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java 利用ManagementFactory获取jvm,os的一些信息_jre打印内存信息

作者：知新_RL | 2024-04-06 13:40:39

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jre打印内存信息

      想了解下某个java项目的运行时jvm的情况，可以使用一些监控工具，比如jdk的bin下就提供了很多工具。

  

比如，本地运行一个程序，让它死循环

 

  1. while(true){
  2. 			try {
  3. 				Thread.sleep(10*1000);
  4. 			} catch (Exception e) {
  5. 				
  6. 			}
  7. 		}


    然后，点击启动jconsole.exe

 

可以发现，jconsole.exe可以连接本地，也可以连接远程，我们选择本地的中的刚刚上面执行的那个类

我们发现，居然可以监控到这么多信息，那如果我们自己写代码，能否获取到这些信息呢，点击MBean。

java.lang下，看名称就知道是什么了，再点击某一个，会看到一些类信息，也就是说，我们是有可能自己写代码也能获取到jvm信息的。

    下面就记录下例子代码。

 

 

  1. package com.fei;
  2.  
  3. import java.lang.management.ClassLoadingMXBean;
  4. import java.lang.management.CompilationMXBean;
  5. import java.lang.management.GarbageCollectorMXBean;
  6. import java.lang.management.ManagementFactory;
  7. import java.lang.management.MemoryMXBean;
  8. import java.lang.management.MemoryManagerMXBean;
  9. import java.lang.management.MemoryPoolMXBean;
  10. import java.lang.management.MemoryUsage;
  11. import java.lang.management.OperatingSystemMXBean;
  12. import java.lang.management.RuntimeMXBean;
  13. import java.lang.management.ThreadInfo;
  14. import java.lang.management.ThreadMXBean;
  15. import java.lang.reflect.InvocationTargetException;
  16. import java.lang.reflect.Method;
  17. import java.util.Arrays;
  18. import java.util.List;
  19.  
  20. public class JvmInfo {
  21.  
  22. 	static final long MB = 1024 * 1024;
  23. 	
  24. 	public static void main(String[] args) {
  25. 		
  26. 				
  27. 		//打印系统信息
  28. 		System.out.println("===========打印系统信息==========");
  29. 		printOperatingSystemInfo();
  30. 		//打印编译信息
  31. 		System.out.println("===========打印编译信息==========");
  32. 		printCompilationInfo();
  33. 		//打印类加载信息
  34. 		System.out.println("===========打印类加载信息==========");
  35. 		printClassLoadingInfo();
  36. 		//打印运行时信息
  37. 		System.out.println("===========打印运行时信息==========");
  38. 		printRuntimeInfo();
  39. 		//打印内存管理器信息
  40. 		System.out.println("===========打印内存管理器信息==========");
  41. 		printMemoryManagerInfo();
  42. 		//打印垃圾回收信息
  43. 		System.out.println("===========打印垃圾回收信息==========");
  44. 		printGarbageCollectorInfo();
  45. 		//打印vm内存
  46. 		System.out.println("===========打印vm内存信息==========");
  47. 		printMemoryInfo();
  48. 		//打印vm各内存区信息
  49. 		System.out.println("===========打印vm各内存区信息==========");
  50. 		printMemoryPoolInfo();
  51. 		//打印线程信息
  52. 		System.out.println("===========打印线程==========");
  53. 		printThreadInfo();
  54. 		
  55. 	}
  56. 	
  57. 	
  58. 	private static void printOperatingSystemInfo(){
  59. 		OperatingSystemMXBean system = ManagementFactory.getOperatingSystemMXBean();
  60. 		//相当于System.getProperty("os.name").
  61. 		System.out.println("系统名称:"+system.getName());
  62. 		//相当于System.getProperty("os.version").
  63. 		System.out.println("系统版本:"+system.getVersion());
  64. 		//相当于System.getProperty("os.arch").
  65. 		System.out.println("操作系统的架构:"+system.getArch());
  66. 		//相当于 Runtime.availableProcessors()
  67. 		System.out.println("可用的内核数:"+system.getAvailableProcessors());
  68. 		
  69. 		if(isSunOsMBean(system)){
  70. 			long totalPhysicalMemory = getLongFromOperatingSystem(system,"getTotalPhysicalMemorySize");
  71. 			long freePhysicalMemory = getLongFromOperatingSystem(system, "getFreePhysicalMemorySize");
  72. 			long usedPhysicalMemorySize =totalPhysicalMemory - freePhysicalMemory;
  73. 			
  74. 			System.out.println("总物理内存(M):"+totalPhysicalMemory/MB);
  75. 			System.out.println("已用物理内存(M):"+usedPhysicalMemorySize/MB);
  76. 			System.out.println("剩余物理内存(M):"+freePhysicalMemory/MB);
  77. 			
  78. 			long  totalSwapSpaceSize = getLongFromOperatingSystem(system, "getTotalSwapSpaceSize");
  79. 			long freeSwapSpaceSize = getLongFromOperatingSystem(system, "getFreeSwapSpaceSize");
  80. 			long usedSwapSpaceSize = totalSwapSpaceSize - freeSwapSpaceSize;
  81. 			
  82. 			System.out.println("总交换空间(M):"+totalSwapSpaceSize/MB);
  83. 			System.out.println("已用交换空间(M):"+usedSwapSpaceSize/MB);
  84. 			System.out.println("剩余交换空间(M):"+freeSwapSpaceSize/MB);
  85. 		}
  86. 	}
  87. 	
  88. 	private static long getLongFromOperatingSystem(OperatingSystemMXBean operatingSystem, String methodName) {
  89. 		try {
  90. 			final Method method = operatingSystem.getClass().getMethod(methodName,
  91. 					(Class<?>[]) null);
  92. 			method.setAccessible(true);
  93. 			return (Long) method.invoke(operatingSystem, (Object[]) null);
  94. 		} catch (final InvocationTargetException e) {
  95. 			if (e.getCause() instanceof Error) {
  96. 				throw (Error) e.getCause();
  97. 			} else if (e.getCause() instanceof RuntimeException) {
  98. 				throw (RuntimeException) e.getCause();
  99. 			}
  100. 			throw new IllegalStateException(e.getCause());
  101. 		} catch (final NoSuchMethodException e) {
  102. 			throw new IllegalArgumentException(e);
  103. 		} catch (final IllegalAccessException e) {
  104. 			throw new IllegalStateException(e);
  105. 		}
  106. 	}
  107.  
  108. 	private static void printCompilationInfo(){
  109. 		CompilationMXBean compilation = ManagementFactory.getCompilationMXBean();
  110. 		System.out.println("JIT编译器名称："+compilation.getName());
  111. 		//判断jvm是否支持编译时间的监控
  112. 		if(compilation.isCompilationTimeMonitoringSupported()){
  113. 			System.out.println("总编译时间："+compilation.getTotalCompilationTime()+"秒");
  114. 		}
  115. 	}
  116. 	
  117. 	private static void printClassLoadingInfo(){
  118. 		ClassLoadingMXBean classLoad= ManagementFactory.getClassLoadingMXBean();
  119. 		System.out.println("已加载类总数："+classLoad.getTotalLoadedClassCount());
  120. 		System.out.println("已加载当前类："+classLoad.getLoadedClassCount());
  121. 		System.out.println("已卸载类总数："+classLoad.getUnloadedClassCount());
  122. 		
  123. 	}
  124. 	
  125. 	private static void printRuntimeInfo(){
  126. 		RuntimeMXBean runtime = ManagementFactory.getRuntimeMXBean();
  127. 		System.out.println("进程PID="+runtime.getName().split("@")[0]);
  128. 		System.out.println("jvm规范名称:"+runtime.getSpecName());
  129. 		System.out.println("jvm规范运营商:"+runtime.getSpecVendor());
