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From "Vadim Gritsenko" <vadim.gritse...@verizon.net>
Subject RE: C2 Bug Locating Tips
Date Thu, 14 Mar 2002 17:47:12 GMT
Stuart,

TreePorcessor is quite new thing and I'm not quite sure that anybody
spent time on finding memory leaks. Do you have leaks if you use
compiled sitemap? Try also old FS store instead of Jisp.


> > HttpProcessor[8080][4]/DefaultComponentFactory: ComponentFactory
> > decommissioning instance of
> > org.apache.cocoon.components.treeprocessor.CategoryNodeBuilder.
> 
> Is this important?

This one should better be answered by Sylvain.


Vadim

> -----Original Message-----
> From: Stuart Roebuck [mailto:stuart.roebuck@adolos.co.uk]
> Sent: Thursday, March 14, 2002 12:39 PM
> To: cocoon-dev@xml.apache.org
> Subject: Re: C2 Bug Locating Tips
> 
> 
> On Thursday, March 14, 2002, at 04:34 pm, Vadim Gritsenko wrote:
> 
> >> From: Stuart Roebuck [mailto:stuart.roebuck@adolos.co.uk]
> >>
> >> My setup is:
> >> 		Cocoon 2 (latest CVS) - but problems have occurred for a
> > month
> >> or so now.
> >> 		Tomcat 4.0.1
> >> 		Mac OS X 10.1.3 (latest Java release) - but problems
> > occurred
> >> before it.
> >>
> >> After a modest amount of Cocoon action, I get an OutOfMemoryError
in
> > the
> >> Tomcat localhost_log (see below) and to be completely honest, I
> > haven't
> >> much of a clue how I'm going to track down the associated memory
leak.
> >>
> >> I'm now using the Pizza compiler, so the associated Javac memory
leak
> >> shouldn't be there.
> >>
> >> I've reduced the store-janitor heapsize value from the default
> > 67108864
> >> to 60000000 running from a default Mac OS X Java configuration of
64Mb
> >> max heap and this appears to delay the onset of problems.
> >>
> >> The problems weren't present in the past, and we currently have a
> >> pre-release site <http://www.cueandreview.co.uk/> running on an
older
> >> Cocoon 2 release which doesn't exhibit this behaviour.  It's
running
> > off
> >> a FreeBSD based machine, but it was developed without problems on
Mac
> > OS
> >> X (with the release of Cocoon it is running on on FreeBSD).
> >>
> >> So I'm inclined to think that the problem is something that has
been
> >> introduced in Cocoon, rather than anything platform specific or
> >> sitemap / processing specific - but I could be wrong.
> >
> > Still, for anyone to debug your leak, one has to know what
components
> > you are using. Some components could have memory leak, while others
do
> > not. So, /please provide list of used components/ :)
> 
> Here goes:
> 
> 	Generators:
> 		FileGenerator
> 		ServerPagesGenerator
> 		DirectoryGenerator
> 		RequestGenerator (not sure if we use that one at the
moment)
> 		ImageDirectoryGenerator
> 
> 	Transformers:
> 		TraxTransformer
> 
> 	Serializers:
> 		XMLSerializer
> 		HTMLSerializer
> 
> 	Readers:
> 		ResourceReader
> 
> 	Matchers:
> 		WildcardURIMatcher
> 		RequestParameterMatcher
> 		WildcardSessionAttributeMatcher
> 		WildcardHeaderMatcher
> 
> 	Actions:
> 		DatabaseAddAction
> 		DatabaseDeleteAction
> 		DatabaseUpdateAction
> 		RequestParamAction
> 		UserAction (inhouse)
> 		SessionParamAction (inhouse)
> 
> 
> >
> >> Significant things that have changed (and are being used) between
the
> >> reliable version and the current include:
> >> 	Xerces 1.4.4 --> Xerces 2.0.x
> >> 	TreeProcessor
> >> 	JispStore
> >> 	Pizza compiler
> >>
> >> This may or may not be connected with:
> >>
> >> 	<http://nagoya.apache.org/bugzilla/show_bug.cgi?id=6868>
> >
> > I fail to see connection...
> 
> Because I don't have much of a clue about what's going wrong I always
> think its important to refer to anything else that's not working
> properly - until I know what's wrong there might be a connection.
> 
> >> Any thoughts, hints, suggestions?
> >
> > *Memory leak debugging how-to:*
> >
> > 1. Download trial of OptimizeIt
> > 2. Decrease pool sizes to the minimum
> > 3. Launch Tomcat/Cocoon
> > 4. Exercise app for a while
> > 5. Run gc several times (button on OptimizeIt's toolbar)
> > 6. Click on "mark"
> > 7. Access one URL once
> > 8. Repeat 5
> > 9. Sort by object count difference
> > 10. View allocation backtraces of the objects which count increased.
> > 11. Repeat 5-10 for all URLs.
> >
> > If everywhere you see +0 - no memory leaks found.
> 
