OperatingSystemMXBean to get system performance metrics

OperatingSystemMXBeanGet system performance metrics

方法名称	含义	单位
getFreePhysicalMemorySize	可用物理内存	字节
getTotalPhysicalMemorySize	总物理内存	字节
getFreeSwapSpaceSize	可用交换空间	字节
getTotalSwapSpaceSize	交换空间总量	字节
getCommittedVirtualMemorySize	Committed virtual memory size	字节
getProcessCpuLoad	进程CPU使用率（0~1之间）
getSystemCpuLoad	系统CPU使用率（0~1之间）
getAvailableProcessors	可用CPU核数	个
getProcessCpuTime	进程使用的 CPU 时间	纳秒

import com.sun.management.OperatingSystemMXBean;
import java.lang.management.ManagementFactory;

public class Test {
    
    public static void main(String[] args) throws InterruptedException {
    
        final long GB = 1024 * 1024 * 1024;
        OperatingSystemMXBean operatingSystemMXBean = (OperatingSystemMXBean)ManagementFactory.getOperatingSystemMXBean();
        System.out.println("进程CPU使用率： "+operatingSystemMXBean.getProcessCpuLoad()* 100+"%");
        System.out.println("系统CPU使用率： "+operatingSystemMXBean.getSystemCpuLoad()* 100+"%");
        System.out.println("物理内存总量： "+operatingSystemMXBean.getTotalPhysicalMemorySize()/GB+"GB");
        System.out.println("The remaining available amount of physical memory： "+operatingSystemMXBean.getFreePhysicalMemorySize()/GB+"GB");
        System.out.println("内存使用率： "+(double)100*operatingSystemMXBean.getFreePhysicalMemorySize()/operatingSystemMXBean.getTotalPhysicalMemorySize()+"%");
        System.out.println("交换空间总量： "+operatingSystemMXBean.getTotalSwapSpaceSize()/GB+"GB");
        System.out.println("The amount of swap space remaining available： "+operatingSystemMXBean.getFreeSwapSpaceSize()/GB+"GB");
        System.out.println("CPU核心数： "+operatingSystemMXBean.getAvailableProcessors()+"个");
        System.out.println("Amount of virtual memory committed： "+operatingSystemMXBean.getCommittedVirtualMemorySize());
        System.out.println("process usedCPU时间： "+operatingSystemMXBean.getProcessCpuTime()/1000000000.0+"秒");
    }
}