perfsonar development work

["Michael Bischoff" <>]

Hello all,

Sounds like a memory leak(as in unnecessary references to objects that won't 
be used any more
are bening kept) in one of the applications, try using the management console 
to find out
which project is the culprit or else profile the application and track live 
objects.

temp workaround would be to start the jvm with additional varargs.

-Xms512m
-Xmx1024m
-XX:PermSize=512m
-XX:MaxPermSize=1024m

these values are probably ridiculous normal app so tweak it.

a note about these:
"    * Options that begin with -X are non-standard (not guaranteed to be 
supported on all VM
implementations), and are subject to change without notice in subsequent 
releases of the JDK.
    * Options that are specified with -XX are not stable and are not 
recommended for casual
use. These options are subject to change without notice."

but you should probably take that with a pinch of salt -XX:PermSize works for 
as log as I
remember. (on sun jvm's)

Also mind that after a error is thrown the jvm can't guarantee correct 
behaviour any more, so
the first error message is probably bogus.

I hope this helps,

Best regards,

Michael Bischoff

> Dear Perfsonar Developers,
>
>
> I would like to share with you a temporal error message (or problem)
> that might be due to some recently installed services on URAN.
>
> So far we have LS, hLS, gLS, RRD MA and SQL MA on uran.acad.bg. During
> some tests today Stijn reported the following eXist error message:
>
> --------------------------------------
> XML Parsing Error: no element found
> Location: http://uran.acad.bg:8080/exist/index.xml
> Line Number 1, Column 1:
> ^
> --------------------------------------
>
>
> while tomcat log files were full of the following:
>
> --------------------------------------
> ...
> SEVERE: Servlet.service() for servlet Cocoon threw exception
> java.lang.OutOfMemoryError: PermGen space
> Jun 5, 2008 4:47:14 PM org.apache.catalina.core.StandardWrapperValve invoke
> SEVERE: Servlet.service() for servlet XQueryServlet threw exception
> java.lang.OutOfMemoryError: PermGen space
> Jun 5, 2008 4:48:34 PM org.apache.catalina.core.ApplicationContext log
> SEVERE: Servlet jsp threw unload() exception
> ...
> --------------------------------------
>
>
> In addition the normal procedure of shutting down tomcat with
> tomcat/bin/shutdown.sh took some minutes (check top.png).
>
> It would be great if you could provide any tips on how to avoid such
> errors in future.
>
> Kind regards,
>
>
> Atanas
>
>