The memory should peak at some point and the go up and down with need. There are a few things you have to be aware of though. The garbage collector is a very low priority thread so if your server never has a dull moment, you end up exhausting memory just because the garbage collector does not get a chance to run.
Care in development should be taken with respect to use of objects and having circular references. You can cause memory leaks with circular references because you might leave free and object from the servlet but then have two objects referring to each other and the GC will not see them as having gone out of scope. Another thing to think about is if you are doing a lot of string concatenation the StringBuffer object is much better to use than the String object. StringBuffer will be easier on memory and more efficient. Robert S. Harper Information Access Technology, Inc. -----Original Message----- From: Rizwan Merchant [mailto:[EMAIL PROTECTED] Sent: Tuesday, October 03, 2006 7:41 AM To: tomcat Subject: tomcat memory usage questions Hi, We recently developed and deployed a web based application using the following technologies... Struts Spring Hibernate 3.0 Mysql 5.0 tomcat 5.5 Linux Fedora Core 4 After the system went live, I have been monitoring the CPU and memory usages. I dread the outOfMemory errors and am a little paranoid about it. There are 2 main processes I am monitoring, tomcat and mysqld. The tomcat process memory usage is slowly creeping up...after 8 hours of application usage it is at 13.3% and the mysqld memory usage is at 1.3%. I am wondering what kind of pattern I should be observing for the memory usages. Should it go up and then down again (like the CPU usage)? Or is it ok for it to slowly go up (the way it is doing right now)? The swap memory is not being used, so I am guessing thats a good thing. Also, someone told me that hibernate and spring will try and cache everything it can, which could be the cause of the memory creeping up slowly. Is this true? and if it is, will this be a problem when the memory gets to a high number like 80 or 90% ? Also, is there a way to tell if there are any processes spawned by tomcat that are hanging around uselessly? Any help, ideas, tips would be appreciated. I am just concerned about having any memory issues with this LIVE application. Thanks, -Riz. <http://forum.springframework.org/newreply.php?do=newreply&p=79473> --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
