >         the system to regain itself - or should I not assume this ?
> > > 
> > > I don't think this is a problem.  You would see your CPU maxed out.
> > 
> > 	I agree. 
> > 
> > > >         Threading issues ? We've also seen cases in the log files under
load
> > > >         where a single (same) request is handled by 4 separate threads,
all
> > > >         starting in the same second - quite vexing.
> > > 
> > > That _might_ be your Servlet Engine.  The last time I ran my tests I
> > > used Caucho's Resin.  It is pretty decent, although it has some
> > > synchronization issues of its own regarding archived files (i.e. jar files).

> > > They are so severe that the entire JVM crashes.
> > 
> > 	Ouch. Ok, I'll try everything with Resin as well, and also with 
> > 	Tomcat 4. BTW - Have you (or anyone else) experienced performance/load
> > 	problems when using the apache connectors at all ?
> > 
> > > >         Our environment is a on a Sun Enterprise 250 (2x450mhz UltraII,
2gig
> > > >         ram), with Tomcat 3.2.3, CVS Cocoon2, and our reporting application
> > > >         (generates various html tables and pdf reports).
> > > 
> > > That sounds very impressive.  Can I have one? ;P
> > 
> > 	Sure, we have 5 of them here :-)
> > 
> > 	That's it so far. Thanks very much for your advice Berin, we'll
> > 	continue to test here with the ideas you and others have laid out with
> > 	the current codebase. As we do more testing I'll send in more
> > 	information.
> > 
> > 	Cheers,
> > 
> > 	Marcus
> > 
> > 
> > -- 
> >         .....
> >      ,,$$$$$$$$$,      Marcus Crafter
> >     ;$'      '$$$$:    Computer Systems Engineer
> >     $:         $$$$:   Open Software Associates GmbH
> >      $       o_)$$$:   82-84 Mainzer Landstrasse
> >      ;$,    _/\ &&:'   60327 Frankfurt Germany
> >        '     /( &&&
> >            \_&&&&'     Email : Marcus.Crafter@osa.de
> >           &&&&.        Business Hours : +49 69 9757 200
> >     &&&&&&&:
> > 
> > 
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