  130. 		System.out.println("jvm规范版本:"+runtime.getSpecVersion());
  131. 		//返回虚拟机在毫秒内的开始时间。该方法返回了虚拟机启动时的近似时间
  132. 		System.out.println("jvm启动时间（毫秒）:"+runtime.getStartTime());
  133. 		//相当于System.getProperties
  134. 		System.out.println("获取System.properties:"+runtime.getSystemProperties());
  135. 		System.out.println("jvm正常运行时间（毫秒）:"+runtime.getUptime());
  136. 		//相当于System.getProperty("java.vm.name").
  137. 		System.out.println("jvm名称:"+runtime.getVmName());
  138. 		//相当于System.getProperty("java.vm.vendor").
  139. 		System.out.println("jvm运营商:"+runtime.getVmVendor());
  140. 		//相当于System.getProperty("java.vm.version").
  141. 		System.out.println("jvm实现版本:"+runtime.getVmVersion());
  142. 		List<String> args = runtime.getInputArguments();
  143. 		if(args != null && !args.isEmpty()){
  144. 			System.out.println("vm参数:");
  145. 			for(String arg : args){
  146. 				System.out.println(arg);
  147. 			}
  148. 		}
  149. 		System.out.println("类路径:"+runtime.getClassPath());
  150. 		System.out.println("引导类路径:"+runtime.getBootClassPath());
  151. 		System.out.println("库路径:"+runtime.getLibraryPath());
  152. 	}
  153. 	
  154. 	private static void printMemoryManagerInfo(){
  155. 		List<MemoryManagerMXBean> managers = ManagementFactory.getMemoryManagerMXBeans();
  156. 		if(managers != null && !managers.isEmpty()){
  157. 			for(MemoryManagerMXBean manager : managers){
  158. 				System.out.println("vm内存管理器：名称="+manager.getName()+",管理的内存区="
  159. 			+Arrays.deepToString(manager.getMemoryPoolNames())+",ObjectName="+manager.getObjectName());
  160. 			}
  161. 		}
  162. 	}
  163. 	
  164. 	private static void printGarbageCollectorInfo(){
  165. 		List<GarbageCollectorMXBean> garbages = ManagementFactory.getGarbageCollectorMXBeans();
  166. 		for(GarbageCollectorMXBean garbage : garbages){
  167. 			System.out.println("垃圾收集器：名称="+garbage.getName()+",收集="+garbage.getCollectionCount()+",总花费时间="
  168. 		+garbage.getCollectionTime()+",内存区名称="+Arrays.deepToString(garbage.getMemoryPoolNames()));
  169. 		}
  170. 	}
  171. 	
  172. 	private static void printMemoryInfo(){
  173. 		MemoryMXBean memory = ManagementFactory.getMemoryMXBean();
  174. 		MemoryUsage headMemory = memory.getHeapMemoryUsage();
  175. 		System.out.println("head堆:");
  176. 		System.out.println("\t初始(M):"+headMemory.getInit()/MB);
  177. 		System.out.println("\t最大(上限)(M):"+headMemory.getMax()/MB);
  178. 		System.out.println("\t当前(已使用)(M):"+headMemory.getUsed()/MB);
  179. 		System.out.println("\t提交的内存(已申请)(M):"+headMemory.getCommitted()/MB);
  180. 		System.out.println("\t使用率:"+headMemory.getUsed()*100/headMemory.getCommitted()+"%");
  181. 		
  182. 		System.out.println("non-head非堆:");
  183. 		MemoryUsage nonheadMemory = memory.getNonHeapMemoryUsage();
  184. 		System.out.println("\t初始(M):"+nonheadMemory.getInit()/MB);
  185. 		System.out.println("\t最大(上限)(M):"+nonheadMemory.getMax()/MB);
  186. 		System.out.println("\t当前(已使用)(M):"+nonheadMemory.getUsed()/MB);
  187. 		System.out.println("\t提交的内存(已申请)(M):"+nonheadMemory.getCommitted()/MB);
