Hi Tim, thanks for your answer.
I'd like your opinion about the amount of memory needed for a repository
with about 20000 items. Maybe 2GB for the heap isn't enough (the PermGem
has a limit of 256MB).
Now, I wonder why tomcat log those errors when I stop it ( The web
application [] created a ThreadLocal with key of type
[java.lang.ThreadLocal] (value [java.lang.ThreadLocal@**4b70ca96]) and a
value of type [org.apache.cocoon.**serialization.XMLSerializer] (value
[org.apache.cocoon.**serialization.XMLSerializer@**5a04648b]) but failed to
remove it when the web application was stopped. This is very likely to
create a memory leak.).
Also, assuming 2GB is enough heap memory, it's at least suspect that the
Old Gen memory keeps growing up to the memory limit and never gets Garbage
collected ...
Regards.
Nestor
On Thu, May 17, 2012 at 11:11 AM, Tim Donohue <tdono...@duraspace.org>wrote:
> Hi Nestor,
>
> Which type of "OutOfMemory" error do you sometimes see in your Tomcat
> logs? There are two possible "OutOfMemoryErrors" you may encounter:
>
> (1) java.lang.OutOfMemoryError: Java heap space
>
> This one means you may need to tweak the -Xmx and/or -Xms settings for
> Tomcat (though it looks like you may already be doing that).
>
>
> (2) java.lang.OutOfMemoryError: PermGen space
>
> This one means that you need to increase the "-XX:MaxPermSize" settings
> for Tomcat.
>
> For more information on both OutOfMemory errors, and how you can tweak
> your Tomcat memory settings see:
> https://wiki.duraspace.org/**display/DSDOC18/Performance+**Tuning+DSpace<https://wiki.duraspace.org/display/DSDOC18/Performance+Tuning+DSpace>
>
> - Tim
>
>
> On 5/17/2012 8:03 AM, Nestor Oviedo wrote:
>
>> Hi all.
>> We have a Dspace 1.8.2 (with our extensions), and almost 20000 items and
>> 1000 collections/communities. Our Tomcat 6 get started with -Xmx=2GB
>> (Java 1.6.0_26 64bit).
>> When tomcat starts everything work fine, but after a few hours the
>> memory is full and the application gets unresponsive. Some times we see
>> an OutOfMemory error in the log.
>> When we stop the tomcat, the log shows thousands of lines like the
>> following (with many different types and values):
>>
>> org.apache.catalina.loader.**WebappClassLoader clearReferencesThreads
>> GRAVE: The web application [] appears to have started a thread named [**
>> MultiThreadedHttpConnectionMan**ager cleanup] but has failed to stop it.
>> This is very likely to create a memory leak.
>>
>> org.apache.catalina.loader.**WebappClassLoader clearReferencesThreads
>> GRAVE: The web application [] appears to have started a thread named
>> [Timer-0] but has failed to stop it. This is very likely to create a memory
>> leak.
>>
>> org.apache.catalina.loader.**WebappClassLoader clearThreadLocalMap
>> GRAVE: The web application [] created a ThreadLocal with key of type
>> [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@**29a9b1ec]) and a
>> value of type [org.apache.xerces.parsers.**SAXParser] (value
>> [org.apache.xerces.parsers.**SAXParser@8a61d64]) but failed to remove it
>> when the web application was stopped. This is very likely to create a
>> memory leak.
>>
>> org.apache.catalina.loader.**WebappClassLoader clearThreadLocalMap
>> GRAVE: The web application [] created a ThreadLocal with key of type
>> [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@**43e01252]) and a
>> value of type [org.dspace.app.xmlui.wing.**IncludePageMeta] (value
>> [org.dspace.app.xmlui.wing.**IncludePageMeta@2bd2e84e]) but failed to
>> remove it when the web application was stopped. This is very likely to
>> create a memory leak.
>>
>> org.apache.catalina.loader.**WebappClassLoader clearThreadLocalMap
>> GRAVE: The web application [] created a ThreadLocal with key of type
>> [null] (value [null]) and a value of type [org.apache.cocoon.**
>> transformation.**TraxTransformer] (value [org.apache.cocoon.**
>> transformation.**TraxTransformer@23916f5c]) but failed to remove it when
>> the web application was stopped. This is very likely to create a memory
>> leak.
>>
>> org.apache.catalina.loader.**WebappClassLoader clearThreadLocalMap
>> GRAVE: The web application [] created a ThreadLocal with key of type
>> [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@**21261342]) and a
>> value of type [org.apache.cocoon.components.**xslt.TraxProcessor] (value
>> [org.apache.cocoon.components.**xslt.TraxProcessor@4aba630e]) but failed
>> to remove it when the web application was stopped. This is very likely to
>> create a memory leak.
>>
>> org.apache.catalina.loader.**WebappClassLoader clearThreadLocalMap
>> GRAVE: The web application [] created a ThreadLocal with key of type
>> [org.apache.solr.common.util.**DateUtil.**ThreadLocalDateFormat] (value
>> [org.apache.solr.common.util.**DateUtil$**ThreadLocalDateFormat@12bd5276*
>> *]) and a value of type [java.text.SimpleDateFormat] (value
>> [java.text.SimpleDateFormat@**5af7aed5]) but failed to remove it when
>> the web application was stopped. This is very likely to create a memory
>> leak.
>>
>> org.apache.catalina.loader.**WebappClassLoader clearThreadLocalMap
>> GRAVE: The web application [] created a ThreadLocal with key of type
>> [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@**4b70ca96]) and a
>> value of type [org.apache.cocoon.**serialization.XMLSerializer] (value
>> [org.apache.cocoon.**serialization.XMLSerializer@**5a04648b]) but failed
>> to remove it when the web application was stopped. This is very likely to
>> create a memory leak.
>>
>>
>> I've found some old info about this issue, but it seems there is no fix:
>> http://www.mail-archive.com/**dspace-tech@lists.sourceforge.**
>> net/msg11969.html<http://www.mail-archive.com/dspace-tech@lists.sourceforge.net/msg11969.html>
>> http://dspace.2283337.n4.**nabble.com/Tomcat-memory-leak-**
>> warning-prevents-restarting-**td3544827.html<http://dspace.2283337.n4.nabble.com/Tomcat-memory-leak-warning-prevents-restarting-td3544827.html>
>> http://stackoverflow.com/**questions/5292349/this-is-**
>> very-likely-to-create-a-**memory-leak-tomcat<http://stackoverflow.com/questions/5292349/this-is-very-likely-to-create-a-memory-leak-tomcat>
>>
>> Is there somenting new on this issue?
>>
>> Thanks in advance
>> Nestor
>>
>>
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>>
>>
>>
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