What's "too many classes" ? I have JConsole running, and I see that across my 8 apps on one server, 14,000 classes are loaded. Heap usage is around 1GB.With the settings below, I am not seeing PermGen errors as of yet, although it's too early to tell, I will have to let the app run for 24 hours. JAVA_OPTS="$JAVA_OPTS -Djava.awt.headless=true -Dfile.encoding=UTF-8 -server -Xms1024m -Xmx3012m -XX:NewSize=512m -XX:MaxNewSize=1024m -XX:PermSize=512m -XX:MaxPermSize=1024m"
On Wed, Sep 16, 2009 at 10:44 AM, Jeffrey Janner < jeffrey.jan...@polydyne.com> wrote: > Charles - > My other post didn't make it back yet. > Now I'm getting confused, because the same doc I referenced below, which > treats Heap and PermGen separately in Appendix B, says this in Chapter > 3: > "The detail message PermGen space indicates that the permanent > generation is full. The permanent generation is the area of the heap > where class and method objects are stored. If an application loads a > very large number of classes, then the size of the permanent generation > might need to be increased using the -XX:MaxPermSize option." > http://java.sun.com/javase/6/webnotes/trouble/TSG-VM/html/memleaks.html > That is specifically about the error Bruce is seeing. > But, yes, it appears he's loading too many classes, or reloading them, > or something. > Something else Bruce can look into is if his apps are using common jar > files that can be loaded into Shared space. > Jeff > > -----Original Message----- > From: Jeffrey Janner [mailto:jeffrey.jan...@polydyne.com] > Sent: Wednesday, September 16, 2009 9:31 AM > To: Tomcat Users List > Subject: RE: java.lang.OutOfMemoryError: PermGen space > > Chuck - > I couldn't tell from the post if the Architecture line meant hardware, > OS, or JVM. And I'm under the impression from multiple re-reads of the > Java tuning docs that ALL generations are drawn from the heap, including > PermGen. > Yes, using Jconsole or better is what he needs to do. > > Bruce- > Here is another good read. Direct from Sun: > http://java.sun.com/javase/6/webnotes/trouble/TSG-VM/html/tools.html > Jeff > > > -----Original Message----- > From: Caldarale, Charles R [mailto:chuck.caldar...@unisys.com] > Sent: Wednesday, September 16, 2009 9:04 AM > To: Tomcat Users List > Subject: RE: java.lang.OutOfMemoryError: PermGen space > > > From: Jeffrey Janner [mailto:jeffrey.jan...@polydyne.com] > > Subject: RE: java.lang.OutOfMemoryError: PermGen space > > > > You don't say if the JVM is 32-bit or 64-bit > > Actually, he did: > > > Architecture: amd64 > > JVM Version: 1.6.0_16-b01 > > JVM Vendor: Sun Microsystems Inc. > > The architecture would be x86 for a 32-bit JVM on Intel/AMD. > > > 1) By splitting the Heap in half between NewGen and PermGen > > This is not correct. The -Xmx size does not include the PermGen size. > > Again, use JConsole or equivalent to verify that the requested heap > sizes are being used. > > - Chuck > > > THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY > MATERIAL and is thus for use only by the intended recipient. If you > received this in error, please contact the sender and delete the e-mail > and its attachments from all computers. > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > > > > ******************************* NOTICE > ********************************* > This message is intended for the use of the individual or entity to > which > it is addressed and may contain information that is privileged, > confidential, and exempt from disclosure under applicable law. If the > reader of this message is not the intended recipient or the employee or > agent responsible for delivering this message to the intended recipient, > > you are hereby notified that any dissemination, distribution, or copying > > of this communication is strictly prohibited. If you have received this > > communication in error, please notify us immediately by reply or by > telephone (call us collect at 512-343-9100) and immediately delete this > message and all its attachments. > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > > > > ******************************* NOTICE ********************************* > This message is intended for the use of the individual or entity to which > it is addressed and may contain information that is privileged, > confidential, and exempt from disclosure under applicable law. If the > reader of this message is not the intended recipient or the employee or > agent responsible for delivering this message to the intended recipient, > you are hereby notified that any dissemination, distribution, or copying > of this communication is strictly prohibited. If you have received this > communication in error, please notify us immediately by reply or by > telephone (call us collect at 512-343-9100) and immediately delete this > message and all its attachments. > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > >
