metrics

import jdk.internal.platform.Metrics;

public class Foo {
  static volatile long bah;
  public static void main(String [] args) {
  
  Metrics metrics = Metrics.systemMetrics();

  
  // com.sun.management.internal.OperatingSystemImpl
  com.sun.management.OperatingSystemMXBean bean = 
      (com.sun.management.OperatingSystemMXBean) java.lang.management.ManagementFactory.getOperatingSystemMXBean();
   

      while (bah < Integer.MAX_VALUE) {
	bah++;
      }

    System.out.println("getSystemLoadAverage " + bean.getSystemLoadAverage());
    System.out.println("getSystemCpuLoad " + bean.getProcessCpuTime());
    System.out.println("getCpuLoad " + bean.getCpuLoad());

    System.out.println("metrics.getCpuUsage " + metrics.getCpuUsage());
    System.out.println("metrics.getCpuUserUsage " + metrics.getCpuUserUsage());
    System.out.println("metrics.getCpuSystemUsage " + metrics.getCpuSystemUsage());
    System.out.println("metrics.getCpuPeriod " + metrics.getCpuPeriod());
    System.out.println("metrics.getCpuQuota " + metrics.getCpuQuota());
    System.out.println("metrics.getCpuShares " + metrics.getCpuShares());
    System.out.println("metrics.getCpuNumPeriods " + metrics.getCpuNumPeriods());
    System.out.println("metrics.getCpuNumThrottled " + metrics.getCpuNumThrottled());
    System.out.println("metrics.getCpuThrottledTime " + metrics.getCpuThrottledTime());
    System.out.println("metrics.getEffectiveCpuCount " + metrics.getEffectiveCpuCount());

  }
}

// getSystemLoadAverage is wrong, leaks host load
/*

root@e5c77df32f4f:/# javac Foo.java --add-exports=java.base/jdk.internal.platform=ALL-UNNAMED && java --add-exports=java.base/jdk.internal.platform=ALL-UNNAMED Foo

getSystemLoadAverage 0.91
getSystemCpuLoad 17970000000
getCpuLoad 0.3846918099051752
metrics.getCpuUsage 239357090682
metrics.getCpuUserUsage 24565
metrics.getCpuSystemUsage 744
metrics.getCpuPeriod 100000
metrics.getCpuQuota 50000
metrics.getCpuShares -1
metrics.getCpuNumPeriods 6222
metrics.getCpuNumThrottled 4654
metrics.getCpuThrottledTime 468037904487
metrics.getEffectiveCpuCount 1


getSystemLoadAverage 0.19
getSystemCpuLoad 20920000000
getCpuLoad 0.3919362471524164
metrics.getCpuUsage 263577126210 // Entire container life time, not just process
metrics.getCpuUserUsage 27105
metrics.getCpuSystemUsage 759
metrics.getCpuPeriod 100000
metrics.getCpuQuota 50000
metrics.getCpuShares -1
metrics.getCpuNumPeriods 6725
metrics.getCpuNumThrottled 5137
metrics.getCpuThrottledTime 502327690302
metrics.getEffectiveCpuCount 1


real	0m41.828s
user	0m20.905s
sys	0m0.042s


*/