在java代码中获取JVM参数

近日关注性能调优，关注JMX，发现java.lang.management.*之强大。同时查阅了资料，整合一版关于JVM参数获取的note，仅供参考：

 

 
	MemoryMXBean memorymbean = ManagementFactory.getMemoryMXBean(); 
	MemoryUsage usage = memorymbean.getHeapMemoryUsage(); 
	System.out.println("INIT HEAP: " + usage.getInit()); 
	System.out.println("MAX HEAP: " + usage.getMax()); 
	System.out.println("USE HEAP: " + usage.getUsed()); 
	System.out.println("\nFull Information:"); 
	System.out.println("Heap Memory Usage: " 
	+ memorymbean.getHeapMemoryUsage()); 
	System.out.println("Non-Heap Memory Usage: " 
	+ memorymbean.getNonHeapMemoryUsage()); 
	
	List<String> inputArguments = ManagementFactory.getRuntimeMXBean().getInputArguments(); 
	System.out.println("===================java options=============== ");
	System.out.println(inputArguments);

	
	
	System.out.println("=======================通过java来获取相关系统状态============================ ");
	int i = (int)Runtime.getRuntime().totalMemory()/1024;//Java 虚拟机中的内存总量,以字节为单位
	System.out.println("总的内存量 i is "+i);
	int j = (int)Runtime.getRuntime().freeMemory()/1024;//Java 虚拟机中的空闲内存量
	System.out.println("空闲内存量 j is "+j);
	System.out.println("最大内存量 is "+Runtime.getRuntime().maxMemory()/1024);

	System.out.println("=======================OperatingSystemMXBean============================ ");
	OperatingSystemMXBean osm = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
//    System.out.println(osm.getFreeSwapSpaceSize()/1024);
//    System.out.println(osm.getFreePhysicalMemorySize()/1024);
//    System.out.println(osm.getTotalPhysicalMemorySize()/1024);
    
    //获取操作系统相关信息
    System.out.println("osm.getArch() "+osm.getArch());
    System.out.println("osm.getAvailableProcessors() "+osm.getAvailableProcessors());
    //System.out.println("osm.getCommittedVirtualMemorySize() "+osm.getCommittedVirtualMemorySize());
    System.out.println("osm.getName() "+osm.getName());
    //System.out.println("osm.getProcessCpuTime() "+osm.getProcessCpuTime());
    System.out.println("osm.getVersion() "+osm.getVersion());
    //获取整个虚拟机内存使用情况
    System.out.println("=======================MemoryMXBean============================ ");
    MemoryMXBean mm=(MemoryMXBean)ManagementFactory.getMemoryMXBean();
    System.out.println("getHeapMemoryUsage "+mm.getHeapMemoryUsage());
    System.out.println("getNonHeapMemoryUsage "+mm.getNonHeapMemoryUsage());
    //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
    System.out.println("=======================ThreadMXBean============================ ");
    ThreadMXBean tm=(ThreadMXBean)ManagementFactory.getThreadMXBean();
    System.out.println("getThreadCount "+tm.getThreadCount());
    System.out.println("getPeakThreadCount "+tm.getPeakThreadCount());
    System.out.println("getCurrentThreadCpuTime "+tm.getCurrentThreadCpuTime());
    System.out.println("getDaemonThreadCount "+tm.getDaemonThreadCount());
    System.out.println("getCurrentThreadUserTime "+tm.getCurrentThreadUserTime());
    
    //当前编译器情况
    System.out.println("=======================CompilationMXBean============================ ");
    CompilationMXBean gm=(CompilationMXBean)ManagementFactory.getCompilationMXBean();
    System.out.println("getName "+gm.getName());
    System.out.println("getTotalCompilationTime "+gm.getTotalCompilationTime());
    
