Hi,
I've run a profile with yourkit (nice!) on my development platform.
Here is the most important evidence. I've opened three product
listings and a couple of product sheet in my site. Total garbage
collected : 234 MB.
Of these 234 MB, 64 are produced by
org.jboss.remoting.transport.socket.ServerThread.run() so they are
related to communication between the business layer and the
presentation layer.
Most of the other (156MB) are produced by
com.opensymphony.xwork2.DefaultActionInvocation.invoke() so it's
something related to struts.
Going down the stack trace through interceptors the "last class" is
org.apache.struts2.dispatcher.StrutsResultSupport.execute
(ActionInvocation) that has 146MB of generated garbage.
Now the interesting part :
These 146MB are divided into :
34MB generated by freemarker.template.Template.process(Object, Writer)
22MB generated by
com.opensymphony.xwork2.util.OgnlValueStack.findValue(String)
10MB generated by org.eclipse.jdt.internal.compiler.Compiler.compile
(ICompilationUnit[])
7MB generated by freemarker.template.Configuration.getTemplate(String)
6MB generated by org.eclipse.jdt.internal.compiler.Compiler.<init>
(INameEnvironment, IErrorHandlingPolicy, Map, ICompilerRequestor,
IProblemFactory, boolean)
and a few other with less then 3MB each.
You can find the complete trace on http://www.andreavettori.com/trace/
trace1.html.
Do they seems normal numbers ???
I also don't understand if the difference between 146 and about 90
(=34+22+10+7+6+other small) is produced by
org.apache.struts2.dispatcher.StrutsResultSupport.execute
(ActionInvocation). That's over 50MB!
Now if someone think that this can help solve my problem and
understand where is produced this garbage I can run the same profile
on the production server, maybe for a couple of minutes.
I'm also really interested into knowing if you guys have ever checked
gc collections on your applications... I don't think I'm the only one
that writes "garbage producer applications" :).
Thank you and please don't leave me alone with this problem!
--
Ing. Andrea Vettori
Consulente per l'Information Technology
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