package test1;
import java.lang.management.CompilationMXBean;
import java.lang.management.GarbageCollectorMXBean;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;
import java.lang.management.MemoryPoolMXBean;
import java.lang.management.MemoryUsage;
import java.lang.management.OperatingSystemMXBean;
import java.lang.management.RuntimeMXBean;
import java.lang.management.ThreadMXBean;
import java.util.List;
public class Test11 {
/**
* @param args
*/
public static void main(String[] args) {
//==========================Memory=========================
System.out.println("==========================Memory=========================");
MemoryMXBean memoryMBean = ManagementFactory.getMemoryMXBean();
MemoryUsage usage = memoryMBean.getHeapMemoryUsage();
System.out.println("初始化 Heap: " + (usage.getInit()/1024/1024) + "mb");
System.out.println("最大Heap: " + (usage.getMax()/1024/1024) + "mb");
System.out.println("已经使用Heap: " + (usage.getUsed()/1024/1024) + "mb");
System.out.println("Heap Memory Usage: " + memoryMBean.getHeapMemoryUsage());
System.out.println("Non-Heap Memory Usage: " + memoryMBean.getNonHeapMemoryUsage());
//==========================Runtime=========================
System.out.println("==========================Runtime=========================");
RuntimeMXBean runtimeMBean = ManagementFactory.getRuntimeMXBean();
System.out.println("JVM name : " + runtimeMBean.getVmName());
System.out.println("lib path : " + runtimeMBean.getLibraryPath());
System.out.println("class path : " + runtimeMBean.getClassPath());
System.out.println("getVmVersion() " + runtimeMBean.getVmVersion());
//java options
List<String> argList = runtimeMBean.getInputArguments();
for(String arg : argList){
System.out.println("arg : " + arg);
}
//==========================OperatingSystem=========================
System.out.println("==========================OperatingSystem=========================");
OperatingSystemMXBean osMBean = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
//获取操作系统相关信息
System.out.println("getName() "+ osMBean.getName());
System.out.println("getVersion() " + osMBean.getVersion());
System.out.println("getArch() "+osMBean.getArch());
System.out.println("getAvailableProcessors() " + osMBean.getAvailableProcessors());
//==========================Thread=========================
System.out.println("==========================Thread=========================");
//获取各个线程的各种状态,CPU 占用情况,以及整个系统中的线程状况
ThreadMXBean threadMBean=(ThreadMXBean)ManagementFactory.getThreadMXBean();
System.out.println("getThreadCount() " + threadMBean.getThreadCount());
System.out.println("getPeakThreadCount() " + threadMBean.getPeakThreadCount());
System.out.println("getCurrentThreadCpuTime() " + threadMBean.getCurrentThreadCpuTime());
System.out.println("getDaemonThreadCount() " + threadMBean.getDaemonThreadCount());
System.out.println("getCurrentThreadUserTime() "+ threadMBean.getCurrentThreadUserTime());
//==========================Compilation=========================
System.out.println("==========================Compilation=========================");
CompilationMXBean compilMBean=(CompilationMXBean)ManagementFactory.getCompilationMXBean();
System.out.println("getName() " + compilMBean.getName());
System.out.println("getTotalCompilationTime() " + compilMBean.getTotalCompilationTime());
//==========================MemoryPool=========================
System.out.println("==========================MemoryPool=========================");
//获取多个内存池的使用情况
List<MemoryPoolMXBean> mpMBeanList= ManagementFactory.getMemoryPoolMXBeans();
for(MemoryPoolMXBean mpMBean : mpMBeanList){
System.out.println("getUsage() " + mpMBean.getUsage());
System.out.println("getMemoryManagerNames() "+ mpMBean.getMemoryManagerNames().toString());
}
//==========================GarbageCollector=========================
System.out.println("==========================GarbageCollector=========================");
//获取GC的次数以及花费时间之类的信息
List<GarbageCollectorMXBean> gcMBeanList=ManagementFactory.getGarbageCollectorMXBeans();
for(GarbageCollectorMXBean gcMBean : gcMBeanList){
System.out.println("getName() " + gcMBean.getName());
System.out.println("getMemoryPoolNames() "+ gcMBean.getMemoryPoolNames());
}
//==========================Other=========================
System.out.println("==========================Other=========================");
//Java 虚拟机中的内存总量,以字节为单位
int total = (int)Runtime.getRuntime().totalMemory()/1024/1024;
System.out.println("内存总量 :" + total + "mb");
int free = (int)Runtime.getRuntime().freeMemory()/1024/1024;
System.out.println("空闲内存量 : " + free + "mb");
int max = (int) (Runtime.getRuntime().maxMemory() /1024 / 1024);
System.out.println("最大内存量 : " + max + "mb");
}
}