Hi, Go to http://localhost:8080/manager/status and take a look.
Yoav Shapira Millennium Research Informatics >-----Original Message----- >From: David Muller [mailto:[EMAIL PROTECTED] >Sent: Wednesday, June 09, 2004 2:27 PM >To: Tomcat Users List >Cc: [EMAIL PROTECTED] >Subject: RE: Memory Settings On Tomcat > >Peter, >Do you have more specifics on this? > >"...TC5 has the new status servlet, which will tell you how much heap is >actually in use currently." > >I've been using the /manager and jmxpoxy app URL's but I can't find >anything which has heap info in it. What am I missing? > >/manager/list >/manager/serverinfo >/manager/jmxproxy >etc. > >http://jakarta.apache.org/tomcat/tomcat-5.0-doc/manager-howto.html > >Thanks, >-Dave > > > >-----Original Message----- >From: Peter Lin [mailto:[EMAIL PROTECTED] >Sent: Wednesday, June 09, 2004 8:12 AM >To: Tomcat Users List >Subject: Re: Memory Settings On Tomcat > >if you can upgrade to tomcat5, I would recommend it. the reason I >suggest this is TC5 has the new status servlet, which will tell you how >much heap is actually in use currently. > > >the JVM will not release memory back to the OS that is true. in terms of >performance the biggest indicator of poor performance is the rate at >which the heap grows and the frequency of full GC. > > >Applications that are well behaved should result in regular intervals of >full GC. Poor performing applications wiill cause erratic and frequent >full GC. Even if you can't upgrade to TC5, it might be worth it to d/l >and install it. Once you have it installed, you can use JMeter to view >the server load and the memory usage pattern. > >I hope that helps. > >peter > > > >Michael Duffy <[EMAIL PROTECTED]> wrote:I recently had a problem with a >Windoze server hanging >up due to memory problems. > >I've got Tomcat 4.1.29 installed to run as a service >under JDK 1.4.1_05 on this Windows 2000 server. The >Tomcat memory settings on startup are -Xms64m and >-Xmx1024m. The server has 512MB of physical RAM >installed. The Windoze task manager says Tomcat is >sitting at ~128MB of memory. > >My understanding is that Java's garbage collection >will reclaim heap-allocated memory to the JVM, but not >necessarily to the OS. Is this true? What this means >is that a Windoze server admin could look at the task >manager and see a large memory usage for Tomcat, but >that doesn't necessarily reflect Tomcat's current >usage. > >It's more like a high water mark on a pier: it'll show >the highest value that Tomcat has used, but the real >value will be lower if the garbage collector runs and >the tide goes out. If you read a lot of objects into >session you could end up with a big high water mark. > >The application is a JSP front end with a single >controller servlet that interacts with an Oracle >database. The only data members in the servlet are >some read-only map that are initialized on startup. >There are some session data that are maintained for >certain user requests, but the rest are all stateless >request/response. > >The server admin is saying that the problem is Windoze >memory management. When a new process starts up >outside of Tomcat, it could be that memory isn't >reachable, and the new process hangs. > >We're going to increase the virtual page size on >Windoze and change the startup settings for the Tomcat >service to -Xms256m and -Xmx1536m. > >So my questions are: > >(1) Is my understanding of the interaction between the >JVM and OS memory management correct? >(2) Are there any other tuning settings for Tomcat >that I need to look at? > >Thanks - % > > > > > >__________________________________ >Do you Yahoo!? >Friends. Fun. Try the all-new Yahoo! Messenger. >http://messenger.yahoo.com/ > >--------------------------------------------------------------------- >To unsubscribe, e-mail: [EMAIL PROTECTED] >For additional commands, e-mail: [EMAIL PROTECTED] > > > >--------------------------------- >Do you Yahoo!? >Friends. Fun. Try the all-new Yahoo! Messenger > > >--------------------------------------------------------------------- >To unsubscribe, e-mail: [EMAIL PROTECTED] >For additional commands, e-mail: [EMAIL PROTECTED] 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]
