They also have a section on the same error:
Caveat of the manager application
PermGen info
For a really good description of the issue, see this series of three
articles:
"Return of the PermGen" (2007-09-29)
"PermGen Strikes Back" (2007-03-15)
"Good Riddance PermGen OutOfMemoryError" (2007-03-13)
The dreaded java.lang.OutOfMemoryError: PermGen space failure error:
The issue: The "PermGen" error happens when the JVM runs out of memory
in the permanent generation.
The cause: Objects in the permanent generation are never garbage
collected. When redeploying your web application using the
Tomcatmanager application, your WAR file is unpacked and parts of the
class file definition are loaded into PermGen space, like string
constants.
The symptom: The PermGen error will manifest itself in a sluggish
Tomcat manager application that never completes a task, and
thejava.lang.OutOfMemoryError: PermGen space failure error being
displayed in $TOMCAT_HOME/logs/catalina.out
A temporary fix: You can add the -XX:MaxPermSize switch to $JAVA_OPTS
to increase the amount of memory allocated for the permanent
generation, However this is only postponed the inevitable, as even an
increased memory in permanent generation will eventually fill up. When
this happens, you will need to stop/start Tomcat at this point. For
this reason, you may want to restart Tomcat whenever you redeploy TDS
or another webapp.
-Roy
On Aug 26, 2009, at 8:27 AM, Rich Signell wrote:
THREDDS folk,
I see that these is a TDS tutorial updated August 6 at:
http://www.unidata.ucar.edu/Projects/THREDDS/tech/tutorial/index.html
In the section on "Installing Java and Tomcat" I see that it's
recommended to create a setenv.sh script in the <tomcat>/bin
directory with these options:
JAVA_OPTS="-Xmx256m -Xms256m -server -Djava.awt.headless=true"
I've noticed that on our TDS4 installations, I often get a "PermGen"
error which causes tomcat to hang. On this page:
http://confluence.atlassian.com/display/CONF29/Fix+Out+of+Memory+errors+by+Increasing+Available+Memory#FixOutofMemoryerrorsbyIncreasingAvailableMemory-PermGenSpaceParameters
I read:
Heap space memory errors will contain only a
java.lang.OutOfMemoryError. If you get the error message:
java.lang.OutOfMemoryError: PermGen space this means that you have
exceeded Java's fixed 64Mb block for loading class files. You will
need to add the argument -XX:MaxPermSize=256m to JAVA_OPTS, in
addition to any argument you use to set the heap size.
PermGen Space Parameters
JAVA_OPTS="-Xms128m -Xmx1024m -XX:MaxPermSize=256m -
Djava.awt.headless=true "
So I've set this my setenv.sh file for my Tomcat installation to read:
JAVA_OPTS="-Xms128m -Xmx1024m -server -XX:MaxPermSize=256m -
Djava.awt.headless=true "
I have no idea yet whether this will help, as I just added the
MaxPermSize parameter today. Anybody else have experience with
PermGen problems running TDS4 and know if this should help or how to
avoid in the first place?
Thanks,
Rich
--
Dr. Richard P. Signell (508) 457-2229
USGS, 384 Woods Hole Rd.
Woods Hole, MA 02543-1598
_______________________________________________
thredds mailing list
thredds@xxxxxxxxxxxxxxxx
For list information or to unsubscribe, visit:
http://www.unidata.ucar.edu/mailing_lists/
**********************
"The contents of this message do not reflect any position of the U.S.
Government or NOAA."
**********************
Roy Mendelssohn
Supervisory Operations Research Analyst
NOAA/NMFS
Environmental Research Division
Southwest Fisheries Science Center
1352 Lighthouse Avenue
Pacific Grove, CA 93950-2097
e-mail: Roy.Mendelssohn@xxxxxxxx (Note new e-mail address)
voice: (831)-648-9029
fax: (831)-648-8440
www: http://www.pfeg.noaa.gov/
"Old age and treachery will overcome youth and skill."
"From those who have been given much, much will be expected"
