java using more than 300% CPU

Dear Team,

This week, we have been experiencing performance issues with our Zenoss Core 4.2.3 (Production).
We have more than 400 Nodes for monitoring, very sensitive information.

Below, are the server details :

Version : Zenoss Core 4.2.3 (VMware)
OS : Linux (x86_64) 2.6.32
Database : MySQL 5.5.28 (5.5.28)

System Load :

Cpu(s): 91.2%us, 4.8%sy, 0.4%ni, 2.5%id, 0.9%wa, 0.1%hi, 0.2%si, 0.0%st
Mem: 10129996k total, 9991592k used, 138404k free, 60380k buffers
Swap: 8208376k total, 2953348k used, 5255028k free, 6070304k cached
09:51:38 up 1 day, 22:18, 3 users, load average: 112.41, 126.38, 133.55

Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 8
On-line CPU(s) list: 0-7
Thread(s) per core: 1
Core(s) per socket: 2
Socket(s): 4

After some investigation, I found that this process is using more than 100 % cpu and memory.I don't know the reason why :

[zeno@zenoss5 ~]$ ps -eo pid,ppid,cmd,%mem,%cpu --sort=-%cpu | head
PID PPID CMD %MEM %CPU
3118 1 java -server -XX:+HeapDumpO 54.9 707
3312 1 /opt/zenoss/bin/python /opt 0.8 17.4
2127 2013 /usr/sbin/mysqld --basedir= 3.1 12.3

[zeno@zenoss5 ~]$ ps -ef | grep java
zenoss 3118 1 99 Feb15 13-16:03:45 java -server -XX:+HeapDumpOnOutOfMemoryError -DZENOSS_COMMAND=zeneventserver -DZENHOME=/opt/zenoss -Djetty.home=/opt/zenoss -Djetty.logs=/opt/zenoss/log -Dlogback.configurationFile=/opt/zenoss/etc/zeneventserver/logback.xml -DZENOSS_DAEMON=y -jar /opt/zenoss/lib/jetty-start-7.5.3.v20111011.jar --config=/opt/zenoss/etc/zeneventserver/jetty/start.config --ini=/opt/zenoss/etc/zeneventserver/jetty/jetty.ini --pre=etc/zeneventserver/jetty/jetty-logging.xml

For any other related information needed, please let me know.

Our Zenoss has been unresponsive for more than 3 days, so any kind of help would be really appreciated.

Best Regards,

E.