  188. 		System.out.println("\t使用率:"+nonheadMemory.getUsed()*100/nonheadMemory.getCommitted()+"%");
  189. 	}
  190. 	
  191. 	private static void printMemoryPoolInfo(){
  192. 		List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
  193. 		if(pools != null && !pools.isEmpty()){
  194. 			for(MemoryPoolMXBean pool : pools){
  195. 				//只打印一些各个内存区都有的属性，一些区的特殊属性，可看文档或百度
  196. 				//最大值，初始值，如果没有定义的话，返回-1，所以真正使用时，要注意
  197. 				System.out.println("vm内存区:\n\t名称="+pool.getName()+"\n\t所属内存管理者="+Arrays.deepToString(pool.getMemoryManagerNames())
  198. 						+"\n\t ObjectName="+pool.getObjectName()+"\n\t初始大小(M)="+pool.getUsage().getInit()/MB
  199. 						+"\n\t最大(上限)(M)="+pool.getUsage().getMax()/MB
  200. 						+"\n\t已用大小(M)="+pool.getUsage().getUsed()/MB
  201. 						+"\n\t已提交(已申请)(M)="+pool.getUsage().getCommitted()/MB
  202. 						+"\n\t使用率="+(pool.getUsage().getUsed()*100/pool.getUsage().getCommitted())+"%");
  203. 			
  204. 			}
  205. 		}
  206. 	}
  207. 	
  208. 	private static void printThreadInfo(){
  209. 		ThreadMXBean thread = ManagementFactory.getThreadMXBean();
  210. 		System.out.println("ObjectName="+thread.getObjectName());
  211. 		System.out.println("仍活动的线程总数="+thread.getThreadCount());
  212. 		System.out.println("峰值="+thread.getPeakThreadCount());
  213. 		System.out.println("线程总数（被创建并执行过的线程总数）="+thread.getTotalStartedThreadCount());
  214. 		System.out.println("当初仍活动的守护线程（daemonThread）总数="+thread.getDaemonThreadCount());
  215. 		
  216. 		//检查是否有死锁的线程存在
  217. 		long[] deadlockedIds =  thread.findDeadlockedThreads();
  218. 		if(deadlockedIds != null && deadlockedIds.length > 0){
  219. 			ThreadInfo[] deadlockInfos = thread.getThreadInfo(deadlockedIds);
  220. 			System.out.println("死锁线程信息:");
  221. 			System.out.println("\t\t线程名称\t\t状态\t\t");
  222. 			for(ThreadInfo deadlockInfo : deadlockInfos){
  223. 				System.out.println("\t\t"+deadlockInfo.getThreadName()+"\t\t"+deadlockInfo.getThreadState()
  224. 						+"\t\t"+deadlockInfo.getBlockedTime()+"\t\t"+deadlockInfo.getWaitedTime()
  225. 						+"\t\t"+deadlockInfo.getStackTrace().toString());
  226. 			}
  227. 		}
  228. 		long[] threadIds = thread.getAllThreadIds();
  229. 		if(threadIds != null && threadIds.length > 0){
  230. 			ThreadInfo[] threadInfos = thread.getThreadInfo(threadIds);
  231. 			System.out.println("所有线程信息:");
  232. 			System.out.println("\t\t线程名称\t\t\t\t\t状态\t\t\t\t\t线程id");
  233. 			for(ThreadInfo threadInfo : threadInfos){
  234. 				System.out.println("\t\t"+threadInfo.getThreadName()+"\t\t\t\t\t"+threadInfo.getThreadState()
  235. 						+"\t\t\t\t\t"+threadInfo.getThreadId());
  236. 			}
  237. 		}
  238. 		
  239. 	}
  240. 	
  241. 	private static boolean isSunOsMBean(OperatingSystemMXBean operatingSystem) {
  242. 		final String className = operatingSystem.getClass().getName();
  243. 		return "com.sun.management.OperatingSystem".equals(className)
  244. 				|| "com.sun.management.UnixOperatingSystem".equals(className)
  245.                 || "sun.management.OperatingSystemImpl".equals(className);
  246. 	}
  247. }

 

===========打印系统信息==========
系统名称:Windows 7
系统版本:6.1
操作系统的架构:amd64
可用的内核数:4
总物理内存(M):6041
已用物理内存(M):5387
剩余物理内存(M):653
总交换空间(M):18136
已用交换空间(M):15817
剩余交换空间(M):2319
===========打印编译信息==========
JIT编译器名称：HotSpot 64-Bit Tiered Compilers
总编译时间：0秒
===========打印类加载信息==========
已加载类总数：410
已加载当前类：410
已卸载类总数：0
===========打印运行时信息==========
进程PID=386220
jvm规范名称:Java Virtual Machine Specification
jvm规范运营商:Oracle Corporation
jvm规范版本:1.7
jvm启动时间（毫秒）:1447134405258
获取System.properties:{java.vm.version=24.80-b11, sun.jnu.encoding=GBK, java.vendor.url=http://java.oracle.com/, java.vm.info=mixed mode, user.dir=E:\test2\test200, sun.cpu.isalist=amd64, java.awt.graphicsenv=sun.awt.Win32GraphicsEnvironment, sun.os.patch.level=Service Pack 1, java.io.tmpdir=C:\Users\WEIJIA~1\AppData\Local\Temp\, user.home=E:\USER\weijianfei, java.awt.printerjob=sun.awt.windows.WPrinterJob, java.version=1.7.0_80, file.encoding.pkg=sun.io, java.vendor.url.bug=http://bugreport.sun.com/bugreport/, file.encoding=UTF-8, line.separator=
, sun.java.command=com.fei.JvmInfo, java.vm.specification.vendor=Oracle Corporation, java.vm.vendor=Oracle Corporation, java.class.path=E:\test2\test200\target\classes;E:\setup\maven\org\apache\zookeeper\zookeeper\3.4.6\zookeeper-3.4.6.jar;E:\setup\maven\org\slf4j\slf4j-api\1.6.1\slf4j-api-1.6.1.jar;E:\setup\maven\org\slf4j\slf4j-log4j12\1.6.1\slf4j-log4j12-1.6.1.jar;E:\setup\maven\log4j\log4j\1.2.16\log4j-1.2.16.jar;E:\setup\maven\jline\jline\0.9.94\jline-0.9.94.jar;E:\setup\maven\junit\junit\3.8.1\junit-3.8.1.jar;E:\setup\maven\io\netty\netty\3.7.0.Final\netty-3.7.0.Final.jar;E:\setup\maven\org\springframework\spring-webmvc\4.2.1.RELEASE\spring-webmvc-4.2.1.RELEASE.jar;E:\setup\maven\org\springframework\spring-beans\4.2.1.RELEASE\spring-beans-4.2.1.RELEASE.jar;E:\setup\maven\org\springframework\spring-context\4.2.1.RELEASE\spring-context-4.2.1.RELEASE.jar;E:\setup\maven\org\springframework\spring-aop\4.2.1.RELEASE\spring-aop-4.2.1.RELEASE.jar;E:\setup\maven\aopalliance\aopalliance\1.0\aopalliance-1.0.jar;E:\setup\maven\org\springframework\spring-core\4.2.1.RELEASE\spring-core-4.2.1.RELEASE.jar;E:\setup\maven\commons-logging\commons-logging\1.2\commons-logging-1.2.jar;E:\setup\maven\org\springframework\spring-expression\4.2.1.RELEASE\spring-expression-4.2.1.RELEASE.jar;E:\setup\maven\org\springframework\spring-web\4.2.1.RELEASE\spring-web-4.2.1.RELEASE.jar, sun.io.unicode.encoding=UnicodeLittle, user.variant=, os.arch=amd64, user.name=weijianfei, user.language=zh, java.runtime.version=1.7.0_80-b15, sun.boot.class.path=D:\jre1.7\lib\resources.jar;D:\jre1.7\lib\rt.jar;D:\jre1.7\lib\sunrsasign.jar;D:\jre1.7\lib\jsse.jar;D:\jre1.7\lib\jce.jar;D:\jre1.7\lib\charsets.jar;D:\jre1.7\lib\jfr.jar;D:\jre1.7\classes, sun.desktop=windows, sun.cpu.endian=little, awt.toolkit=sun.awt.windows.WToolkit, sun.boot.library.path=D:\jre1.7\bin, java.vm.name=Java