Using OperatingSystemMXBean to get CPU usage

Question

I\'m trying to use Java to get the percentage of CPU used by the currently running Java Virtual Machine. My research has pointed me to using the com.sun.management.Ope

Answer 1

Just answering my own question in case it could help somebody.

What I was doing was technically correct, however I was not giving the OperatingSystemMXBean enough time to gather CPU usage information. The JVM must actually be running for a few seconds before it can gather CPU usage information, and then the refresh resolution is implementation-dependent it would seem.

Running the code with the following change will start to produce usage information after ~2 seconds on my machine:

public static void main(String[] args) {
    OperatingSystemMXBean bean = (com.sun.management.OperatingSystemMXBean) ManagementFactory
            .getOperatingSystemMXBean();

    while (true) {
        System.out.println(bean.getProcessCpuLoad());
        System.out.println(bean.getSystemCpuLoad());
    }

}

Hopefully this can help somebody