[Building Sakai] Perm Gen Space Error

[Berg, Alan]

PermGen cant be GC'ed as it stores things such as string caches, reflected objects and the definition of classes. Tools such as Jconsole can help you observe PermGen space live. If you start up a server and make sure all the tools have run once then you can probably get a good idea of where the low water mark is. I agree with Doreen that to tweak you should setup -XX:MaxPermSize in your strtup script. 512 MB is a good start value.

Alan

Alan Berg
QA Director - The Sakai Foundation

Senior Developer / Quality Assurance
Group Education and Research Services
Central Computer Services
University of Amsterdam

http://home.uva.nl/a.m.berg
________________________________
From: sakai-dev-bounces at collab.sakaiproject.org [sakai-dev-bounces at collab.sakaiproject.org] on behalf of Anand Mehta [anand.mehta at yahoo.com]
Sent: 12 November 2010 17:53
To: Doreen Minich; sakai-dev at collab.sakaiproject.org
Subject: Re: [Building Sakai] Perm Gen Space Error

Hi Doreen,

Please make sure that -XX:MaxPermSize is set to at least 512MB in Tomcat's bin/setenv.sh file.

Thanks,
Anand


________________________________
From: Doreen Minich <DMinich at messiah.edu>
To: sakai-dev at collab.sakaiproject.org
Sent: Fri, November 12, 2010 7:34:34 AM
Subject: [Building Sakai] Perm Gen Space Error


Good Morning,

Who has some suggestions to resolve a PermGen space error issue we continue to have on our server?  Seems we can keep our server up for two weeks straight without it crashing on the following error.  It's so bad we've started to keep a calendar and log the crashes.

One of my co-workers has been working on this and has implemented many of the suggestions but nothing has been a fix yet.  We're hoping for new, not yet tried solutions that will be our final fix.  I've included a bunch of information below that may or may not be helpful.

.....

This information will automatically be included in your bug report.

org.sakaiproject.portal.api.PortalHandlerException: org.sakaiproject.tool.api.ToolException: PermGen space
    at org.sakaiproject.portal.charon.SkinnableCharonPortal.doGet(SkinnableCharonPortal.java:768)
caused by: org.sakaiproject.tool.api.ToolException: PermGen space
    at org.sakaiproject.portal.charon.SkinnableCharonPortal.forwardTool(SkinnableCharonPortal.java:1221)
caused by: javax.servlet.ServletException: PermGen space
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
caused by: javax.faces.FacesException: PermGen space
    at org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHandlerImpl.java:211)
caused by: org.apache.jasper.JasperException: PermGen space
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
caused by: javax.servlet.ServletException: PermGen space
    at
 org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:774)
caused by: java.lang.OutOfMemoryError: PermGen space


user: admin

usage-session: 76934120-87c7-4ca7-a4bb-c769fdff82c4

time: Nov 11, 2010 08:48:02

Above error copied from Gradebook. Same message visible in Calendar (on Home Page).  Users reporting slow response time.

Available Memory: 238225096 (as listed in Admin Workspace/Memory)

>From Services
Mem: 4083952k total, 3739424k used, 344528 free, 580704k buffers
Swap: 4192924 total, 56k used, 4192868k free, 1146636k cached
java virt 1619m, 1.5g res, 21m shr, %cpu 3, %MEM 38.5

I Reset All Caches (Admin Workspace/Memory)
Memory: 445121856
Reset of cache had no affect on PermGen Space Error
Java CPU % over 100 now

139 Sessions listed

TIA, Dorie

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