HotSpot(TM) 64-Bit Server VM, java.home=D:\jre1.7, java.endorsed.dirs=D:\jre1.7\lib\endorsed, sun.management.compiler=HotSpot 64-Bit Tiered Compilers, java.runtime.name=Java(TM) SE Runtime Environment, java.library.path=D:\jre1.7\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Java\jdk1.6.0_45\bin;C:\Program Files\Java\jdk1.6.0_45\jre\bin;D:\soft\svn1.8\bin;D:\apache-maven-3.2.3\bin;D:\mysql5.7\MySQL Server 5.7\bin;D:\mysql5.7\MySQL Utilities 1.3.5\;D:\mongoDB;., file.separator=\, java.specification.vendor=Oracle Corporation, java.vm.specification.version=1.7, sun.java.launcher=SUN_STANDARD, user.timezone=, os.name=Windows 7, path.separator=;, java.ext.dirs=D:\jre1.7\lib\ext;C:\Windows\Sun\Java\lib\ext, sun.arch.data.model=64, java.specification.name=Java Platform API Specification, os.version=6.1, user.script=, user.country=CN, java.class.version=51.0, java.vendor=Oracle Corporation, java.vm.specification.name=Java Virtual Machine Specification, java.specification.version=1.7}
jvm正常运行时间（毫秒）:573
jvm名称:Java HotSpot(TM) 64-Bit Server VM
jvm运营商:Oracle Corporation
jvm实现版本:24.80-b11
vm参数:
-Dfile.encoding=UTF-8
类路径:E:\test2\test200\target\classes;E:\setup\maven\org\apache\zookeeper\zookeeper\3.4.6\zookeeper-3.4.6.jar;E:\setup\maven\org\slf4j\slf4j-api\1.6.1\slf4j-api-1.6.1.jar;E:\setup\maven\org\slf4j\slf4j-log4j12\1.6.1\slf4j-log4j12-1.6.1.jar;E:\setup\maven\log4j\log4j\1.2.16\log4j-1.2.16.jar;E:\setup\maven\jline\jline\0.9.94\jline-0.9.94.jar;E:\setup\maven\junit\junit\3.8.1\junit-3.8.1.jar;E:\setup\maven\io\netty\netty\3.7.0.Final\netty-3.7.0.Final.jar;E:\setup\maven\org\springframework\spring-webmvc\4.2.1.RELEASE\spring-webmvc-4.2.1.RELEASE.jar;E:\setup\maven\org\springframework\spring-beans\4.2.1.RELEASE\spring-beans-4.2.1.RELEASE.jar;E:\setup\maven\org\springframework\spring-context\4.2.1.RELEASE\spring-context-4.2.1.RELEASE.jar;E:\setup\maven\org\springframework\spring-aop\4.2.1.RELEASE\spring-aop-4.2.1.RELEASE.jar;E:\setup\maven\aopalliance\aopalliance\1.0\aopalliance-1.0.jar;E:\setup\maven\org\springframework\spring-core\4.2.1.RELEASE\spring-core-4.2.1.RELEASE.jar;E:\setup\maven\commons-logging\commons-logging\1.2\commons-logging-1.2.jar;E:\setup\maven\org\springframework\spring-expression\4.2.1.RELEASE\spring-expression-4.2.1.RELEASE.jar;E:\setup\maven\org\springframework\spring-web\4.2.1.RELEASE\spring-web-4.2.1.RELEASE.jar