    //获取多个内存池的使用情况
    System.out.println("=======================MemoryPoolMXBean============================ ");
    List<MemoryPoolMXBean> mpmList=ManagementFactory.getMemoryPoolMXBeans();
    for(MemoryPoolMXBean mpm:mpmList){
	    System.out.println("getUsage "+mpm.getUsage());
	    System.out.println("getMemoryManagerNames "+mpm.getMemoryManagerNames().toString());
    }
    //获取GC的次数以及花费时间之类的信息
    System.out.println("=======================MemoryPoolMXBean============================ ");
    List<GarbageCollectorMXBean> gcmList=ManagementFactory.getGarbageCollectorMXBeans();
    for(GarbageCollectorMXBean gcm:gcmList){
	    System.out.println("getName "+gcm.getName());
	    System.out.println("getMemoryPoolNames "+gcm.getMemoryPoolNames());
    }
    //获取运行时信息
    System.out.println("=======================RuntimeMXBean============================ ");
    RuntimeMXBean rmb=(RuntimeMXBean)ManagementFactory.getRuntimeMXBean();
    System.out.println("getClassPath "+rmb.getClassPath());
    System.out.println("getLibraryPath "+rmb.getLibraryPath());
    System.out.println("getVmVersion "+rmb.getVmVersion());
	

 

运行结果如下：

INIT HEAP: 268435456
MAX HEAP: 1065484288
USE HEAP: 331632

Full Information:
Heap Memory Usage: init = 268435456(262144K) used = 331632(323K) committed = 266403840(260160K) max = 1065484288(1040512K)
Non-Heap Memory Usage: init = 134381568(131232K) used = 2607888(2546K) committed = 134709248(131552K) max = 570425344(557056K)
==========java options===== 
[-Xms256m, -Xmx1024m, -XX:PermSize=128M, -XX:MaxPermSize=512m, -Dfile.encoding=UTF-8]
=======================通过java来获取相关系统状态============================ 
总的内存量 i is 260160
空闲内存量 j is 259836
最大内存量 is 1040512
=======================OperatingSystemMXBean============================ 
osm.getArch() x86
osm.getAvailableProcessors() 2
osm.getName() Windows 7
osm.getVersion() 6.1
=======================MemoryMXBean============================ 
getHeapMemoryUsage init = 268435456(262144K) used = 331632(323K) committed = 266403840(260160K) max = 1065484288(1040512K)
getNonHeapMemoryUsage init = 134381568(131232K) used = 2638064(2576K) committed = 134709248(131552K) max = 570425344(557056K)
=======================ThreadMXBean============================ 
getThreadCount 5
getPeakThreadCount 5
getCurrentThreadCpuTime 93600600
getDaemonThreadCount 4
getCurrentThreadUserTime 31200200
=======================CompilationMXBean============================ 
getName HotSpot Client Compiler
getTotalCompilationTime 1
=======================MemoryPoolMXBean============================ 
getUsage init = 163840(160K) used = 473920(462K) committed = 491520(480K) max = 33554432(32768K)
getMemoryManagerNames [Ljava.lang.String;@15b7986
getUsage init = 16580608(16192K) used = 331632(323K) committed = 16580608(16192K) max = 66060288(64512K)
getMemoryManagerNames [Ljava.lang.String;@1d9dc39
getUsage init = 2031616(1984K) used = 0(0K) committed = 2031616(1984K) max = 8257536(8064K)
getMemoryManagerNames [Ljava.lang.String;@93dcd
getUsage init = 247791616(241984K) used = 0(0K) committed = 247791616(241984K) max = 991166464(967936K)
getMemoryManagerNames [Ljava.lang.String;@b89838
getUsage init = 134217728(131072K) used = 2213312(2161K) committed = 134217728(131072K) max = 536870912(524288K)
getMemoryManagerNames [Ljava.lang.String;@111a3ac
=======================MemoryPoolMXBean============================ 
getName Copy
getMemoryPoolNames [Ljava.lang.String;@110b053
getName MarkSweepCompact
getMemoryPoolNames [Ljava.lang.String;@a83b8a
=======================RuntimeMXBean============================ 
getClassPath E:\workspaces\mss-workspace\Jmx\bin;E:\workspaces\mss-workspace\Jmx\lib\jmxtools.jar
getLibraryPath C:\Program Files (x86)\Java\jre6\bin;.;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:/Program Files (x86)/Java/jre6/bin/client;C:/Program Files (x86)/Java/jre6/bin;d:\oracle\product\10.2.0\client_2\bin;d:\oracle\product\10.2.0\client_1;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static;C:\SWTOOLS\ReadyApps;C:\Program Files\TortoiseSVN\bin;C:\Program Files (x86)\Java\jdk1.6.0_14\bin;C:\Program Files (x86)\Java\jdk1.6.0_14\jre\bin;
getVmVersion 14.0-b16