Hi Tim There are limitations imposed by h/w and os, and one should be careful about the implications of addressing large amount of memory. There is an interesting thread about this topic on the server side: http://www.theserverside.com/discussions/thread.tss?thread_id=26347#124481
There is also a link on sun about tuning gc, it is definitely worth reading prior making any setting on the JVM. http://java.sun.com/docs/hotspot/gc1.4.2/ Free tools exists to profile the JVM and Memory management, available from java.net. Hope this helps. Bruno Georges Glencore International AG Tel. +41 41 709 3204 Fax +41 41 709 3000 |---------+---------------------------> | | Tim Funk | | | <[EMAIL PROTECTED]| | | org> | | | | | | 05.12.05 13:18 | | | Please respond | | | to "Tomcat Users| | | List" | | | | |---------+---------------------------> >-----------------------------------------------------------------------------------------------------------------------------------------------| | | | To: Tomcat Users List <users@tomcat.apache.org> | | cc: | | Subject: Re: memory limit for tomcat? | | | |Distribute: | |Personal? |-------| | | | [ ] x | | | |-------| | | | >-----------------------------------------------------------------------------------------------------------------------------------------------| Not really. A JVM implementation could queue the extra heap memory to a swap disk just like an OS can. But the performance tradeoffs are so bad - that writing such a jvm would be a bad idea. ;) -Tim Bruno Georges wrote: > Hi Tim > Correct me if I am wrong, but there is a limit of 2GB in a 32bits > architecture . > With Best Regards > Bruno Georges > > Glencore International AG > Tel. +41 41 709 3204 > Fax +41 41 709 3000 > > > ----- Original Message ----- > From: Tim Funk [EMAIL PROTECTED] > Sent: 05.12.2005 12:48 > To: Tomcat Users List <users@tomcat.apache.org> > Subject: Re: memory limit for tomcat? > > The JVM heap can be as large as you want it. But its up to existing > implementations on how well the gc implementation is and do you need > that much heap. > > That being said - if your tomcat application runs fine under the current > memory limits - you are not adding more webapps (or or memory hogging > items) to it - there is no need to increase the heap. Let the OS use > that memory for other resources. Once the JVM grabs the memory - its > taken an isn't given back. (Unless newer jvms have become smarter to > shrink the heap on demand) > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] LEGAL DISCLAIMER. The contents of this e-mail and any attachments are strictly confidential and they may not be used or disclosed by someone who is not a named recipient. If you have received this email in error please notify the sender by replying to this email inserting the word "misdirected" as the message and delete this e-mail from your system. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
