CPU Usage is at 100%+ and server lags immensely

A day or so ago I restarted the server, and when it came back up, there was immense lag..I checked htop and CPU usage was at 98%, and continued to rise.

I have monsters/mobs disabled...BUT I can spawn them with /spawnmob for some reason.

I am using Java 1.7, and start the server with:

Code:

#! /bin/sh
BINDIR="$(dirname "$(readlink -fn "$0")")"
cd "$BINDIR"
java -server -Xmn4G -Xms8G -Xmx14G -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX$

Any ideas?

 

The mob server.properties is just to turn off auto spawn.
Hope you are running x64 OS and the x64 version of JDK 1.7.0.,otherwise you can't benefit from such a large amount of RAM.
Which OS are you running? Are you using a RAMdisk?
Tweaking java - http://www.minecraftforum.net/viewtopic.php?f=1012&t=68128

 

Yes, 64bit CentOS. No RAM disk, but i'll try it out.