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From "Anand Narasimhan" <ana...@cisco.com>
Subject RE: Memory problems with Tomcat 4.1.27
Date Tue, 01 Jun 2004 18:26:51 GMT
Hi,

Thanks for your reply. I tried running tomcat inside OptimizeIt memory
profiler. But Optmizeit seems to be adding more load to the tomcat
process. Optimizeit indicates that the heap usage is well within the
limits. But the overall memory keeps increasing. 

Right now we cannot upgrade the JDK, tomcat or struts because our
customers are using the product and we have to support the existing
version. But we are planning on upgrading for the future releases.

Anand

>-----Original Message-----
>From: Shapira, Yoav [mailto:Yoav.Shapira@mpi.com] 
>Sent: Tuesday, June 01, 2004 6:18 AM
>To: Tomcat Users List
>Subject: RE: Memory problems with Tomcat 4.1.27
>
>
>
>Hi,
>You can check the Sun site and places like 
>javaperformancetuning.com for papers on heap versus overall 
>app memory.  This has also been addressed several times on 
>this list, so an archive search might prove interesting.
>
>You might have a memory leak: run inside a profiler to see if 
>there are allocated objects still referenced that should be 
>deallocated.  If you have a leak, the GC will run and run 
>(longer and longer as your heap grows), but won't be able to 
>collect anything, resulting in the behavior you describe.
>
>If you can upgrade your JDK, tomcat, and struts versions you 
>will be in better shape at least as far as receiving support, 
>but also for debugging.
>
>Yoav Shapira
>Millennium Research Informatics
>
>
>>-----Original Message-----
>>From: Anand Narasimhan [mailto:anandn@cisco.com]
>>Sent: Friday, May 28, 2004 3:02 PM
>>To: 'Tomcat Users List'
>>Cc: 'Anand Narasimhan'
>>Subject: Memory problems with Tomcat 4.1.27
>>
>>Hi,
>>
>>I am trying to debug a memory consumption issue with an 
>application. I 
>>would appreciate any help I can get.
>>
>>The application I am debugging is a web application written 
>using j2sdk 
>>1.4.1_02 and struts 1.0.2. The tomcat version I am using is 4.1.27.
>>The backend has a relational database (sybase/oracle) and the database
>>access
>>is through JDBC. The tomcat server is running on Solaris 2.8. The max
>>heap size
>>for the JVM (using -Xmx) is set to 512M. I tried increasing 
>it to 1024M
>>as
>>well.
>>
>>The problem is under reasonably large load, the overall 
>process size of 
>>tomcat (reported by top) keeps increasing and eventually tomcat stops
>>responding. I
>>tried running tomcat with OptimizeIt hoping to find out if there are
>any
>>leaks.
>>When running with OptimizeIt the memory consumption increases much 
>>faster than when running without OptimizeIt. At this point OptimizeIt 
>>reports that about
>>300M of heap is being used. But the overall process size is 
>about 900M.
>>
>>I tried turing on the -Xloggc option. The output of -Xloggc 
>also shows 
>>that the heap size is well withing the limits. In some cases towards 
>>the end of the
>>GC log, I noticed that each GC cycle takes about 17 - 20 secs.
>>
>>Any suggestions regarding how to proceed debugging this problem would
>be
>>
>>greatly appreciated. Are there any docs or any white papers 
>that would 
>>help understand the relation between the heap and the overall process
>memory?
>>
>>Thanks
>>Anand
>>
>>
>>______________________________________________________________
>_________
>_
>>
>>Anand Narasimhan
>>anandn@cisco.com
>>
>
>
>
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