> Thanks, that looks very useful, now I've just got to persuade
OptimizeIt
> to renew my Trial - the last one ran out before I got round to trying
it!
> 
> One last point - this may or may not be connected (my apologies if it
> isn't).
> 
> In previous correspondence Sylvain said:
> > search for messages such as "decommissioning instance of...". This
> > reveals some undersized pools which are corrected by tuning
> > cocoon.xconf and sitemap.xmap. Undersized pools act like an object
> > factory, plus the ComponentManager overhead.
> 
> I seem to recall that there was some discussion on the relative merits
> of pools over object factories for short-lived small setup objects, so
> this may not be relevent, but my sitemap log is full of entries like
> this:
> 
> > DEBUG   (2002-03-14) 16:58.56:617   [sitemap](/styles.css)
> > HttpProcessor[8080][4]/DefaultComponentFactory: ComponentFactory
> > decommissioning instance of
> >
org.apache.cocoon.components.treeprocessor.sitemap.HandleErrorsNodeBuild
er.
> > DEBUG   (2002-03-14) 16:58.56:618   [sitemap](/styles.css)
> > HttpProcessor[8080][4]/DefaultComponentFactory: ComponentFactory
> > decommissioning instance of
> >
org.apache.cocoon.components.treeprocessor.NamedContainerNodeBuilder.
> > DEBUG   (2002-03-14) 16:58.56:619   [sitemap](/styles.css)
> > HttpProcessor[8080][4]/DefaultComponentFactory: ComponentFactory
> > decommissioning instance of
> > org.apache.cocoon.components.treeprocessor.CategoryNodeBuilder.
> > DEBUG   (2002-03-14) 16:58.56:620   [sitemap](/styles.css)
> > HttpProcessor[8080][4]/DefaultComponentFactory: ComponentFactory
> > decommissioning instance of
> >
org.apache.cocoon.components.treeprocessor.sitemap.ActionSetNodeBuilder.
> > DEBUG   (2002-03-14) 16:58.56:620   [sitemap](/styles.css)
> > HttpProcessor[8080][4]/DefaultComponentFactory: ComponentFactory
> > decommissioning instance of
> > org.apache.cocoon.components.treeprocessor.CategoryNodeBuilder.
> > DEBUG   (2002-03-14) 16:58.56:621   [sitemap](/styles.css)
> > HttpProcessor[8080][4]/DefaultComponentFactory: ComponentFactory
> > decommissioning instance of
> > org.apache.cocoon.components.treeprocessor.sitemap.MountNodeBuilder.
> > DEBUG   (2002-03-14) 16:58.56:621   [sitemap](/styles.css)
> > HttpProcessor[8080][4]/DefaultComponentFactory: ComponentFactory
> > decommissioning instance of
> >
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNodeBuilder.
> > DEBUG   (2002-03-14) 16:58.56:622   [sitemap](/styles.css)
> > HttpProcessor[8080][4]/DefaultComponentFactory: ComponentFactory
> > decommissioning instance of
> > org.apache.cocoon.components.treeprocessor.sitemap.ViewNodeBuilder.
> > DEBUG   (2002-03-14) 16:58.56:623   [sitemap](/styles.css)
> > HttpProcessor[8080][4]/DefaultComponentFactory: ComponentFactory
> > decommissioning instance of
> >
org.apache.cocoon.components.treeprocessor.sitemap.SitemapNodeBuilder.
> > DEBUG   (2002-03-14) 16:58.56:623   [sitemap](/styles.css)
> > HttpProcessor[8080][4]/DefaultComponentFactory: ComponentFactory
> > decommissioning instance of
> >
org.apache.cocoon.components.treeprocessor.sitemap.SelectNodeBuilder.
> > DEBUG   (2002-03-14) 16:58.56:624   [sitemap](/styles.css)
> > HttpProcessor[8080][4]/DefaultComponentFactory: ComponentFactory
> > decommissioning instance of
> >
org.apache.cocoon.components.treeprocessor.sitemap.PipelineNodeBuilder.
> > DEBUG   (2002-03-14) 16:58.56:624   [sitemap](/styles.css)
> > HttpProcessor[8080][4]/DefaultComponentFactory: ComponentFactory
> > decommissioning instance of
> > org.apache.cocoon.components.treeprocessor.sitemap.ReadNodeBuilder.
> > DEBUG   (2002-03-14) 16:58.56:625   [sitemap](/styles.css)
> > HttpProcessor[8080][4]/DefaultComponentFactory: ComponentFactory
> > decommissioning instance of
> > org.apache.cocoon.components.treeprocessor.CategoryNodeBuilder.
> 
> Is this important?
> 
> Stuart.
> 
>             Public Key - 1024D/88DD65AF 2001-11-23 Stuart Roebuck
(Adolos)
>       Key fingerprint = 89D9 E405 F8B1 9B22 0FA2  F2C1 9E57 5AB1 88DD
65AF
>
------------------------------------------------------------------------
-
> Stuart Roebuck
stuart.roebuck@adolos.com
> Systems Architect                             Java, XML, MacOS X, XP,
> etc.
> ADOLOS
<http://www.adolos.com/>
> 
> 
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