引导类路径:D:\jre1.7\lib\resources.jar;D:\jre1.7\lib\rt.jar;D:\jre1.7\lib\sunrsasign.jar;D:\jre1.7\lib\jsse.jar;D:\jre1.7\lib\jce.jar;D:\jre1.7\lib\charsets.jar;D:\jre1.7\lib\jfr.jar;D:\jre1.7\classes
库路径:D:\jre1.7\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Java\jdk1.6.0_45\bin;C:\Program Files\Java\jdk1.6.0_45\jre\bin;D:\soft\svn1.8\bin;D:\apache-maven-3.2.3\bin;D:\mysql5.7\MySQL Server 5.7\bin;D:\mysql5.7\MySQL Utilities 1.3.5\;D:\mongoDB;.
===========打印内存管理器信息==========
vm内存管理器：名称=CodeCacheManager,管理的内存区=[Code Cache],ObjectName=java.lang:type=MemoryManager,name=CodeCacheManager
vm内存管理器：名称=PS Scavenge,管理的内存区=[PS Eden Space, PS Survivor Space],ObjectName=java.lang:type=GarbageCollector,name=PS Scavenge
vm内存管理器：名称=PS MarkSweep,管理的内存区=[PS Eden Space, PS Survivor Space, PS Old Gen, PS Perm Gen],ObjectName=java.lang:type=GarbageCollector,name=PS MarkSweep
===========打印垃圾回收信息==========
垃圾收集器：名称=PS Scavenge,收集=0,总花费时间=0,内存区名称=[PS Eden Space, PS Survivor Space]
垃圾收集器：名称=PS MarkSweep,收集=0,总花费时间=0,内存区名称=[PS Eden Space, PS Survivor Space, PS Old Gen, PS Perm Gen]
===========打印vm内存信息==========
head堆:
	初始(M):94
	最大(上限)(M):1344
	当前(已使用)(M):1
	提交的内存(已申请)(M):91
	使用率:1%
non-head非堆:
	初始(M):23
	最大(上限)(M):130
	当前(已使用)(M):3
	提交的内存(已申请)(M):23
	使用率:13%
===========打印vm各内存区信息==========
vm内存区:
	名称=Code Cache
	所属内存管理者=[CodeCacheManager]
	 ObjectName=java.lang:type=MemoryPool,name=Code Cache
	初始大小(M)=2
	最大(上限)(M)=48
	已用大小(M)=0
	已提交(已申请)(M)=2
	使用率=15%
vm内存区:
	名称=PS Eden Space
	所属内存管理者=[PS MarkSweep, PS Scavenge]
	 ObjectName=java.lang:type=MemoryPool,name=PS Eden Space
	初始大小(M)=24
	最大(上限)(M)=497
	已用大小(M)=1
	已提交(已申请)(M)=24
	使用率=6%
vm内存区:
	名称=PS Survivor Space
	所属内存管理者=[PS MarkSweep, PS Scavenge]
	 ObjectName=java.lang:type=MemoryPool,name=PS Survivor Space
	初始大小(M)=3
	最大(上限)(M)=3
	已用大小(M)=0
	已提交(已申请)(M)=3
	使用率=0%
vm内存区:
	名称=PS Old Gen
	所属内存管理者=[PS MarkSweep]
	 ObjectName=java.lang:type=MemoryPool,name=PS Old Gen
	初始大小(M)=63
	最大(上限)(M)=1008
	已用大小(M)=0
	已提交(已申请)(M)=63
	使用率=0%
vm内存区:
	名称=PS Perm Gen
	所属内存管理者=[PS MarkSweep]
	 ObjectName=java.lang:type=MemoryPool,name=PS Perm Gen
	初始大小(M)=21
	最大(上限)(M)=82
	已用大小(M)=2
	已提交(已申请)(M)=21
	使用率=13%
===========打印线程==========
ObjectName=java.lang:type=Threading
仍活动的线程总数=5
峰值=5
线程总数（被创建并执行过的线程总数）=5
当初仍活动的守护线程（daemonThread）总数=4
所有线程信息:
		线程名称					状态					线程id
		Attach Listener					RUNNABLE					5
		Signal Dispatcher					RUNNABLE					4
		Finalizer					WAITING					3
		Reference Handler					WAITING					2
		main					RUNNABLE					1

 

 

 

 

 

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