Hi, As an addition to this i'd like to add that if you are not explicitly increasing your permanent generation then I'm not surprised that many JSPs would fill it up. You will probably find that the default Maximum size of the Permanent generation is 64MB and it is that which is filling up and not the full 1850MB of your heap.
A tool you should look into is jvmstat which is available from sun and gives you a grahical representation of the heap real time so you can see what is running out. As a tip -XX:MaxPermSize=256M might be a good option for your JAVA_OPTS. Ta Matt -----Original Message----- From: Shapira, Yoav [mailto:[EMAIL PROTECTED] Sent: Friday, December 10, 2004 2:00 PM To: Tomcat Users List Subject: RE: Tomcat Running out of Memory Hi, >-Our consultant-designed website consists of approximately 5000 JSP >pages. None of these pages pull from a backend, the java was merely >used to provide a persistent border. Are these JSPs precompiled? >-Max heap size is set to 1850 megs, (which from what I understand is the >max on a 32-bit system). It's not. The max in JDK 1.4 is 2GB for the vast majority of 32-bit platforms, including yours. You'd have to search far and hard to find any platform that imposes a memory limit that's not a power of 2 ;) >-The server has 4 gigs of total RAM. Which doesn't matter because you're only giving the JVM 1850MB. >I've done some searches on Google and in the archives and I can't seem >to find any way to turn up the frequency of the garbage collection. To turn up the frequency of garbage collection, you would use several JVM options, as documented at http://java.sun.com/docs/hotspot/VMOptions.html. In fact, the related document at http://java.sun.com/docs/hotspot/gc1.4.2/index.html is vital reading. >Everything seems to indicate that once a JSP is loaded into memory it >stays there. Why wouldn't it? It's a compiled class that goes into the permanent generation (not the heap). Classes themselves (as opposed to their instances) would be unloaded only if possible and only at time of dire memory trouble, as judged by the VM. >Is there some way to increase the max heap size? Yes, using the -Xmx parameter. >Or some way to increase the frequency of garbage collection? Yes, see the VM options above. >Or any other way to slow down the memory usage? Yes, to critically inspect the design and implementation of your app such that less memory is used. This is typically a performance tradeoff, as you would cache and retain less in memory, leaving more in the database or disk as needed. If you're not precompiling your JSPs, you should: compiling 5000 JSPs is a significant drain on resources, although those resource should largely be released. See the note on javac's memory leak in Tomcat's release notes. Yoav Shapira http://www.yoavshapira.com This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
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