Tomcat 4.0.1 performance on HP-UX 11.11

[Karthik Dathathri]

Hello All,
We are currently performing load test on one of our Web application which runs under Tomcat 4.0.1 and Apache 1.3.26.It uses
Cocoon(for XSL transformations)which also
runs under Tomcat context.
The details of the relevant software installed on system are as below:
O.S : HP-UX 11.11
Java Version : 1.3.1.05a.00
Java Out-of-Box : 1.0.00.01

The details of the no.of cpu/memory
configuration of the system are as below:
No.of processors : 2 each 440 MHz
Physical Memory : 1 GB
Hard disk Capacity : 4 GB

The options used for JVM in catalina.sh(Tomcat launcher configuration script)are as
follows:
-Xmn512m
-XX:PermSize=32m
-XX:-UseHighResolutionTimer
-XX:+ForceMmapReserved
-XdoCloseWithReadPending
-ms650m
-mx650m
We used top command to get a view of resources(cpu/memory)consumption.Below is the snapshot of top output for Tomcat JVM's process.

CPU :5
TTY :pts/tb
PID :2878
USERNAME:root
PRI:152
NI :20
SIZE:26684K
RES :386M
STATE:run
TIME :107:44
%WCPU:2.26
%CPU :2.25
COMMAND:java

We mostly used to see more memory consumption and CPU usage by Tomcat's JVM process.Does anybody faced a similar kind of
problem earlier?
Actually I checked the man page of 'top'
command to interpret the output.But there is no
clear documentation.Could someone kindly explain me how to interpret the metrics above and what they mean?
I also have used glance sometime.There also lot of metrics are generated.I understand we can set filters for them.But no good documentation/report generating facility for them.
I checked the internet(websites,newsgroups) for some pointers as well ITRC after which only I am posting my
query.
If you need further information to help
me kindly let me know

Thanks for your time.
Karthik