How to determine CPU usage using Java?????

[JavaEmpires]

Hi all,

I want to do a CPU monitoring program and for that I need the CPU usage per second.
How do i determine the CPU usage using Java ???
Please give any suggestions as to how to go about this???
OS i am using is Linux.

Thanks in advance

[roots]

Profiling CPU usage from within a Java application - Java World

google:java cpu usage

[Deathbob]

There is a way using pure java. It may take some adapting to fit your needs. The monitoring could be placed on it's own thread and have a handle to the thread you wish to monitor.

cpuperc in this case holds the aprox. cpu usage %. It is fairly accurate. You could average several to get a better idea.

Code:

//import java.lang.management.*;

ThreadMXBean TMB = ManagementFactory.getThreadMXBean();
long time = new Date().getTime() * 1000000;
long cput = 0;
double cpuperc = -1;

//Begin loop.

if( TMB.isThreadCpuTimeSupported() )
{
    	if(new Date().getTime() * 1000000 - time > 1000000000) //Reset once per second
    	{
    		time = new Date().getTime() * 1000000;
    		cput = TMB.getCurrentThreadCpuTime();
    	}
    				
    	if(!TMB.isThreadCpuTimeEnabled())
    	{
    		TMB.setThreadCpuTimeEnabled(true);
    	}
    				
    	if(new Date().getTime() * 1000000 - time != 0)
    		cpuperc = (TMB.getCurrentThreadCpuTime() - cput) / (new Date().getTime() * 1000000.0 - time) * 100.0;  				
}
else
{
    cpuperc = -2;
}

//Do cpu intensive stuff

//End Loop