[Joe Patton]

Hi All,

I have a quick web server question. Here is some high level info OTM setup:

Oracle 10.2.0.3
Red Hat Enterprise Linux 4
OTM 5.5 CU4 RU2
Intel hardware

The Web Server is on it's own box(2-CPU Core 2 Duo, 9GB RAM).

We recently had a problem with Tomcat 5.5 that prevented users from logging in:

javax.naming.NamingException: Lookup error: java.lang.OutOfMemoryError: unable to create new native thread; nested exception is:
INFO | jvm 1 | 2008/06/23 20:57:49 | java.lang.OutOfMemoryError: unable to create new native thread [Root exception is java.lang.OutOfMemoryError: unable to create new native thread]

The JVM heap size was not configured in the tomcat startup script. We added the following to the tomcat.sh script and restarted the web server processes:

#setting JVM heap size
CATALINA_OPTS="-Xms16m -Xmx512m"; export CATALINA_OPTS

Does anyone here have advice on configuring the JVM heap size for the servlet engine?

Thanks,

Joe Patton

[nick.polites]

Joe,

You shouldn't be modifying anything but the tomcat.conf file. There are two lines in there:

wrapper.java.additional.2=-Xms1025m
wrapper.java.additional.3=-Xmx1025m

which should be modified and both set to the same amount allocated. I have been able to bump up the JVM heap to 2400 and have it run stable at that setting. Your testing may vary on this but the bare mininum it needs to be set at is 1024, 1536 is really recommended but since you have 9 GB I would bump it to 2400 and drop it down if you have any problems.

Nick