cpu time to cpu_util

cpu time to cpu_util

So now you have:
    
    
    
    
 
     
The elapsed wall clock time (this period's time, minus last period's time) Call this X
 
     
The elapsed process cpu time (this period's time, minus last period's time) Call this Y
 
     
The number of CPUs. Call this C
 
    
The percent utilization will be Y / (X x C) * 100
import java.lang.management.*; 
import java.util.concurrent.*;  

osx = ManagementFactory.getOperatingSystemMXBean(); 
cores = osx.getAvailableProcessors();  // Factorial to keep the process busy so we can see some actual activity 
factorial = { n ->     int fact = 1;     int i = 1;     while(i <= n) {         i++;         fact *= i;     }     return fact; }   
long elapsedTime = -1, startTime = -1; long elapsedCpu = -1, startCpu = -1;;  
for(i in 0..20) {     startTime = System.nanoTime();     startCpu = osx.getProcessCpuTime();     CountDownLatch latch = new CountDownLatch(cores);     for(x in 1..cores) {         Thread.startDaemon() {             factorial(1000000);             latch.countDown();         }     }     latch.await();     elapsedTime = System.nanoTime()-startTime;     elapsedCpu = osx.getProcessCpuTime()-startCpu;     percUsage = (elapsedCpu / (elapsedTime* cores)) *100;     println "Percent Usage:$percUsage %"; }