Thanks for the response Robert.
Is it abnormal to see the mem usage % for tomcat to go as high as 80 or
90%? Currently its only at 11%, but I am wondering at what point I
should start panicking. :)
Robert Harper wrote:
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>
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