Our sites have just went down for a couple of minutes. I solved the problem by restarting Tomcat. At the time of the crash, java.exe was about 345MB. I'm running tomcat with the -Xms128m -Xmx256m options. Our server has 1GB physical ram.

On the Tomcat logs, it reads:

2004-02-27 16:58:55 ApplicationDispatcher[/jsp-apps] Servlet.service() for servlet jsp threw exception
java.lang.OutOfMemoryError


2004-02-27 16:58:55 StandardWrapperValve[jsp]: Servlet.service() for servlet jsp threw exception
java.lang.OutOfMemoryError


Do you have any idea why this might have happened? Also, how can we avoid such problems in the future?

Asim Alp
Educational Networks
55 Broad Street, 10th Floor
New York, NY 10004
www.educationalnetworks.net

Tel: +1 (212) 269-0200
Fax: +1 (212) 269-1446
On Feb 27, 2004, at 11:39 AM, Kannan Sundararajan wrote:

Yes, it goes along with subject called Garbage collection and tuning. This
area is a huge, sometimes very quick to tune, and sometimes gives a
nightmare to tune those properties. The nature of this subject grows based
on your application, servers and expectations from user end.


-----Original Message-----
From: Asim Alp [mailto:[EMAIL PROTECTED]
Sent: Friday, February 27, 2004 11:25 AM
To: [EMAIL PROTECTED]
Subject: Tomcat heap vs. java.exe


I have a quick question. When I run Tomcat 5.0.18, my java.exe starts with ~65MB. Then as my websites get hits, java.exe starts increasing. I run tomcat with the -Xms128m -Xmx256m options. So the startup heap size of tomcat is 128MB. After my first start, I usually have around 80 MB free memory for Tomcat.

My question is, why is the startup java.exe size is smaller than my
total heap size?  Does the size of java.exe grow as the heap starts
being used.  I would expect java.exe to be at least 128 MB (plus the
JVM memory) since that is how much is allocated.

Thanks,

Asim


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