JMX를 통해서 cpu 정보 구하기

jmx를 이용하여 해당 jvm instance의 cpu usage를 측정하는 메소드는 다음과 같이 되어 있다.

private void _getJavaRuntime() {

OperatingSystemMXBean osbean = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();

RuntimeMXBean runbean = (RuntimeMXBean) ManagementFactory.getRuntimeMXBean();

long bfprocesstime = osbean.getProcessCpuTime();

long bfuptime = runbean.getUptime();

long ncpus = osbean.getAvailableProcessors();

for (int i = 0; i < 1000000; ++i) {

ncpus = osbean.getAvailableProcessors();

}

long afprocesstime = osbean.getProcessCpuTime();

long afuptime = runbean.getUptime();

float cal = (afprocesstime - bfprocesstime)

/ ((afuptime - bfuptime) * 10000f);

javacpu = Math.min(99f, cal);

uptime = runbean.getUptime(); 

}