查看本机JVM可设置的最大内存

最近在为项目调优JVM，今天闲来无事，在JE上查看了下有什么命令是可以查看本机，本JVM可支持的最大堆内存，不小心看到了，顺便实验了下

C:\Documents and Settings\Administrator>java -Xmx1024m -version
java version "1.5.0_16"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_16-b02)
Java HotSpot(TM) Client VM (build 1.5.0_16-b02, mixed mode)

C:\Documents and Settings\Administrator>java -Xmx1200m -version
java version "1.5.0_16"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_16-b02)
Java HotSpot(TM) Client VM (build 1.5.0_16-b02, mixed mode)

C:\Documents and Settings\Administrator>java -Xmx1400m -version
java version "1.5.0_16"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_16-b02)
Java HotSpot(TM) Client VM (build 1.5.0_16-b02, mixed mode)

C:\Documents and Settings\Administrator>java -Xmx1500m -version
Error occurred during initialization of VM
Could not reserve enough space for object heap
Could not create the Java virtual machine.

C:\Documents and Settings\Administrator>java -Xmx1450m -version
Error occurred during initialization of VM
Could not reserve enough space for object heap
Could not create the Java virtual machine.

C:\Documents and Settings\Administrator>java -Xmx1440m -version
java version "1.5.0_16"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_16-b02)
Java HotSpot(TM) Client VM (build 1.5.0_16-b02, mixed mode)

C:\Documents and Settings\Administrator>java -Xmx1445m -version
Error occurred during initialization of VM
Could not reserve enough space for object heap
Could not create the Java virtual machine.

C:\Documents and Settings\Administrator>java -Xmx1442m -version
java version "1.5.0_16"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_16-b02)
Java HotSpot(TM) Client VM (build 1.5.0_16-b02, mixed mode)

C:\Documents and Settings\Administrator>java -Xmx1444m -version
java version "1.5.0_16"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_16-b02)
Java HotSpot(TM) Client VM (build 1.5.0_16-b02, mixed mode)

C:\Documents and Settings\Administrator>java -Xmx1444m -version